6x100W TDA7498 Class-D Amplifier Board

Brand:| Model: AA-AB34181
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This amplifier board uses three Class-D TDA7498s to generate up to 100W x 6-channels, making it the perfect 5.1 amplifier solution.
  • 6 x 100W Class-D amplifier
  • Small footprint for space limited applications
  • Perfect amplifier board for DIY 5.1 amplification
  • Built-in cooling fan and over-temp protection circuit
  • 14 to 39 VDC power supply required
Part # 
Weight: 1.35 lbs.  
List Price$69.99
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Buy 4-up$56.81
Part # 320-307
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Product Details

6x100W TDA7498 Class-D Amplifier Board

Build your own high-power 5.1 amplifier with this 6-channel amplifier board. Three Class-D TDA7498s are used for extreme efficiency. The small 3.6" wide by 4.8" long footprint allows this amplifier board to be used in many applications were size constraints limit the use of conventional amplifiers. Additionally, separate inputs and outputs make this amplifier board perfect for tri-amplifier use. Just add a 14 to 39 VDC power supply (or an AC voltage source with the addition of this rectifier board), signal source, and speakers!

A low noise cooling fan is mounted atop the robust heatsink to maximize heat dissipation. Thermal, over/under voltage, and current protection circuits are also included to extend the longevity of the amplifier board. Four fixed gain settings are available to allow for volume control at the source, and dual stereo RCA line-level inputs are pre-attached. Mounting holes are provided as is a 2.1 mm x 5.5 mm power jack for quick connection. Screw-down phoenix-type terminals are included for quick speaker wire connection.

• Three Class-D TDA7498 amplifier ICs
• Heatsink with attached fan
• Pre-drilled mounting holes
• Over-temperature, over/under voltage, and over current protection circuits
• Phoenix-type speaker terminals
• Six line-level RCA inputs

• Power output (w/ 36 VDC power supply): 100W x 6 (6 ohms, THD 10%), 80W x 6 (8 ohms, THD 10%), 78W x 6 (6 ohms, THD 1%)
• Frequency response: 22 to 22,000 Hz
• Minimum impedance: 4 ohms
• Recommended power supply: 14 to 39 VDC, 18A regulated
• Fixed gain settings: 25.6 dB, 31.6 dB, 35.1 dB, 37.6 dB
• Power input jack: 2.1 x 5.5 mm, center-positive
• Dimensions: 6" L x 4.5" W x 1.4" H

6x100W TDA7498 Class-D Amplifier Board
  • BrandParts Express
  • ModelAA-AB34181
  • Part Number320-307
  • UPC844632096716
  • Product CategoryAudio Amplifier Boards & Modules
  • Unit of MeasureEA
  • Product Rating
    (7 Reviews)
  • Weight1.35 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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6x100W TDA7498 Class-D Amplifier Board
6x100W TDA7498 Class-D Amplifier Board is rated 4.1429 out of 5 by 7.
Rated 5 out of 5 by from franken-stereobought the board to build a tri-amped setupquality: average... RCA suck...speaker connections weak.. small footprint though...Power Supply: i used a 36V 20A digikey power supply... was going to try two or three modded computer power supplies but I heard issues will come up if outputs are not isolated.. decided to be safeFeatures: gain is only adjustable in 5 step increments with DIP switches... in three pairs... no individual channel gain... no soft off.. will thump your speakers.. I wired in a tweeter disconnect to protect them.Operation: this system rocks... better performance than name brand bi--tube-amped setup in living room... better clarity, better highs, bright without shrill, rich mids, powerfull lows with no boom..overall: $60, 6CH, 600W.... cant go wrongsidenote speakers are all parts-express... 8" woofer, sealed back 4" mid, dome tweeter.input stage includes, dbx stereo 3way crossover, dbx EQ (not needed but I love tunablilty)
Date published: 2013-02-20

Product Q&A

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6x100W TDA7498 Class-D Amplifier Board

what maximum gain setting with a 350W 36V power supply?

The amplifier has 4 levels of signal gain per channel (25.6 dB, 31.6 dB, 35.1 dB, 37.6 dB), I'm no expert, does it mean it can output a corresponding maximum power of 6W, 25W, 56W and 100W per channel?If that calculus ir correct, I can safely use the 35.1 dB medium gain on each channel (giving a maximum power of 56W x6 = 336W) with a 36V 350W power supply?
Asked by: crespo80
The gain settings have no effect on the maximum power per channel. The maximum power per channel is solely affected by the voltage of the power supply (and the current capabilities of the power supply, to some extent). As stated in the specs, you will get 100W with 6 ohm speakers when using a 36V supply. If you increase the power supply's voltage to the amp's maximum input voltage of 39V then you will get slightly more power, or if you use speakers with a lower impedance (that is, 4 ohms) then you will also get more power. However you won't get much more power because the TDA7498 chips that this amp uses have an aggressive current-limiting feature that will instantly turn off the amp for a few tenths of a second if the limit is exceeded.As mentioned, the current capabilities of the power supply will also affect the power output of the amp to some extent. For example, if you use a 36V power supply that is capable of supplying about 150W continuously, then you should have no problem getting 100W into a 6 ohm speaker on ONLY one channel. However if you try using all 6 channels with this power supply then you will not get 100W on each channel because the power supply will not be able to supply enough current.All that the 4 gain settings on this amp do is change how much the input signal is amplified. So, they are basically a volume control with 4 settings. They are there so that this amp can be used with a variety of sources, ranging from sources that output an audio signal that is very quiet to sources with very strong outputs. You will get the same power output from this amp no matter what gain setting you use. However, if you use a device with a weak output, and set the amp's gain to its lowest setting then you won't actually make use of the amp's maximum output because you aren't providing enough gain. Also, if you use the maximum gain setting when using a source with a very strong output (such as a good mixer) then this will not affect the maximum power output of the amp. It will only cause the amp to clip at a lower volume level because it is being amplified so much by the gain setting.In regards to your power supply selection, it should work no problem. When it comes to class-D amplifiers, such as these ones that Parts Express sells or virtually any other class-D amp out there, as a general rule you can use a power supply that is capable of putting out about half as much power as the maximum power level of the amp. So, this is a 600W amp, which means that a 300W power supply should be fine. This is because typical music is very dynamic: it has lots of quiet sections, and it will only occasionally cause the amplifier to output its maximum power. The only way to make an amplifier continuously output its maximum power is to feed a pure sine wave through it at full volume. Most people rarely do this (it's mainly only done for testing), and if it is done then virtually no-one sends pure sine waves through ALL 6 channels at the same time at full volume.
Answered by: eboyer
Date published: 2014-11-28

Lion 36v battery pack.

How about using a 36v lion pack from a power tool? I'm trying to figure the cost/performance ratio. How long would a 2 a/h battery last? Would it vary according to how hard you run the amp and how many channels you used? The requirement of 18amp supply just represents sustained peak , but in an efficient class d amp how often would it need this value?
Asked by: Cod65
Yes, this will work. As you say, how long this will work depends very heavily on how loud you play it, and how many channels are drawing power. The 18 amp draw would come about if all channels were drawing close to 100 watts.36VDC * 18 A = 648 Watts648 W * 90% efficiency = 583.2 W583.2 W / 6 channels = 97.2 W per channelThis level sustained would sound bad due to 10% THD. You are much more likely to run into hard bass notes which very briefly need to draw that much amperage. Thus, the difficulty in saying how long it will last. If you were drawing the full 18 amps (648 watts) constantly, your battery would last 6 minutes an 40 seconds, in a perfect world. If you were drawing 1 amp constantly (36 watts) it would last about 2 hours. If you are listening at moderate volume, it would be somewhere in between. Either way, this battery is not a great way to power a 6 channel amp.If you really want to do this and need it to be portable and all 6 channels to play really loud get three 12 volt sealed lead-acid "gel cell" batteries. Wire them in series to get 36 voltsIf you don't need need all those channels, go with a 4 or 2 channel amp that doesn't require as much voltage. With the 4 channel amp you could use the same SLA "gel cell" idea with only 2 batteries. Gel cells can be found that are rated at up to 100 Ah.
Answered by: Travis Rysdam
Date published: 2014-08-12

12 Channel DIY amp and power supply.

I am trying to build a 12 channel amp as a cheaper option to the Dayton Audio MA1240a. Sure recommends to use 36V DC 9.7A 349.2W MEAN WELL Power Supply(S-350-36) for this board (seems under powered) but I will likely use two SE-450-36. How would this setup compare to the Dayton Audio MA1240a?
Asked by: DycesKynes
There is no reason it will not work, the only differences I can see would be the lack of flexibility without the individual gain controls and bus inputs.
Answered by: MattP
Date published: 2013-06-11

What is spec with 4ohms speakers?

One of speaker will be 4 phmsX2 subwoofer. I wonder it will be (100W+)x2 or not.
Asked by: Shoon
Unfortunately this amplifier is not rated for a 4 ohm load, only as low as 6 will be safe.
Answered by: MattP
Date published: 2014-11-28

Can I use 2ch for one subwoofer?

I am getting Bravox PXW12D-4 12" DVC Subwoofer 4 Ohm Per Coil.So I thought I could feed 1ch per a coil. Would it work?
Asked by: Shoon
Yes you can use one channel on each coil of a DVC woofer.
Answered by: MattP
Date published: 2014-08-12

Can I build a distribution amplifier to use with the 6x100W TDA7498 Class-D Amplifier Board?

I have already asked this Q. a couple of months ago, and thanks to those how replied, but so far I did not get anywhere. I got couple of factory made distribution amplifiers – with 9 and 24 stereo outs, but due to my space limitation (the whole think is going to be located in a kitchen cabinet, which is only 16 inches wide), I could not use them. I can disassemble one of them, take out the board and use it but for number of reasons I prefer to build my own, if possible.Here is my original Q: I have total 9 pairs of speakers and planning to buy 3 of these amplifiers - (6 X 100W Class D Audio Amplifiers TDA7498), It is going to be 3 pairs of speakers for each amp. How can I connect all three amplifiers to one sours of signal (or music)? Do I need something else in between of my preamp and the power amps? ThanksI did some digging on the Internet and found an audio distribution amplifier’s schematic TL084. It has one in and three outs. The following is the comments of the original 3 channel distribution amplifier:The three channel output distribution amplifier uses a single TL084. The first stage is capacitively coupled with a 1.0 μF electrolytic capacitor. The inputs are at 1/2 VCC rail or 4.5 V. This makes it possible to use a single 9 V supply. A voltage gain of 10 (1 M ohm/100 k ohm) is obtained in the first stage, and the other three stages are connected as unity-gain voltage followers. Each output stage independently drives an amplifier through the 50 μF output capacitor to the 5.1 k ohm load resistor. The response is flat from 10 Hz to 30 kHz.Here is my Q: Since a TL084 has four separate independent operational amplifiers can I add to the original schematic two more TL084s (or another eight secondary stages) to extend the number of outs from three to eleven?The music signal comes out of CD, Radio, TV or computer. Then goes through 1.0 μF electrolytic capacitor to the first stage. Then the original schematic splits to three secondary stages but I want to add another eight secondary stages and split it to total of 11 (eleven) secondary stages. For stereo signal I would need two of this schematics. Can someone tell if it is going to work or not? Thanks.
Asked by: andreyambalov
What you're proposing should work fine. You could have virtually unlimited outputs without having any problems. The 1st-stage TL084 (the one with the gain of 10 V/V) would be completely capable of that, and the audio source that you use would have no effect on the outcome.However, one thing you should change in the schematic is the gain. A gain of 10 V/V is very high (it is 20 dB), and will cause all sorts of problems: the 1st-stage op-amp might oscillate out of control with certain audio inputs, playing anything at moderate to high volumes on your source will cause the audio signal to clip in the op-amps, the volume control that you use will be touchy, and it will create a lot of noise. I'd suggest setting the gain to something much lower than 10 V/V. You can change the gain by changing the value of the 1 Mohm resistor: gain = 1 + R/100k, where R is the value of the resistor that is currently 1 Mohm. I would suggest not making R less than about 20 k (ie, a gain of 1.2), and not more than 200 k (ie, a gain of 3), unless for some reason you really need a lot of gain.Another note: the TL084 is generally considered to be a budget op-amp. Not everyone will notice it, but its audio output quality isn't really the greatest. For a step up in performance (and a slight step up in price), I'd suggest the NE5532, a mid-quality op-amp that lots of people usually recommend. There are of course even better op-amps out there, but not many people will notice the difference between them and the NE5532, especially if anything else in the stereo is not of the utmost premium quality.
Answered by: eboyer
Date published: 2013-03-20

How much static noise on the outputs is to be expected?

I got the amp all hooked up and got sound out of it, but before I started to experiment with it I noticed there was a good amount of static noise coming from all 5 speakers (only using 5 ch). So I power down everything, disconnect the source and power back up, still there. Power supply? So I replace the PS with 3 batteries I had around. Still there. It doesn't knock you over, but in a quiet room, the volume down, it sounds like one of those white noise machines. Am I wrong in thinking if I have nothing connected to the input RCAs I should get near silence out? Anyway to clean it up? I was actually hoping it was PS noise, but you can't get much cleaner than 3 large batteries.
Asked by: philco
Possible original hook-up problems caused some damage. Once damage happens the effect cam continue after the cause is cleared. Contact PE for help and/or replacement.
Answered by: Nitnub
Date published: 2013-03-05

How can I connect three amplifiers to one sours of signal (or music)? I mean the 6 X 100W Class D Audio Amplifiers TDA7498

I have total 9 pairs of speakers and planning to buy 3 of this amplifiers - (6 X 100W Class D Audio Amplifiers TDA7498), It is going to be 3 pairs of speakers for each amp. How can I connect all three amplifiers to one sours of signal (or music)? Do I need something else in between of my preamp and the power amps? Thanks
Asked by: andreyambalov
You need something to split a stereo signal into 9 stereo signals. This can be achieved with a number of products. Depending on the impedance of your source and the type of connector what equipment you need varies. The input impedance of these amps is 48kOhm minimum.Sorry, I think we need more info to make a recommendation for you.
Answered by: Travis Rysdam
Date published: 2013-03-18

Can I parallel bridge 2 of the channels?

Asked by: kipp
No, the amplifier chips are already bridged as far as they can go.Since you are asking if you can bridge only 2 of the channels, it stands to reason that you may be looking to get more power to a subwoofer. If this is indeed the case you could use two separate channels to power separate voice coils on a dual voice coil subwoofer.
Answered by: Travis Rysdam
Date published: 2013-02-22

How to lower the THD

The specs show a lower wattage with lower THD. How does one lower the wattage when working on a project? Is this literally using a lower volume or using a lower VDC rated power supply? I want to run 8 ohm speakers at the lowest THD possible but not sure how.
Asked by: SonyPete
I am sorry about the confusion, the higher the output, the higher the distortion is. To keep the distortion down, just use it at a lower volume.
Answered by: Chrisf
Date published: 2013-02-22

Could i add a circuit breaker...

To the audio outputs to protect the speakers and the amp from over driving and, if so, what speaker circuit breaker would be suited for 8 Ohm loads on each channel, I know this is kind of a stupid question since the minimum recommended impedance for this board is 6 Ohms, but, I tend to drive my systems up the wall with overly loud bass. I'd probably easily overdrive the amp, even on 8 Ohm loads. My bet it to use the 100w circuit breaker(260-820) I mean it's unlikely id sustain 100w+ with this board on 8 Ohm loads, but it's just a precautionary idea.
Asked by: Wolf Punch
It is unlikely you are going to damage your speakers if they are rated to handle 100 watts at 8 ohms as this board is only rated to put out 80 watts at 8 ohms... UNLESS you are feeding them a clipped signal.You get a clipped signal from driving cheap under-powered amps too hard, which it sounds like you have every intention of doing here : )This circuit breaker, and indeed all that I have encountered are too slow to protect your speakers from clipping as they need a sustained signal over the rated power. From the description:"Thermally opens when power level reaches 200% of rated hold current for 5 seconds. Power levels ratings are estimated and given for a 8 ohm load."So, in short, this will not protect your speakers.If you really want to enjoy your "overly loud bass" without destroying equipment you need to invest in a better amp and some speakers that have accurate power ratings.
Answered by: Travis Rysdam
Date published: 2013-02-22

Can I use the Sure rotary encoder volume control with this amp?

The model AA-AA11117 Rotary Encoder + Volume Control Board works for some models of amp boards; would it work for this one? (I suspect that I might need 3 since the volume control seems to be for a pair of channels)
Asked by: scottghall
Unfortunately no, this amplifier will not work with those encoders.
Answered by: MattP
Date published: 2012-11-27

So... where is the mystery power supply?

From what I am reading, and forgive me for being new at this, there is no 36VDC 18A regulated power supply here at PE.The 24VDC 14.6A 350W is not enough juice.The 48VDC 12.5A 600W is too much juice.I tried to find one that was 36VCD AND 18A online and found one- for almost $300.What's the solution here? Settling for less than 100WPC? I just don't have the electrical knowlege to field this myself and am just getting into the DIY audio. But I really want to build an amp and even though I will not start with this one, I do have plans for it in the future. I am just lost on the power supply situation.
Asked by: Spaker
If you are unable to build a power supply then purchase is your option. The lower power will allow the amp to work well, but not at full rated output. With the power supply below you should be able to obtain 65 to 80 watts. Remember demand from each amp will vary as input changes.For use in a small room system it will perform well.
Answered by: Nitnub
Date published: 2012-11-27

What happen if I don't need to use one of the 6 channels?

I have a 5.1 home theater system and and the power board just burns up. Can that board help me?
Asked by: Orcuperz
If this is a home-theater-in-a-box style system, this will likely still require 6 channels, because the amp is in the system for the sub as well. I don't know how your system is or how it's wired, but if you can attain RCA preouts for all channels, this may suit your issue *IF* the preamp and decoding circuitry is okay. (That's a big IF, and you may just be better off buying a new receiver/system.) If you have a vid-player that has all channels of preouts decoded for analog connection, this could also work, but you'll still require a level adjustment method, not unlike a preamp.Just speculating here- but it is minutely possible this could resolve your issues. Of course- you'll still require the power supply as well, as the amp you have is likely run at a different voltage supply level.
Answered by: Wolfy
Date published: 2012-10-19

How would this run on 14v in a automobile?

I have an upgraded electrical with HO alternator and Odyssey (dry cell) battery that easily runs 14v and was hoping to get 6 channels at perhaps 50w X 6 to drive an active 3-way setup. Would this amp work in such a setup? I was hoping to tap into the factory fuse panel (20amp fuse) in order to avoid wiring a wire directly to the battery. (avoid firewall)I can mount the amp anywhere inside the cabin and add additional fans if need be. Please advise.
Asked by: jjohn
14 Volts * 20 Amps = 280 Watts. That equals 46.66 Watts per channel, not taking into account the efficiency of the amp, which it claims is 90%. So that would work out to be 42 Watts per channel, absolute maximum. It will work, the question is how well. I suspect you will run into a lot of clipping and start blowing fuses when you crank it up much. You will also need to devise a clever way to attach a very hefty power wire to that 20 Amp fuse. I would suggest at least a 12 gauge wire, preferably 10 gauge if you do it. The safe and proper way would be to run a 10 gauge wire from the battery with a 20 Amp inline fuse.I can't say this is ideal for auto use, but I know a lot of people have used these amps for such. One thing to pay attention to is that this amp is not intended to drive 4 ohm speakers (as most auto speakers are rated). You should only use 6 or 8 ohm speakers with this .Good luck, be safe, and have fun!
Answered by: Travis Rysdam
Date published: 2012-07-04

Why couldn't you use the 48VDC 600w Power Supply (#320-317) ?

Asked by: Invisible Audio
The 320-317 power supply outputs 43 to 56 Volts DC output, this amplifier requires 14 to 39 volts DC.It may work but I wouldn't recommend it as the amp may be damaged by the excess voltage.
Answered by: an installer
Date published: 2012-05-17

Chassis for this Board

Does Parts Express carry a box that would fit this board? Does anyone else know of place that I could get a box of the correct form-factor?
Asked by: Hawkfb63
Unfortunately, we do not currently carry cases specifically for these amplifier boards. We do have a selection of project boxes that would accommodate the boards, but drilling for various connections and/or fitting additional components would be required.
Answered by: RussR
Date published: 2012-05-07

Can I run 3 of these amps from a single power supply? If so, what specs? And, do you have any recommendations?

I need to run 3 (count 'em, three) of these amps for a theatrical-type, self-contained, amusement-ride-esque project. While three independent power supplies is not entirely out of the question, a single power supply just feels more-logical and the "right" thing to do. But, if the cost of a single supply (am I looking for 54 Amperes?) far-exceeds the cost of three independent supplies, then three it is. Many thanks!
Asked by: Faro
I think you will find (I have looked at this but not in the past month) that 3 individual PS's is best. This also gives you redundancy if one fails (you can run 2 amps on one PS for brief periods). The very high amperage switching supply you would need for 3 of these boards would be VERY expensive--it is because the high amp supplies are special items, whereas the smaller PS's are a commodity and also much less expensive to construct.Though you will not get full rated output from the amp board (I doubt you will need it unless your application requires thermonuclear level sound), the 24V 350W Meanwell supply from Parts Express should drive this board adequately. However, if you need more drive, there are similar industrial grade PS's that supply up to 36 VDC at 400W ratings, for about 1.5x the cost. Once you get above 400W, the price per supply appears to vary with the 1.5 or so power of the rating (i.e. not quite the square of the ratio of power to 400W but close).
Answered by: Doc Jones
Date published: 2012-05-09

Would you be able to run this amp off of two of the 24V 350W power supplies?

Asked by: lawler3000
Yeah, I should think so. Just wire them in parallel to get the full possibility of 700 watts @24 volts.
Answered by: Honest Rob
Date published: 2012-09-12

4/8 ohm

i was wondering if i could run 3 channels at 4 ohm and the other 3 at 8 ohm?
Asked by: rap700r
Yes, you can do that. All 6 channels are completely independent of each other, and they can all handle either 4 or 8 ohm loads.
Answered by: eboyer
Date published: 2012-02-16

TDA7498 vs TK2050

I was going to get x3 of the Sure TK2050s to run a MTM so each driver had it's own amp. But after seeing this (even tho I just odered my 2x100 kit, ggrrrr). I assume the output quality is nearly the same? Anyone have hands on experience with this?
Asked by: DVanDoren
There are several differences between the TDA7498 amp board and the TKO2050 amp board.The TDA7498 has 6 speaker outputs rated at 100 watts each at 6 ohm. sufficient for a 5.1 home theater sound system. The TKO2050 only has 4 speaker outputs rated at 100 watts each @ 4 ohms.Each board requires a slightly different power supply, the TDA7498 has a different frequency responce specification, however I believe the difference is minimal considerering the speakers most likely used.Parts Express has the complete product info sheet and specs posted on the website if you would like to review them in detail. Depending on your need for either 4 or 6 speakers, I would compare them as very similar in performance.Good Luck
Answered by: Nitnub
Date published: 2012-05-09

14 to 39VDC @ 6 x 100W

Hi,I was planning on a 5.1 DIY for speaker system. So, this device came into the, "hey this just might work" list.It says here that the 14 to 39 VDC at 6 x 100W so that is 600W. Meaning, you would require more than 600W input to get the full output?Is the 24VCD 350W the only Power supply available in Parts express? Are there alternatives to get 600W supply with 36-39VCD?
Asked by: Sunny
A better way if it fits your usage, would be to get a medium size 12V gel-cel battery. Then you keep it charged with a 15VDC 1 A wall wart or some such. This can be made to be portable, too!I keep a car battery at my bench for testing and development of my projects, to run high-power amps. Then design in gel-cel which are smaller and portable. They last about a day at full power. AND you can keep them charged using a 10W [12v/1A] solar panel! Free NRG!
Answered by: Fanden
Date published: 2013-07-06

I need a 5.1 amp to mount with my htpc.

I have 2 unused rails from the pc power supply at 12v 18a each. would 12v be enough to power this amp? Driving 4ohm 5 inch 2-way speakers, volume is not a concern but quality is.Thanks,Peter
Asked by: Pepond
You wouldn't have enough voltage 12VDC, to run the amp. You would neeed a step up transformer to get it up to 24VDC or you can connect two transformers that are 12VDC in series to get 24VDC.
Answered by: Zobadar
Date published: 2012-12-30


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