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Dayton Audio SPA500 500W Subwoofer Plate Amplifier
can this amp be modified to run off 12 volt - dc power?
i would like to build one into an automotive subwoofer box. is this possible? is it as simple as connecting 12v power, internally, past the ac supply/inverter?
Modifying it for 12V DC power would be very difficult and take a lot of time. Directly connecting the 12V supply either would not work at all, or would only allow the amp to output about 10W.Like most class-AB home amplifiers, this amp most likely runs off of a dual-polarity power supply (so, its power supply is probably feeding the amp something like +60V and -60V, considering what its power output capabilities are). Cars only have a single-polarity supply, and it's a relatively low voltage (+12V). This means you'd have to do 2 things to make this amp be able to run from a car's 12V supply line: 1. Boost the 12V supply to whatever voltage the amp uses (which is probably around +60V); 2. Create a negative supply line of the same voltage from this. Doing either of these is extremely difficult because it means designing and building a high-power switching power supply. This is an advanced topic of electronics engineering, and is very difficult to get it right for the extremely high powers that this amp would require.Even if this amp happens to run from a single-polarity power supply, you still have the problem of 12V being not nearly enough voltage. Based on the fact that this amp can deliver 500W into a 4 ohm load, if it was powered by a single-polarity supply, then the supply's voltage would have to be at least 126V DC, assuming it is not a bridged amp. If it is bridged, then the supply voltage would only have to be half: 63V DC. So this means you'd still have to build a switching power supply to boost the car's 12V line to around either 63V or 126V, which again would be very difficult, and also very dangerous because of the high voltage involved.It would be a lot easier to just buy a car amplifier that is meant to run off of 12V DC. All high-powered car amps have switching power supplies built into them to boost and invert the 12V DC line to whatever higher voltage is required for the amp to output its full power. Although there are some very low-quality car amps out there, there are also many that would sound just as good, or perhaps even better, than this Dayton amp.
Date published: 2012-06-06
Is the parametric EQ bypassed when using the LFE input - as the crossover circuit is bypassed? Or does the EQ still function when using the LFE input?
It is my understandind that this input is for sub lows that have been processed and as such these features ate bypassed.
Date published: 2014-01-03
I see in the video of this product that it doesn't have heat syncs. But in the product picture it does. Which is correct?
The heat sinks are in front and they are small but for its output rating and modern curcitry it should be just fine for effincey Good luck with your project. Oh, and make sure there will be plenty of space for air movement.
Date published: 2013-07-10
What is the internal displacement of this amp? Thanks.
Cutout is 10 x 10. Amp depth is 5 1/4". Therefore 525 cubic inches. However, deduct 10 x 10 x (thickness of your cabinet). So if 1" thick, deduct 100 cubic inches for a net of 425
Date published: 2013-09-05
It's Humming help?
After 1 year it's now humming, can I do something or is it time to replaces ?
The 60hz hum I believe your are referring to for me comes from my cable box somehow. The only fix that I have found is to use a ground loop isolator on the LFE output before it hits the amp...sub still hits all the notes but takes the hum out completely.
Date published: 2014-01-03
Does this amp suffer from the hum problems exhibited by the SA series amps?
I have several high power amps and sub's in my home, ranging from 240 to 1,000 watts, but only my sub's powered by Dayton SA240 amps have the hum problem. They always have to be plugged into the same outlet as the preamp feeding them. I do not want to spend a lot of money on a pair of these only to discover the same issue.
I can't claim that my house is wired like yours, but my sub is dead quiet (except when I don't want it to be ;) .
Date published: 2012-06-23