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Technics REQ0251-1 100W Subwoofer Plate Amplifier

Brand:| Model: REQ0251-1
Save up to 50% off this 100 watt, 1 ohm stable, subwoofer plate amplifier through this Parts Express exclusive factory buyout!
  • Auto-on circuitry with a silver remote power panel on a 16" lead
  • 50 to 200 Hz variable, 12 dB/octave low-pass filter
  • Phase-reverse switch
  • 1 ohm stable
Part # 
Weight: 4.1000 lbs.  
Regular Price$99.00
You Save59%
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Polarized 2-Pin Universal AC Power Cord 6 ft. Type D
Qty: 1Part # 110-103
List Price:$5.99
Part # 309-046
Qty:  EA
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Product Details

Technics REQ0251-1 100W Subwoofer Plate Amplifier

Technics designed the REQ0251-1 100 watt subwoofer plate amplifier to provide power to their SB-AS500 dual 5-1/2" active subwoofer. A remote power panel is provided for locating the power switch on the front of your subwoofer cabinet. Auto-on circuitry provides power when you need it, and then goes into sleep mode when not in use for reduced power consumption.

A continuously variable 12 dB/octave low-pass filter is provided and can be adjusted from 50 to 200 Hz; the phase reverse switch to tailor the subwoofer to your room and other speakers. For connection to your home theater receiver, a single RCA input is provided.

Save up to 50% off the regular retail price through this Parts Express exclusive, factory buyout. Hurry, supplies are limited!

Specifications: • Power output: 100 watts RMS into 1Ω • Power requirements: 115 VAC, 60 Hz • Plate amplifier dimensions: Overall: 8-13/16" H x 8-1/16" W x 5-1/2" D, Cutout: 7-5/8" H x 6-15/16" W • Power panel dimensions: Overall: 3-1/8" H x 2-9/16" W x 3-1/2" D, Cutout: 1-7/8" H x 1-1/2" W.

Technics REQ0251-1 100W Subwoofer Plate Amplifier
  • BrandFactory Buyouts
  • ModelREQ0251-1
  • Part Number309-046
  • UPC848864012742
  • Product CategorySubwoofer Plate Amplifiers
  • Unit of MeasureEA
  • Product Rating
    (8 Reviews)
  • Weight4.1000 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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Technics REQ0251-1 100W Subwoofer Plate Amplifier
Technics REQ0251-1 100W Subwoofer Plate Amplifier is rated 4.25 out of 5 by 8.
Rated 4 out of 5 by from Right amp for the jobI bought this amp to power a sub for my surround sound system. The amp was physically too large for the enclosure so I build a new one just for the amp. Great sound, a great addition to my home theater system. Also bought for this project: 2 - Sony 2-Way LCD TV Speaker Bar Module (for surround), Part # 299-685 & 2 - Philips 2-Way LCD TV Speaker Module(for center speaker), Part # 299-680.
Date published: 2014-04-05
Rated 5 out of 5 by from Perfect so farI bought this to replace the plate amp in my Onkyo surround subwoofer. The original became damaged after my children thought it was a good idea to put metal screws into the sub vent and they contacted the amp board.... I like the fact that this amp is enclosed, so no worries about little saboteurs with random metal objects. So far, nothing but good things to say about this amp and especially about the price.
Date published: 2014-04-03
Rated 4 out of 5 by from Technics 25 or 50 watt plate amp (no way its 100w)I bought two of these for two sub boxes that i had made back in high school. I made phone stands out of oak because mom wouldn't allow a sub box in the house lol. Well now 20 years later i still have these well built cabinets that still look good even in my newly built home. Anyhow i was using and old Sony amp from an old school tower system. It had plently of power for these even though the right channel was blown, so i was running both subs of left channel and speaker A/B. I figured this was a better solution since they shut off automatically. So i installed one in each cabinet. I had upgraded the subs from jc whitney 8's to MA audio 8's a few years back. These are bandpass cabinets and actually do quite well even with the lows. Anyhow i wired these into 2 ohms. This amp is clearly not enough at 2 ohms. Barely moves the driver at max output level and sub level cranked up on my onkyo receiver. I was not anticipating this, i thought i would have plenty of power.So unless you plan on a 1 ohm load i would not buy these amps. Too little power at 2 ohm.I did rectify my problem by setting all my speaker levels on the onkyo to -12, and i now how to turn it up to 50 for volume to watch tv normally, but my amp maxes out at 60, so no more room for playing music at high volume anymore.So make sure you have two 2 ohm drivers to wire to one amp to get some power out of this thing, or have 6" or smaller drivers i guess.....
Date published: 2014-04-17
Rated 4 out of 5 by from Good Amplifier for the MoneyAll the specs stated, 100 watts 1 ohm stableWhat I would have to assume it is rated at 100 watts @ 1ohm One channelMost amplifiers are rated at 4ohm or 8 ohmHere is an example; 150 rms watts per channel into 8Ω, 225 watts per channel into 4Ω and 280 watts into 2ΩBased on this 320watts into 1Ω.So based on 100w @1 best guess would be 50w @ 4Ω. Mono channelI have 8 subwoofers with spring loaded connectors on them.For this review I am not going into all the different subs I own.Except to say only 2 are 8ohm the rest are 4ohm subwoofers.When you buy a plate amplifier instead of mounting it in one sub,I recommend mounting it in its own enclosure with a handle and quick connect.It takes the same amount of room as pair of boots. Run speaker wire where ever you sub is and plug it and adjust it.This amp for the money is ok with one sub, but being 1 ohm stable – running 2 subs in parallel it thumps nicely at 2ohm load, worth the $40 bucks. Ported enclosures helped the amp. Read up on power ratings for sealed versus ported. Ported are more efficient less power delivers more thump for the buck.Featureless amp except for on/off button - 2 starsPower for the money – 4 starsGreat amp for the money for someone who bought a sound bar and needs a little extra bass than the sub that came with that.
Date published: 2014-04-17
Rated 3 out of 5 by from Simple to Use, but Low on the Power Output Side.Bought this amplifier plate because of the cheap price and 100 watt power rating.It is "adequate" for my Zone-2 setup; however, I would not recommend this product for a primary subwoofer build. It simply doesn't have the RMS power to give a good multi-media experience.For my build with this amplifier plate I wired a 90-watt 10" DVC (2ohm x 2ohm) speaker with a coated paper cone and butyl-rubber suspension subwoofer. I wired the subwoofer to 1ohm impedance, and installed it with this plate amplifier in a ported (1.25"), 0.75" thick medium density fiberboard box (15"x18"x12").PROS:*easy to use*easy to set up*good audio response from A/V receiver*inexpensiveCONS:*low power output to speaker
Date published: 2014-03-21
Rated 5 out of 5 by from Acheiving a 1 ohm load isn't that important !Well , I wired a few sub - woofers together and while @ a 1 ohm load , and receiving the most power: rated @ 100w RMS into 1 ohm load (mono) there where more phase issues and placement concerns than it was worth. So I chose to wire my Dual 4 ohm A.R. sub plus 2 smaller 8 ohm sub-modules from an Isuzu Rodeo. Running around 1.75ohms or ? watts is still plenty loud but I have more headroom , flatter response and less phase issues. The sound is tight and controlled and the remote on / off allows me to contrast my studio mixes more easily as well. Built sturdy and with Aluminum face plate as heat sink , it barely gets warm. Great product for the price-wise or Hobbyist / D.I.Y.'er like me
Date published: 2014-04-17

Product Q&A

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who own this product or have experience with it.
If your question requires design or troubleshooting information,
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Technics REQ0251-1 100W Subwoofer Plate Amplifier

Novice question here but, a) are there any 2 ohm subwoofers that I could use two of them to create a 1 ohm load?  and/or b) what about the subs that are DVC and each coil is 2 ohms, when wired properly this creates a 4 ohm load right? Could you make it 1?

Asked by: henhez
For a DVC (dual voice coil) where each driver coil is 2 ohms, you can wire in parallel and the total load is 1 ohm. Parallel means connect the two positive driver posts together and connecting them to the positive amp lead. Wiring in series means connecting one positive driver post to one negative post forming a chain of speaker coils, doing two 2-ohm coils in series way results in a 4-ohm total load.
Answered by: Longfatty
Date published: 2014-03-07

RMS wattage at 4 ohms? 2 ohms?

Asked by: Jforce2
The average "non transformer" outputs supply around 75% efficiency. That's a real general rule of thumb. At 1ohm #a rare power load# rating, the amp delivers 100watts. So, at 2ohms approx. 70watts, at 4ohms approx. 50watts. Still--This is a lot amplifier at this price point!
Answered by: Joe from San Francisco
Date published: 2014-03-07

How easy is it to bypass the filter and/or is a schematic available?

Asked by: williewumpwump
Unfortunately we do not have schematics available for this amplifier since it is a buyout item. We do not recommend modifying them since it will void the warranty.
Answered by: MattP
Date published: 2014-03-07

D-type Power Cable

Do you guys sell a D-type power cable? A search on your website only brings up 3 more devices that require one.
Asked by: Scott B
Unfortunately we do not offer a D style power cable at this time.
Answered by: MattP
Date published: 2013-11-05

Building an active sub

Can this unit be used to convert a passive sub into an active one?
Asked by: ClydeG
Yes, your subwoofer system will be "active". The power rating into 1ohm is 100 watts. If you use multiple speakers in your box design, this will drive em'. If you have only one--there will be less power developed. How much less depends on the impedance load and how the amplifier is designed. Should be really good for home HiFi though.
Answered by: Joe from San Francisco
Date published: 2014-03-07

Since this unit was used to power 2 subwoofers, does that mean there are 2 leads for 2 subwoofers? My plan was to power 1 10" Dayton woofer, but i'm curious if this amplifier plate will require you to use 2 subwoofers to get the most wattage out of it.

Asked by: Grenadineflaps
This amplifier has a single output that was daisy chained from one subwoofer to the next in parallel. You can get the most wattage from this amplifier by using a 1 ohm load. With 4 ohm drivers this means you will need 4 of them wired together.
Answered by: MattP
Date published: 2014-03-07

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