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Powered Subwoofer Amplifier Board Bass AMP 250W 8ohm, 300W 4ohm

US $55.99

ApproximatelyC $77.33

Condition:

New

Quantity:

More than 10 available5 sold

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eBay item number:272919402065

Last updated on Apr 17, 2025 22:38:08 EDTView all revisionsView all revisions

Item specifics

Condition: New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ... New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. See all condition definitionsopens in a new window or tab

Features: Passive Amplification

Number of Outputs: 1

Number of Inputs: 1

MPN: Does Not Apply

Receiver Combo Features: DVD Player

Audio Inputs: Stereo L/R RCA

Number of Channels: 1

Country/Region of Manufacture: China

Bundle Listing: Yes

Year Manufactured: 2021

Audio Outputs: Stereo L/R RCA

Model: WMY0004

Number of L/R RCA Inputs: 1

Number of Digital RCA Inputs: 1

Power: 250W

Supported Modes: stereo

Brand: Unbranded/Generic

Surround Sound Formats: stereo

Color: Red

Amplifier Class: D

Type: Power Amplifier

UPC: 723247540930

Item description from the seller

About this seller

Joined Jun 2013

Usually responds within 24 hours

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Detailed seller ratings

Average for the last 12 months

Accurate description

5.0

Reasonable shipping cost

5.0

Shipping speed

5.0

Communication

5.0

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4.0

2 product ratings

0 users rated this 5 out of 5 stars
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by sardobang
Jan 21, 2021
A Well Made Product but Lacking Information
Another reviewer was critical of the separate 12 volt and 30-0-30 power amp transforners. I don't agree. The separate 12 volt transformer allows connection to a relay and remote turn-on 12VDC like most modern hi-fi and HT gear. I would like to see how to "pick off" a protection LED and the board would be great if it had that built in. Not having a schematic is a problem, I agree with the former commenter who raised the same issue. I assume that the amplifier operates in BTL (bridged tied load) mode in order to generate such high wattage with such low B+ and B- (<50 volts) on the output devices. This concerns me about using 4 ohm speakers without substantial heat sinking, which is also not described by the board maker. Another reviewer was critical of the separate 12 volt and 30-0-30 power amp transforners. I don't agree. The separate 12 volt transformer allows connection to a relay and remote turn-on 12VDC like most modern hi-fi and HT gear. I would like to see how to "pick off" a protection LED and the board would be great if it had that built in. Not having a schematic is a problem, I agree with the former commenter who raised the same issue. I assume that the amplifier operates in BTL (bridged tied load) mode in order to generate such high wattage with such low B+ and B- (<50 volts) on the output devices. This concerns me about using 4 ohm speakers without substantial heat sinking, which is also not described by the board maker.
Verified purchase: YesCondition: NewSold by: wilson-su
by mikepattn
Jun 15, 2020
documentation unavailable
This looks like a nice DIY amp. The quality of the PC board and the silkscreen are good. My only issues so far (and I haven't actually fired it up yet - I'm still waiting on a transformer, which I had to order custom) are that (1) it requires a transformer with two separate secondary windings, one for the high voltage stages and one for the low-level input stages. This could have easily been dealt with by incorporating proper voltage regulators into the design, thus requiring a transformer with only one secondary, which would be much easier to find. (2) - any more important, to me, as a veteran DIY guy and design engineer - is that no schematic or other documentation is available, or so I'm told. This is a major drawback, IMHO, and I'm quite disappointed. If I had known this, I would ... This looks like a nice DIY amp. The quality of the PC board and the silkscreen are good. My only issues so far (and I haven't actually fired it up yet - I'm still waiting on a transformer, which I had to order custom) are that (1) it requires a transformer with two separate secondary windings, one for the high voltage stages and one for the low-level input stages. This could have easily been dealt with by incorporating proper voltage regulators into the design, thus requiring a transformer with only one secondary, which would be much easier to find. (2) - any more important, to me, as a veteran DIY guy and design engineer - is that no schematic or other documentation is available, or so I'm told. This is a major drawback, IMHO, and I'm quite disappointed. If I had known this, I would have bought another amp.
Verified purchase: YesCondition: NewSold by: wilson-su

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Powered Subwoofer Amplifier Board Bass AMP 250W 8ohm, 300W 4ohm

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wilson-su8311

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A Well Made Product but Lacking Information

documentation unavailable

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wilson-su8311

100% positive feedback•6.2K items sold

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