TPA3116 100 Watt Subwoofer Amp

[stoppage]

Hi I just purchased a Mono TPA3116 100 Watt Subwoofer Amp (I think it`s based on an “Aoshke” design) from Ebay and hooked it up to a very old speaker from an MBO ASL 1000. Is anybody familiar with this amp? The base somehow doesn`t sound very tight…. Or well-defined but I`m no way familiar with subwoofers, just trying out. Thankful for any comments

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[David Morison]

First thing to check is whether the speaker sounds the same with any other amp, assuming you can make that test.

 

[multisync]

when I look up MBO ASL 1000 i get a 5.1 speaker setup with the amplifier/receiver inside the subwoofer cabinet, is this what you have?
https://silo.tips/download/mbo-asl-...tives-51-lautsprecher-surround-set-by-4mbo-in
remember that the 100 watt rating is for 2 ohms and maybe 10-30 watts into 8ohms depending on the power supply you are using. Also the subwoofer crossover frequencies on your new TPA3116 will be different from the MBO ASL 1000.

 

[stoppage]

First thing to check is whether the speaker sounds the same with any other amp, assuming you can make that test.

I don't have a second woofer amp

 

[stoppage]

when I look up MBO ASL 1000 i get a 5.1 speaker setup with the amplifier/receiver inside the subwoofer cabinet, is this what you have?
https://silo.tips/download/mbo-asl-...tives-51-lautsprecher-surround-set-by-4mbo-in
remember that the 100 watt rating is for 2 ohms and maybe 10-30 watts into 8ohms depending on the power supply you are using. Also the subwoofer crossover frequencies on your new TPA3116 will be different from the MBO ASL 1000.

That is what I have but I'm only using the woofer, disconnected. At very low volumes its ok but otherwise it sounds overdriven. I think it might be the speaker

 

[Chompy]

This seems like a reasonable combination to me; the subwoofer was only rated 30w RMS according to the spec sheet, which a TPA3116D2 should be capable of even if it's an 8 ohm speaker. However as noted the crossover will be different (and appears non-adjustable), there could have been built in eq, etc. Still, if it sounds good at low volumes and isn't making mechanical noises when you turn it up, then I believe there is hope yet for this speaker.

What power supply are you using? Even though it will power up and operate on e.g. 12v, it will have severely limited power (which could explain sounding good, but only at very low volume). You will want 19 to 24v with 3+ amps (more is great but don't pay extra for it, at least for this project). If it's an 8ohm speaker, a 24 volt power supply would be best (~32w, 1% distortion, 8ohm, PBTL), but 19v should still get you ~20w into 8ohms. If it's 4ohm or less, then 16-19v is arguably better than 24v, but it's not critical. If you're not sure, I would try an old 19v laptop power supply because they are a good compromise and available cheap or free!

 

[stoppage]

I tried a 24v supply and it makes no difference. The volume is loud enough but it's completely distorted and vibrates at slightly higher levels

 

[multisync]

What is the source of the music?

Perhaps the source is distorting before the amplifier distorts.

Can you move the speaker cone in and out with your fingers? Is it quiet or does the speaker make a scratching noise.