chipamp lm3886 mono for a polk psw1000???

[jordyyy]

So today on craigslist I bought a Polk psw1000 (PSW1000 Product Page : Powered Subwoofer : Polk Audio) for $75 because a surplus place is selling them without amps. I have been planning on making an amplifier and this gave me a perfect reason to do so. The polk has 2 10 woofers rated at 500rms max each. I was wondering if I made the chipamp.com lm3886, or the hifidiy.com lm3886, if it would work well with this sub?

Is the chipamp or the hifidiy lm3886 better than the other? Also can I connect both subs to the mono lm3886? The subwoofer also has a volume and frequency control unit on it, I assume this is the crossover? How Do I connect the 8 pin connector from the volume/frequency unit to my amp?

I will post pictures in a minute for better clarification.
thanks for the help

[jordyyy]

[AndrewT]

what is the impedance of the drivers?
Are they connected in series or in parallel or separated?
What is the sensitivity of the drivers?

[jordyyy]

The drivers are 3.5 Ω each, almost 4Ω. They are separated currently, but they are suppose to be connected in parallel. In parallel they are 2Ω. they are 88 db. The old amp had 400watts of power

[dangus]

One LM3886 per woofer could work. But, personally, I'd just as soon fill the hole, and run each woofer from one channel of a stereo amp. Something like a Peavey CS400, but whatever you stumble over at a music store, online ads, or yard sale at the right price. Even a stereo receiver or integrated amp. If I had a 2 ohm stable amp, I might be tempted to get a second sub...

[jordyyy]

I know I can just purchase an amp for it or get it to play other ways. I am more interested in actually building an amplifier, so I can use it in my school portfolio. But I do want to make an amplifier that will make good use of the subs, because they are good quality. Can the lm3886 handle a 2Ω load?
the peavey cs400 did look pretty cool though, I had never seen one of those.

[dangus]

One LM3886 per woofer could work. But, personally, I'd just as soon fill the hole, and run each woofer from one channel of a stereo amp. Something like a Peavey CS400, but whatever you stumble over at a music store, online ads, or yard sale at the right price. Even a stereo receiver or integrated amp. If I had a 2 ohm stable amp, I might be tempted to get a second sub...

[jordyyy]

I don't know how that double post happened or where my other post went...

[AndrewT]

Don't even think about using the two drivers in parallel.
That leaves two choices
1.) drive them independantly
2.) connect them in series and drive the 8ohm equivalent pair.

Now to sensitivity.
88dB for what conditions?
Was that 88dB/W @ 1m for each driver
or
88dB/W @ 1m for the pair of drivers
or
88dB/2.83V @ 1m for each driver
or
88dB/2.83V @ 1m for the pair of parallel drivers?
Can you determine which of these applies?

Let's assume you go for option 1.) and use a pair of 3886 to drive them.
Each 4ohm speaker can get ~60W maximum from a 3886 using a +-32Vdc PSU. This PSU will sag to ~+-27Vdc to +-30Vdc, when trying to deliver full power.
Total maximum input power is ~120W

[srinath]

This may be a good candidate for a resurrector - check out - Building a Gainclone chip amp using a Resurrector

I have nothing much to add, except that I have a dead KLH sub with a burnt some or other in the amp.

Cool.
Srinath.