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
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
what is the impedance of the drivers?
Are they connected in series or in parallel or separated?
What is the sensitivity of the drivers?
Are they connected in series or in parallel or separated?
What is the sensitivity of the drivers?
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
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...
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.
the peavey cs400 did look pretty cool though, I had never seen one of those.
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...
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
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
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.
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.
Why would I not want to consider running the drivers in parallel at 2 ohm? Bad for the lm3886?
After looking into other amp builds Im thinking of making an amp that is better for subs like the TAS5630 D-Class build at 400watts.
Im gone for the weekend and I will call polk when I get back to ask about the sensitivity again.
I am still trying to figure out how the resurrector works haha...
"The Resurrector makes an improvement to the chip amp by limiting the EMF (Electro Motive Force) from the the amplifier output and this in turn reduces the amount of current in the voicecoil of the driver." No idea what that means or does.
After looking into other amp builds Im thinking of making an amp that is better for subs like the TAS5630 D-Class build at 400watts.
Im gone for the weekend and I will call polk when I get back to ask about the sensitivity again.
I am still trying to figure out how the resurrector works haha...
"The Resurrector makes an improvement to the chip amp by limiting the EMF (Electro Motive Force) from the the amplifier output and this in turn reduces the amount of current in the voicecoil of the driver." No idea what that means or does.
Hello jordyyy, i have the same questions as you. I am interested to know if lm3886 are capable of handling 1.5 - 2 Ohm loads. Maybe the 3 x lm3886 design is better for this kind of use..?
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