Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Tecchris0516,
Did you get it completely repaired and working correctly?
Jr_ece
Member
Last Activity: 03-04-2021, 01:40 AM
Joined: 02-14-2018
Location: Texas
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
I asked about the fuse due to some similar klipche subs being shipped with incorrect/faulty fuses. The service manual and probably users manual should state the correct size fuse.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Tecchris,
Have you located the service manual? The schematic and parts list are included at least for the PS-12. With the parts list you can get data sheets to determine if the voltage makes sense. I didn't have to mess with the power supply circuitry or transformer so I don't have any specific data that I can recall without digging into the documentation mentioned.
Do you know for sure the fuse rating including voltage, amperage, and speed are correct?
It seems like there was some discussion on...Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Good times but tiring.
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
I stuck with the TIP31C part number. I thought you did too based on your parts lists:...Last edited by Jr_ece; 06-08-2018, 11:38 PM.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
You are probably right. We'll see how it performs over the next few months, and if it continues to be solid clean Bass then we'll probably just use it. Really appreciate the help! It was very good having someone else walk through the repairs at the same time. We could not have timed that any better....Last edited by Jr_ece; 06-05-2018, 05:38 AM.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
I've been busy so no time to pull the amp back out and investigate.
I agree that my sub also sounds good especially after tweaking it more (gain, phase, freq), but I'm having to run it with a +6.5db input wheras before repairs it was at +1.5db. Actually +5db is probably closer to equivalent, but I think it sounds better with the input a bit higher and the gain dialed back. I guess the input difference is okay just puzzling. One of the side effects of turning up the input (from receiver) appears to...Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Confirmed I replaced all of these caps:
C2, C4, C6, C8, C9, C35, C37, C78Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Jiari,
Thanks for the clarification. I haven't had a chance to test. No worries.
Yes, glad to see bud here.
Wondering if the long leads on the 2 film caps are having any negative impact. I think in general you want short leads on caps.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Yes, I'm pretty sure I got all of those caps. I ended up changing all the electrolytic caps except c64. I meant to change it too, but missed it.
I'll measure the +/- 15v rails.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
As for standoffs, I believe I'm using one inch long standoffs with number 6 inch and a half long screws that were pretty close to the original screws in diameter but obviously longer to get through the standoffs. I think this is giving plenty of air gap around the amp. I now have a 50 mm fan mounted inside blowing down on the heat dissipating resistors. I'm getting a little bit of vibration noise that I think I can easily get rid of with a little bit of padding where the fan meets the plastic frame. At the moment I have a 110...Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Agree on the MOSFETs and capacitors. Both should have only improved sound quality.
The standby issue. My receiver volume level goes from I think -60 to 0db. It takes about - 32db before the subwoofer will come out of standby. After that I can turn the volume back down into the forties and I can still hear the sub responding to input. 32db is moderately loud. I've not had much time to see how long it will stay out of standby at the lower levels. Before replacing parts it would slip back into standby if I watched a...Last edited by Jr_ece; 05-24-2018, 10:04 AM.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
I will probably swap it. I already have a couple on hand that I purchased originally to fix the chirp/squeal.
My amp still takes a lot of input before it will come out of standby. Something is still amiss.
Another thing I didn't expect is what appears to be a loss of volume, but at the same time I think it's tighter cleaner bass. Prior to new caps is it possible a whole lot more unfiltered signal was coming through and adding to the volume? I bumped my receiver sub output to +5db from +1.5db, and it is...Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
I was also surprised by the difficulty with the heat sink screws. The odd part is it was only the two screws that come through the pwb and not the other sets of screws that hold the clips in place.
How would you define a chirp versus a squeal? If the only difference is duration than mine might be a chirp. It's not very long and it happens as soon as it comes out of standby.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
I finished replacing everything I ordered including the new MOSFETs and transistors. I had quite the time getting the heatsink back on due to apparently some binding from heat. The 2 PWB mounting screws did not come out easy. One would not thread all the way down so ended up using some small washers with the felt washer on the bottom. I forgot to thread the thermistor screw back in before remounting the heatsink so it had to come back off due to lack of clearance for a screw driver. The second screw would then not seat although...Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
jiari, I basically ordered the same parts. Should be here in a few days. Then find time to install...Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
I just took a quick glance at the service manuals for the 2 subs (Entra Sub Two, PS-12), and they are basically identical with the exception of just a few parts removed. Outside of the few missing, it appears all of the part numbers are exactly same. Sorry for the confusion last night!Last edited by Jr_ece; 05-12-2018, 10:23 PM.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Well duh. In one of my more recent posts I referred to my sub as PS-12. That wasn't actually correct. They are so close I just picked up that label for it. Mine is the Entra Sub Two. The service manual for it is Rev 1 4/2003.
I pulled down the PS-12 Rev 1 10/2004 service manual just to have it.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Interesting. I wonder what else changed between manuals. I'll have to look, but I think mine might 2002 or 2003.
Guess I made a good choice on those 2 caps.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
I decided against replacing C17 and C18 due to their use/location.Leave a comment:
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