I have an older JBL PSW1200 powered sub. you probably already know about the amp of this unit having issues. i actually had this sub for over 8 years now before the amp went out on me, but i like the sound of the sub. i can't find a GOOD answer to my question of what size amp to replace it with? i see people say the amp unit is 150W, another 200W, another 300W ??? i've been looking on a couple websites:
i would love to be able to find an exact match, but i know that's probably not possible......could you please let me know what is a 'good' amp to replace the defective one with? thank you soooo much!!!
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If it's a stereo receiver or Hi-Fi amp, then the speaker cables that would normally go direct to the front L & R speakers now connect to the sub's L&R speaker OUT sockets. Then you need two extra lengths of speaker cable. These go from the receiver's speaker outs to the sub's L&R speaker IN sockets.
Connecting to a surround receiver, just use the phono/RCA cable from the receiver's "Sub Pre Out" to the white phono/RCA labeled Low Level IN.
Go to Parts Express and buy the Bash 300w digital subwoofer amp.It fits almost exact except it is one inch shorter.Just use mdf to fill the space and this amp will outperform the original.I have done this and it's not really difficult,pretty straight forward. They usually sell for around $149,but they have sales often around $99.Good luck.
I had the same chirping issue with the sub. I found a document that talks about replacing the C5 capacitor for a 47mfd type instead of 470mfd. This solved the chirping issue however I still experience an intermittend issue with the power on indicator flickering off and on. Anyone hear of the fix for this?
Good chance it's the power supply; a capacitor there, the large one, may have gone. These things age and when they go, there's noisy power to the amp circuit and ... well, that may be what you're hearing.
You should check your audio wiring, too. That woofer could be picking up a 60Hz hum from the AC mains and amplifying it. Maybe you can try another spkr on same cables and see if hum is in your woofer or elsewhere.
These subs have had many problems, all associated with the amplifier section. PB 12's with an "M" as part of the ser. no. were assembled in Mexico and these are the ones with the amp problems. JBL fixed mine and sent it back no charge, BUT it cost me nearly $100 to send it to them in the first place. I have another one that has had no problems at all. Try sending it back for repair. At best you'll get a rebuilt unit back, at worst a substantial discount from the company for a new sub.