pm1200 losing bass output

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carlos
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pm1200 losing bass output

Post by carlos » Sun Jan 27, 2013 7:46 am

I have a pm 1200 and a pm 900 from around the early/mid nineties. Only used at home now. I am running one set of speakers and have
just noticed if I switch from the 900 to the 1200 all the bass dissapears? If Ipull down one of the channels all the bass comes back.?
So one input on its own gives great bass response, as you push up the faders from the desk the other speaker comes on but all bass nearly gone. Tried all combination of leads
speakers etc but as I said with the 900, same set up full sound. I am no electronics person but just need to know so i can take a decision whether to get it fixed.

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TNRabbit
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Re: pm1200 losing bass output

Post by TNRabbit » Mon Jan 28, 2013 6:16 am

Sounds like gou have the speaker wiring out of phase.
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Main: HotRodded AL-IIIs
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carlos
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Re: pm1200 losing bass output

Post by carlos » Mon Jan 28, 2013 7:33 am

Thanks for response. I thought about this but if I swap to the PM900, same cables, leads etc, works fine??
Second speaker comes online, bass stays in the sound and the whole thing gets louder. ???

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Re: pm1200 losing bass output

Post by TNRabbit » Mon Jan 28, 2013 1:27 pm

Has it always been like this, or is this a new development? If it's always been like that, I'd take a look inside the speaker & see if anything is wired wrong. I've had TWO pair of Klipsch speakers come from the factory with speaker leads on the wrong post~
TNRabbit
Image

From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.

carlos
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Posts: 3
Joined: Sun Jan 27, 2013 7:36 am

Re: pm1200 losing bass output

Post by carlos » Tue Jan 29, 2013 4:57 am

thanks for response.

Can't be speaker as with other amp sounds great? Used to gig these regularly, no problems. Sat in house for about 12 years but has recently been used for band to practice with so I'm wondering if something has gone inside? gomma take it to original supplier and get it wired up to there desk/speakers and give it a listen.

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jjptkd
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Re: pm1200 losing bass output

Post by jjptkd » Tue Jan 29, 2013 2:28 pm

Sounds like the amp needs service or replacement. You could probably find one working for relatively cheap on eBay but may run into problems down the road as these amps are nearing "vintage" status. :?
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byacey
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Re: pm1200 losing bass output

Post by byacey » Sat May 14, 2016 5:57 pm

The PM1200 has a bridging switch inside between the input connectors. If this is pressed in, it will reverse the phase on one of the channels.

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frenchguy
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Re: pm1200 losing bass output

Post by frenchguy » Sat May 14, 2016 6:32 pm

Maybe Jesse or someone else can chime in on this, unfortunately Gary won't be answering your post as we lost him to a motorcycle accident about 6 months ago! :(
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