parasound 1200ii had no sound

deseroner

i have a parasound 1200ii amp, it had no sound i am only venting 3 inches above and on its side , it was playing for 20-30 minutes, then no sound. man i was biting my nails, i just purchased. i took out of cabinet and it is not shutting off anymore, almost 45 minutes no problem. what could it be that caused it to turn off sounds, al lights are normal. i have my sat receiver above.it gets hot .

dcmartinpc

That amplifier has a thermal circuit that will shut down the amp if it gets too hot. 3 inches is not enough clearance for that amplifier. I have 6 inches above my HCA-3500 and that really even isn't enough. Needs more like 8 if you can swing it.

Don

deseroner

dcmartinpc wrote: »

That amplifier has a thermal circuit that will shut down the amp if it gets too hot. 3 inches is not enough clearance for that amplifier. I have 6 inches above my HCA-3500 and that really even isn't enough. Needs more like 8 if you can swing it.

Don

it is still running with problems, damn i have to move my sat receiver. i can get 7 inches of clearances . sides the max is 3 inches.

Polkie2009

I've got the same model of parasound as you deseroner, these babies need plenty of air to breath.I've got mine by itself out in the open and have never had it shut down no matter how hard I've run it.

soundfreak1

I own a 1200 as well , strongly rec. You keep it out of any cabinet, they need air. Also mine got very hot just before servicing and found a cap was leeking. Don't know if related or not but once new caps were installed and relays heat seemed to reduce quite a lot. But I would never use an inclosed cabinet!

deseroner

thanks , running it outside still, running strong so far. man i need to figure out where to put it.1 year old.

deseroner

testing .
before :


after:

gonna run fan behind unit . just on top for test.

by the way the 2250 amp runs cool also the fosgate runs a cool ,but not in bridged mode.

dcmartinpc

deseroner wrote: »

by the way the 2250 amp runs cool also the fosgate runs a cool ,but not in bridged mode.

The thing you have to remember about the 1200II is that is a ClassA/AB, and the bias is set fairly high... The New Classic I know for sure is ONLY a Class AB amp, not sure about the Fosgate. Class A Bias amps run MUCH hotter, and the Parasound HCA-1200II or even the HCA-1500A both have internal heatsinks. It makes heat disspation more of a concern.

Class A amps run HOT, that is most likely the difference. But Class A is worth it I think the 1200II runs approximately the first 10 or 15 watts Class A, then switches to Class AB. The New Classic is AB all the time, which saves a ton on heat. My guess is that is what is going on and why it runs so much hotter. I have 4 parasound amps, and they all run hot, and all but one have external heat sinks.

The fan will help a lot as it will circulate the air inside the chassis and help the heat sinks do their jobs.

BTW... Have you tried the 1200II on your mains? You just might like it. Vintage HCA Parasound or the new Halo is where its at, JMHO :biggrin:

Don

deseroner

dcmartinpc wrote: »

The thing you have to remember about the 1200II is that is a ClassA/AB, and the bias is set fairly high... The New Classic I know for sure is ONLY a Class AB amp, not sure about the Fosgate. Class A Bias amps run MUCH hotter, and the Parasound HCA-1200II or even the HCA-1500A both have internal heatsinks. It makes heat disspation more of a concern.

Class A amps run HOT, that is most likely the difference. But Class A is worth it I think the 1200II runs approximately the first 10 or 15 watts Class A, then switches to Class AB. The New Classic is AB all the time, which saves a ton on heat. My guess is that is what is going on and why it runs so much hotter. I have 4 parasound amps, and they all run hot, and all but one have external heat sinks.

The fan will help a lot as it will circulate the air inside the chassis and help the heat sinks do their jobs.

BTW... Have you tried the 1200II on your mains? You just might like it. Vintage HCA Parasound or the new Halo is where its at, JMHO :biggrin:

Don

i found where it needs the air to flow ,it is on the left side of unit, going to get a silenx fan, i have not tried on my lsi15's on this amp yet.i know the fosgate 4200 is 50 amps.

deseroner

well i got me a thermaltake 120mm fan 58 cfm 16 dba,mounted on left side of 1200ii and now still running 6 hours straight no hicups. i am trying my lsi15's on 1200 amp,so far so good, i also bridged my 2250 to my center speaker .

leroyjr1

No need to bridge any of your amps with those speakers. 300 watts @4 ohms is more than enough and 600 watts to that center channel is definitely not needed.