Think I need a fan on PL 400 series 1

[roccus]

Been pushing the 400 today keeps shutting down from heat... think I need a fan or 2 on the cooling fins... what would be best to have fans pushing air down from the top of amp or straight in from the back??

 

[Billboard]

I run my 400 8 fin into a 4 ohm load, I use a fan on it all the time.

If you are not running into a 4 ohm load you may want to check your bias voltage, if this is off you will generate heat.

I just use a 120 volt desk fan hitting from the back, the fan switches on with one of those automatic power strips.

 

[laatsch55]

I can shut a 400 down on my K's.....and they are 8 ohm....

 

[roccus]

Never had this problem when I drove these same speakers (8 ohms) with my Carver TFM 55.....

 

[roccus]

You mean bias voltage on the control board? I have a few cooling fans kicking around somewhere in a box will have to go hunting..

I run my 400 8 fin into a 4 ohm load, I use a fan on it all the time.

If you are not running into a 4 ohm load you may want to check your bias voltage, if this is off you will generate heat.

I just use a 120 volt desk fan hitting from the back, the fan switches on with one of those automatic power strips.

View attachment 25878

 

[laatsch55]

The heatsinks on the PL's were wholly inadequate anyway.....and they havent gotten better. I even built some copper heatsinks, still had to force cool them.

 

[WOPL Sniffer]

The Clair Brothers used to use a truckload of dry ice for a concert to keep the amps cool. Could get expensive though and the threat of frostbite sux.

 

[Billboard]

I can shut a 400 down on my K's.....and they are 8 ohm....

Before I placed a fan, I never had my stock 400 shut down, guess I wasn't trying hard enough.

Using 4 ohm Ohm Is

I did blow some outputs...

 

[laatsch55]

Yep, gotta fan em into 4 ohms...

 

[roccus]

lmao!!! think I will pass on that!!

The Clair Brothers used to use a truckload of dry ice for a concert to keep the amps cool. Could get expensive though and the threat of frostbite sux.

 

[WOPL Sniffer]

The things we'll do to keep the music crankin......... How's about a CO2 fire extinguisher? And maybe a scantily clad Nubian to do the hozin????? NAVO??????

 

[Fishoz]

Back off Nav...it's hot enough already!

 

[roccus]

Well could set it in a deep freezer cranked all the way to max freeze maybe cut a sqare hole in front of freezer to put a glass there so I can still watch the meters pegged out

The things we'll do to keep the music crankin......... How's about a CO2 fire extinguisher? And maybe a scantily clad Nubian to do the hozin????? NAVO??????

 

[Danimal1969]

I run my quasi comp 400 into a set of klipsch KG4's which are 6 ohm. At nice loud volumes, after 45 minutes it gets pretty toasty. But it hasn't shut down yet. I will probably get a fan for this. Lol

 

[stuwee]

I can shut a 400 down on my K's.....and they are 8 ohm....

That's because you are one sick puppy , you need help buddy! It's just not normal to have the meter's pegged 24/7

ya!!!!

 

[roccus]

I think that red area on those meters should be happy faces instead of red lines

That's because you are one sick puppy , you need help buddy! It's just not normal to have the meter's pegged 24/7

ya!!!!

 

[laatsch55]

That's because you are one sick puppy , you need help buddy! It's just not normal to have the meter's pegged 24/7

ya!!!!

WELL YEAH!!!!!!

 

[roccus]

new fans

Built this over the week end works real well amp running a lot cooler now

 

[laatsch55]

Airflow is a good thing......