or Connect
AVS › AVS Forum › Audio › DIY Speakers and Subs › Lab Gruppen FP14000 clone amplifiers
New Posts  All Forums:Forum Nav:

Lab Gruppen FP14000 clone amplifiers - Page 87

post #2581 of 4389
Beast is it possible to get a recording of that noise? Maybe using 15hz sine wave or something or with no load?

Gear mentioned in this thread:

post #2582 of 4389
I don't think I have a mic that would even pic it up. It literally sounds like electrical arcing, but is BARELY audible. I basically had to have my ear up to the amp to hear it.
post #2583 of 4389
Quote:
Originally Posted by keager View Post

Thats a good question. I have a couple times had my vpl lights flash and quickly turned it down. I think its kinda deceiving because the lights from the leds kinda bleed into each other, if that makes sense.

Here is the difference between bleeding green and amber biggrin.gif
post #2584 of 4389
I've had a hum every since I started using pro amps and in different rooms/different setups but tonight I was messing with cables and it went away in all of my amps except one fp10k. I changed all cables from one clone that didn't hum to other and the same clone kept the hum with the opposite amps cables and wires. I have them stacked in a rack, top one has kept the hum, and there is a mini dsp on top of the one with a hum. I switched power outlets too. Any ideas? There is a new plug on the end that I triple checked when hooked it up but don't know what else to do. Is there a way to find what is causing it since cable management didn't cure it.
post #2585 of 4389
Quote:
Originally Posted by audiovideoholic View Post

I've had a hum every since I started using pro amps and in different rooms/different setups but tonight I was messing with cables and it went away in all of my amps except one fp10k. I changed all cables from one clone that didn't hum to other and the same clone kept the hum with the opposite amps cables and wires. I have them stacked in a rack, top one has kept the hum, and there is a mini dsp on top of the one with a hum. I switched power outlets too. Any ideas? There is a new plug on the end that I triple checked when hooked it up but don't know what else to do. Is there a way to find what is causing it since cable management didn't cure it.

If I unhook the inputs but turn the amp up with the speakers still connected will this test to see if it's the amp or something else in the chain causing the problem?

Amp on with speakers only with no hum = not the amp
Amp on with speakers only with hum = amp

Would these two work to test it or would the amp need input to produce hum if it's truly the amp?
post #2586 of 4389
Quote:
Originally Posted by audiovideoholic View Post

I've had a hum every since I started using pro amps and in different rooms/different setups but tonight I was messing with cables and it went away in all of my amps except one fp10k. I changed all cables from one clone that didn't hum to other and the same clone kept the hum with the opposite amps cables and wires. I have them stacked in a rack, top one has kept the hum, and there is a mini dsp on top of the one with a hum. I switched power outlets too. Any ideas? There is a new plug on the end that I triple checked when hooked it up but don't know what else to do. Is there a way to find what is causing it since cable management didn't cure it.

If the hum follows the amp and nothing else has it, then yeah the amp is defective.

everything in system = hum
everything in system but the problem amp = no hum
swap two identical amp spots: no hum vs with hum.
if hum follows, amp is problem; otherwise it's upstream or downstream (DAC/wiring or speakers etc).
post #2587 of 4389
Quote:
Originally Posted by BassThatHz View Post

If the hum follows the amp and nothing else has it, then yeah the amp is defective.

everything in system = hum
everything in system but the problem amp = no hum
swap two identical amp spots: no hum vs with hum.
if hum follows, amp is problem; otherwise it's upstream or downstream (DAC/wiring or speakers etc).

The whole system except the avr surrounds had a hum. Straightened/rerouted some cables and all went away except the one clone. I then switched all the cables and subs from the nonhummer to the hummer and it continued to hum. Will it produce a hum without an input (only speakers and power going to it) though if it's the amp?

If is faulty will take it to a shop about an hour away in hopes of repair. Would I need specific parts from Johnson or should they be able to fix it by sourcing parts?
post #2588 of 4389
Quote:
Originally Posted by audiovideoholic View Post

The whole system except the avr surrounds had a hum. Straightened/rerouted some cables and all went away except the one clone. I then switched all the cables and subs from the nonhummer to the hummer and it continued to hum. Will it produce a hum without an input (only speakers and power going to it) though if it's the amp?

If is faulty will take it to a shop about an hour away in hopes of repair. Would I need specific parts from Johnson or should they be able to fix it by sourcing parts?

and when you switch it back to the nohummer it goes away(?) I assume...
If that is the case, then it is the amp.
Especially if no matter where it goes, the hum goes with.

Is that what that 85db 60hz peak was in your system?

If it is just a few components they "might" be able to swap it for like-values, for major stuff Johnson will have to supply all the parts.
post #2589 of 4389
Most likely just needs a tad beefier ground wire.. Or had a bad ground to begin with.. the (hummer)
post #2590 of 4389
Quote:
Originally Posted by BassThatHz View Post

and when you switch it back to the nohummer it goes away(?) I assume...
If that is the case, then it is the amp.
Especially if no matter where it goes, the hum goes with.

Is that what that 85db 60hz peak was in your system?

If it is just a few components they "might" be able to swap it for like-values, for major stuff Johnson will have to supply all the parts.

Yeah. That peak was from the hum.
post #2591 of 4389
Quote:
Originally Posted by Jason kiDD View Post

Most likely just needs a tad beefier ground wire.. Or had a bad ground to begin with.. the (hummer)

Inside the amp? I have massive plug on it (220v). If its inside the amp can you point it out from any of the pics posted in the thread. I can solder if that is the case.
post #2592 of 4389
Quote:
Originally Posted by audiovideoholic View Post

Inside the amp? I have massive plug on it (220v). If its inside the amp can you point it out from any of the pics posted in the thread. I can solder if that is the case.

Did you get one of the newer versions with the 10awg wire?
post #2593 of 4389
Quote:
Originally Posted by Jason kiDD View Post

Did you get one of the newer versions with the 10awg wire?

I dont know. The wire with shield and plastic coating is aprox 3/4" dia or so if had to guess. Its rather large. Purchased around second quarter 2012.
post #2594 of 4389


Lost a channel this weekend. Mute and temp light lit up.. Wasnt playing music had just powered amp on. I believe a loose speaker cable to be the culprit.. In any case will open it up this coming weekend and see whats what.. Good thing i have more than one.. cool.gif
post #2595 of 4389
Quote:
Originally Posted by Jason kiDD View Post



Lost a channel this weekend. Mute and temp light lit up.. Wasnt playing music had just powered amp on. I believe a loose speaker cable to be the culprit.. In any case will open it up this coming weekend and see whats what.. Good thing i have more than one.. cool.gif

What do you mean by loose speaker cable? did you accidentally short the channel of the amp?
post #2596 of 4389
Yeah the wire came loose in the neutriks connector and could have possibly touched each other.. Again ill open it up this coming weekend and take a look. Channel 1 works fine and passes audio..
Edited by Jason kiDD - 3/10/13 at 10:56pm
post #2597 of 4389
Quote:
Originally Posted by Jason kiDD View Post



Lost a channel this weekend. Mute and temp light lit up.. Wasnt playing music had just powered amp on. I believe a loose speaker cable to be the culprit.. In any case will open it up this coming weekend and see whats what.. Good thing i have more than one.. cool.gif

Jason - Had the exact same thing happen to me recently. Had a connector come loose on one of my subs and shorted. Wound up blowing the fuses on the amp board. One tip - Be VERY careful about letting the caps discharge before you change the fuses. I waited about 10-15 minutes which apparently was not enough. It was a stupid mistake not to check voltage first but I (incorrectly) assumed they wouldn't hold a charge that long. I wound up replacing the power supply board which was not a simple job.
Edited by Gorilla83 - 3/11/13 at 5:44am
post #2598 of 4389
Yeah im giving it a week no rush since ill be doing other projects in the interim. But thanks for the heads up..
post #2599 of 4389
Quote:
Originally Posted by Jason kiDD View Post

Yeah the wire came loose in the neutriks connector and could have possibly touched each other.. Again ill open it up this coming weekend and take a look. Channel 1 works fine and passes audio..

Quote:
Originally Posted by Gorilla83 View Post

Jason - Had the exact same thing happen to me recently. Had a connector come loose on one of my subs and shorted. Wound up blowing the fuses on the amp board. One tip - Be VERY careful about letting the caps discharge before you change the fuses. I waited about 10-15 minutes which apparently was not enough. It was a stupid mistake not to check voltage first but I (incorrectly) assumed they wouldn't hold a charge that long. I wound up replacing the power supply board which was not a simple job.

Aye... I think I had a close call yesterday with this same issue. I noticed a few subs weren't playing, looked behind my amp to see one of my bananna plugs had rattled loose. Luckily for me it was a the plug closest to the ground, so it just fell on the floor without touching the other terminals.

I thought about you guys when I saw it!eek.gif

I'm going to have to find a different way to secure the speaker wire or find a totally vibration free surface/environment for the amp(s).
post #2600 of 4389
^Mine was caused the terminal on the sub vibrating loose. With that much constant SPL, things are bound to get shaken up. I'm pretty sure I'm going to have to move to Speakons.
post #2601 of 4389
Mine are actually speak-on but its the same thing. Over time you have to check the connectors.. Especially when using 10awg speaker wire.. eek.gif
post #2602 of 4389
Quote:
Originally Posted by Jason kiDD View Post

Mine are actually speak-on but its the same thing. Over time you have to check the connectors.. Especially when using 10awg speaker wire.. eek.gif

Wait? I didn't think that would be possible with speak-ons? At least a short from two terminals touching and causing a short?

I get that they can rattle loose, but they are plastic...
post #2603 of 4389
Read through most of the thread. Ordered an FP14000 120v yesterday. Hope I get a good one. Anything in particular to check when I get it beyond it turning on and working?
post #2604 of 4389
Quote:
Originally Posted by popalock View Post

Wait? I didn't think that would be possible with speak-ons? At least a short from two terminals touching and causing a short?

I get that they can rattle loose, but they are plastic...

Once a wire comes loose and shakes out the sleeve then it is possible to make contact with another wire in sleeve. Both wires came out thou which is makes it more likely so. On the speaker end not the amp end..
post #2605 of 4389
Quote:
Originally Posted by Jason kiDD View Post

Once a wire comes loose and shakes out the sleeve then it is possible to make contact with another wire in sleeve. Both wires came out thou which is makes it more likely so. On the speaker end not the amp end..

Ah, I see... Makes total sense.

BLUF: Keep an eye on both ends.

Thanks Jason
post #2606 of 4389
It's easy. Strip the wire, shove it into the hole, screw it down. Actually at one point I had just shoved the 'naner plugs into the side hole and screwed the terminal down there, but a lot of nicer brands probably don't fit.
post #2607 of 4389
This sucks, I sold my perfectly working FP14K and it seems I need it! I guess I have to buy another.
post #2608 of 4389
Quote:
Originally Posted by MKtheater View Post

This sucks, I sold my perfectly working FP14K and it seems I need it! I guess I have to buy another.

I'll bite.

Gee whiz MK, why on earth would you nwed a new FP14K?

I remember your eD subs were for sale too. Did you end up offloading them as well?
post #2609 of 4389
I still have them but they maybe going through a transformation.
post #2610 of 4389
Quote:
Originally Posted by MKtheater View Post

I still have them but they maybe going through a transformation.

4 of Ricci's updated GH's?

Tell me I'm wrong...lol

Sorry for getting off topic. New thread with the updates coming MK?
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: DIY Speakers and Subs

Gear mentioned in this thread:

AVS › AVS Forum › Audio › DIY Speakers and Subs › Lab Gruppen FP14000 clone amplifiers