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Lab Gruppen FP14000 clone amplifiers - Page 89

post #2641 of 4387
Well, my FP10k has a hum that is deffenantly internal problem or main power wire problem. Whole system had a hum but eliminated it from all 3 other amps and now just have it coming from one fp10k.

Any ideas on where to start other than email Johnson? Someone mentioned the power wire earlier but never elaborated on it.

Will add that the hum increases in volume with gain knobs on the front and the gain switches on the back.

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post #2642 of 4387
Ok, just for the guys that want to know. You email Sanway and they send you an invoice for what you want. Then you send them money through PayPal and hope for the best.

Do you guys mess with the settings on the amps at all? The two I owned I set the gain to max, vpl to 120 v, and hard and I never had a problem.
post #2643 of 4387
Ok, just for the guys that want to know. You email Sanway and they send you an invoice for what you want. Then you send them money through PayPal and hope for the best.

Do you guys mess with the settings on the amps at all? The two I owned I set the gain to max, vpl to 120 v, and hard and I never had a problem.
post #2644 of 4387
Got my FP14000 today. Looks good. No scratches / dent and the packaging was solid.

Turns on fine, tested both channels with no issues.

Quick question:

If I wanted to use this on my DTS-10 until I finish the Gjallarhorns I would need to wire the drivers in a series (with one out of phase) for an 8 ohm load? Both in parallel would be 2ohms which is no go right?

Thanks!
post #2645 of 4387
Quote:
Originally Posted by dsl1 View Post

Got my FP14000 today. Looks good. No scratches / dent and the packaging was solid.

Turns on fine, tested both channels with no issues.

Quick question:

If I wanted to use this on my DTS-10 until I finish the Gjallarhorns I would need to wire the drivers in a series (with one out of phase) for an 8 ohm load? Both in parallel would be 2ohms which is no go right?

Thanks!

Yes, run them in series for a 8ohm load on a single channrl. Should be well inline with what Ricci revommends on data-bass.

What were you running your DTS-10 with before you got the Clone?
post #2646 of 4387
Quote:
Originally Posted by dsl1 View Post

Got my FP14000 today. Looks good. No scratches / dent and the packaging was solid.

Turns on fine, tested both channels with no issues.

Quick question:

If I wanted to use this on my DTS-10 until I finish the Gjallarhorns I would need to wire the drivers in a series (with one out of phase) for an 8 ohm load? Both in parallel would be 2ohms which is no go right?

Thanks!

Correct.

Edit
Was taking dogs out and was answered already lol
post #2647 of 4387
Quote:
Originally Posted by popalock View Post

Yes, run them in series for a 8ohm load on a single channrl. Should be well inline with what Ricci revommends on data-bass.

What were you running your DTS-10 with before you got the Clone?

Okay cool thanks

EP4000 in bridge mode with one channel to each side.
post #2648 of 4387
Well, I've gotten two responses from Johnson about the amp producing a hum.

Here is the email I sent him and the responses.

From me, "My FP10k has a hum that is coming through the speakers. It increases in volume if turn the gain knobs on the front up and also increases if use higher gain settings on the back of the amp.
I have trouble shot the amp with wires from my other FP10k that does not have a hum. It is the amp and not the cables."

First response, "When you turn on the FP10000Q, and input with signal, the front panel VPL is on. also the output signal is distorted, Right?

My response, "No nothing unusual with VPL or any distortion. Just a 60hz type of hum that will not go away with cable management. Everything else is fine other than the hum to my knowledge. Plays fine and all lights work correctly. I'm using all four channels."

His second response, "Please disconnect the input signal, only connectwith power cable and output cable. Then check that the problem is from amplifier or amplifier again?"

My response, "It doesnt make any sounds without input cables. All inputs produce a hum whether I use 1 input or all 4. I have 2 FP10ks and have changed input cables to eliminate them being faulty. It produces the hum with any input cable I have tried."




Is there some chance that the hum could go away if I used phoenix out of the mini to the xlr inputs of the amp even if I have tried cables that work fine with the other clone?
post #2649 of 4387
u might as well try u could also try floating the ground from the mini dsp to the amp see if that fixs the problem
post #2650 of 4387
Quote:
Originally Posted by cookieattk View Post

u might as well try u could also try floating the ground from the mini dsp to the amp see if that fixs the problem

How do I float the ground on the RCA/ 4 xlr cable? I'll give it a try if it doesnt ruin the cable. And may even if it does as they are only around $50
post #2651 of 4387
Thread Starter 
Just use phoenix to XLR, phoenix has a ground. I also run balanced from my receiver to my minidsp, using the chassis ground from the amp. You've confirmed one of your amps doesn't hum, but the other does. When you moved input cables did you also make sure to plug the amp that hums into the same outlet as the one that doesnt?
post #2652 of 4387
Quote:
Originally Posted by audiovideoholic View Post

How do I float the ground on the RCA/ 4 xlr cable? I'll give it a try if it doesnt ruin the cable. And may even if it does as they are only around $50

Ideally your adapter cable would be made as shown in example 17, Rane Sound System Interconnection, except apparently(?) having four XLR plugs connected in parallel to the RCA.
Edited by whoaru99 - 3/19/13 at 5:45am
post #2653 of 4387
Quote:
Originally Posted by notnyt View Post

Just use phoenix to XLR, phoenix has a ground. I also run balanced from my receiver to my minidsp, using the chassis ground from the amp. You've confirmed one of your amps doesn't hum, but the other does. When you moved input cables did you also make sure to plug the amp that hums into the same outlet as the one that doesnt?

Thats an affirmative. i've switched everything possible including speakers, power outlet, cables, and input cables.
post #2654 of 4387
Now Johnson says that it is a source issue and not the amp.
post #2655 of 4387
Thread Starter 
hook up a portal mp3 player to it, use headphone out to whatever input on the fp14k. see if it still buzzes, that will rule out ground loop.

If your issue is @ 60hz, it's most likely not the amp, but who knows.
post #2656 of 4387
Quote:
Originally Posted by notnyt View Post

hook up a portal mp3 player to it, use headphone out to whatever input on the fp14k. see if it still buzzes, that will rule out ground loop.

If your issue is @ 60hz, it's most likely not the amp, but who knows.

Sounds like a good idea! Just weird how it hums with any cable I hook up to it. The hum follows the amp no matter what. This should be last test and then will be looking at what, power wire issues or input issues on the amp itself?
post #2657 of 4387
Thread Starter 
if it still hums, not connected to anything but speakers and a source not connected to your electrical system, the amp most likely has an issue.
post #2658 of 4387
Try a 3 prong adapter to lift the ground and see if it goes away. If you have cable or satellite lines hooked up to your display or reciever , unplug them . If that don't work, then the amp is the problem.
post #2659 of 4387
Quote:
Originally Posted by Dezmond View Post

Try a 3 prong adapter to lift the ground and see if it goes away. If you have cable or satellite lines hooked up to your display or reciever , unplug them . If that don't work, then the amp is the problem.

I can't lift the ground on my power since its 220v twist plug/outlet. I have tried running the amp without dtv, bd player, etc... It very well my not like my avr for all I know but it hums with any input plugged into a power source as I tried nots mp3 inputs.....

I hooked up my phones headphone out and played audio just fine. So guess need to order some cables to run balanced Phoenix to balanced in on the FP and see what happens.

Is that the next step?
post #2660 of 4387
Thread Starter 
Quote:
Originally Posted by audiovideoholic View Post

I can't lift the ground on my power since its 220v twist plug/outlet. I have tried running the amp without dtv, bd player, etc... It very well my not like my avr for all I know but it hums with any input plugged into a power source as I tried nots mp3 inputs.....

I hooked up my phones headphone out and played audio just fine. So guess need to order some cables to run balanced Phoenix to balanced in on the FP and see what happens.

Is that the next step?

I run balanced from my AVR to minidsp using the ground terminal on the avr. then balanced phoenix from minidsp to xlr on the amps. That should keep your common ground signal equal and remove the hum. worked for me.
post #2661 of 4387
Quote:
Originally Posted by notnyt View Post

I run balanced from my AVR to minidsp using the ground terminal on the avr. then balanced phoenix from minidsp to xlr on the amps. That should keep your common ground signal equal and remove the hum. worked for me.

Might as well ask as I didn't understand what you meant when post that earlier about chassis ground on avr. How do I do that from avr to mini?
post #2662 of 4387
My amp came in today, I will hook it up later.
post #2663 of 4387
Thread Starter 
Quote:
Originally Posted by audiovideoholic View Post

Might as well ask as I didn't understand what you meant when post that earlier about chassis ground on avr. How do I do that from avr to mini?

On the left side near the speaker cables, you can see Signal GND. I used RCA cables and ran another wire with them for that. Many amps will have something like that, otherwise you can probably just ground to the chassis.


post #2664 of 4387
Ok. Found it on the denon4311. So RCA out just like normal from avr add a wire (in my case multiple wires. Is that fine for the Phoenix inputs to all share the ground even though they are different signals?) to the ground. Then cut other end of RCA to go into the S-Positive- Negative on the mini. Which wires go to each?

Thanks Not

Edit,

I got it I think. Didnt realize the wires inside RCAs were black and red. I'm going by a standard xlr wiring diagram to hard wire the out to the clone.

Since I have 4 inputs on the clone but will either be using xlr splitters or some other type of splitter will each input on the clone recieve 8vrms from the mini or will that be split up to 2 volts for each input. Bosso was explaining how I need to lower the switch on the back of the clone and turn the dial up on the front for optimal performance depending on the different voltages the amp sees.
Edited by audiovideoholic - 3/21/13 at 7:56pm
post #2665 of 4387
Quote:
Originally Posted by MKtheater View Post

My amp came in today, I will hook it up later.
Hope everything works out.
post #2666 of 4387
Quote:
Originally Posted by audiovideoholic View Post

Ok. Found it on the denon4311. So RCA out just like normal from avr add a wire (in my case multiple wires. Is that fine for the Phoenix inputs to all share the ground even though they are different signals?) to the ground. Then cut other end of RCA to go into the S-Positive- Negative on the mini. Which wires go to each?

Thanks Not

Edit,

I got it I think. Didnt realize the wires inside RCAs were black and red. I'm going by a standard xlr wiring diagram to hard wire the out to the clone.

Since I have 4 inputs on the clone but will either be using xlr splitters or some other type of splitter will each input on the clone recieve 8vrms from the mini or will that be split up to 2 volts for each input. Bosso was explaining how I need to lower the switch on the back of the clone and turn the dial up on the front for optimal performance depending on the different voltages the amp sees.

Ideally your adapter cable would be made as shown in example 17, Rane Sound System Interconnection, except apparently(?) having four XLR plugs connected in parallel to the RCA.

In the parallel circuit of the "Y" cable/splitter, the voltage at the input end of the "Y" be equally applied to all the outputs of the "Y".
post #2667 of 4387
Thread Starter 
Quote:
Originally Posted by audiovideoholic View Post

Ok. Found it on the denon4311. So RCA out just like normal from avr add a wire (in my case multiple wires. Is that fine for the Phoenix inputs to all share the ground even though they are different signals?) to the ground. Then cut other end of RCA to go into the S-Positive- Negative on the mini. Which wires go to each?

Thanks Not

Edit,

I got it I think. Didnt realize the wires inside RCAs were black and red. I'm going by a standard xlr wiring diagram to hard wire the out to the clone.

Since I have 4 inputs on the clone but will either be using xlr splitters or some other type of splitter will each input on the clone recieve 8vrms from the mini or will that be split up to 2 volts for each input. Bosso was explaining how I need to lower the switch on the back of the clone and turn the dial up on the front for optimal performance depending on the different voltages the amp sees.

Why are you using splitters? Just use an XLR jumper
post #2668 of 4387
post #2669 of 4387
Thread Starter 
That doesn't help from minidsp to receiver
post #2670 of 4387
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