HELP! 250TI distortion/feedback...

[Storm]

Argh. Don't know where to turn, so I will ask a question here.

I have my 250TI's setup and they were all good and running until I could hear feedback/distortion when all music is turned off through the tweeters.

I removed the audio cable that was connected to the amp to the preamp and the distortion was removed. I then replaced the cable with a different one, but the feedback is still there, loud and clear.

What the heck am I doing wrong?



Thanks, guys.

-Storm.

[johnaec]

By feedback, so you mean a loud squeal? If removing the cable between preamp and amp deletes it, then obviously, the problem is ahead of the speakers and amp, and should have nothng to do with the 250's... Is it possibly microphonics from a turntable cartridge?

John

[Storm]

Not a squel - a tiny buzzing sound...

No turntable in the system.

Just the amp, preamp, and the power conditioner, along with a CD player and a DirecTv tivo system.

Argh.

-Storm.

[SMKSoundPro]

is it coming from the tivo device? I have a horrible time with the catv converters at the bar. They induce all sorts of noisy stuff, ground hums...etc.

I have used 1:1 transformers with good luck.

Now if only the music service on the cable tv system was good quality! It is so compressed and thin and the sound of it drives the customers right out the door. The bartenders dont seem to mind as less customers mean less work...ARGH!

Seriously Storm, unplug any video stuff from your preamp to see if that chases down the offending noise.

I am SURE someone else will chime in to help. They always do.

Good luck.
Scott.

[sourceoneaudio]

The buzzing is A/C related. Did you just add the TiVo/Direct box? If so that could be the issue. Same as b4 with that Mac preamp, you have an A/C hum and it is being picked up by something. Is the TiVo box sitting on top of your TV, or close to it? Your TV is a noisy issue remember b4.

Another check, does it still do it with the TV off?

I helped another person with the same issue, and it was TV/Video related. He also had a CRT tube TV. (RADIATING NOISE FROM TUBE)

One other fix. You can try tying the gold ground tab/lug on the back of the Monster to the gold phono ground on the CA-5AII. Use a no: 10 wire with crimped on eyelets.

Time for a flat panel..............

Jeff
J/S-S1A

[Titanium Dome]

I don't run any external video cables into my system anymore, as they always introduce unwanted noise, whether one can hear it or not. It was impossible to avoid line noise unless I lifted the ground, risking death and destruction, or ran the cable through a Monster unit. (Yes, I'm writing that there was an audible AND visible difference.)

In any event, when I went HD, I bought a lowly Zenith Silver Sensor antenna and a Samsung SIR451 OTA Terresrtral HD receiver. I ran the analog RGB signal straight through to the CRT PJ and the optical audio out to the FAP T1+. With the passive, unamplified antenna, there's no grounding or other issues. The picture is crystal clear and the audio is much, much improved over cable or satellite. And I still have more channels than I can watch.

[boputnam]

When troubleshooting -
Look at the system as a stream ( or as a line) - Assume NOTHING.

Start in the middle...

Almost perfect...

Start with ONLY the amp. Disconnect everything.
Turn the amp on, no inputs from anywhere - any noise?

Power down.

Connect the pre-amp, with nothing connected to it.
Power-up the amp and pre-amp - any noise?

Now, one by one, connect your input devices - try one at a time, and disconnect it if it is not the noise source.

Also, is everything on the same AC edison plug? If not, run an extension cord from the TV pile-of-crap to the audio racks - see if this remedies the symptom(s). If so, you will need to run everything to the same AC outlet. Been there, doing this...

[WDJ]

What was the last thing you added/changed/did to the system before the offending noise showed up?

If your electrical plugs are not polarized, try flipping them over and reinserting them.

[Storm]

It must be the TV.

There is a slight buzz, but when I am 10 feet back -- cannot hear a thing.

Oh well, guess I need to save up for a plasma?



-Storm.

[boputnam]

It must be the TV.

There is a slight buzz, but when I am 10 feet back -- cannot hear a thing.

TRY this...

Also, is everything on the same AC edison plug? If not, run an extension cord from the TV pile-of-crap to the audio racks - see if this remedies the symptom(s). If so, you will need to run everything to the same AC outlet. Been there, doing this...

[opimax]

also try it w and w/o the surge/power supply

[sourceoneaudio]

Another 2 cents:

Storm,
You had the noise with the Mac preamp, and Nak. amp combo, and this was when the Mac preamp was very close to the Tube TV. You moved the Mac up a shelf and still had the noise. Then you swapped out the Mac for a Nak. preamp, and the noise was gone.

You still did not answer the question, is the
Direct Box a new addition?

Have you tried removing it from the system to see if the noise goes away if it is a new addition?

Have you shut the TV off, and did it go away?

If you have tried all of the above then I would say the TV is heading further south for the winter.

[Storm]

Nope, the directv box is not a new addition.

What TV do I get that won't interfere with the speakers?

Thanks.

-Storm.

Another 2 cents:

Storm,
You had the noise with the Mac preamp, and Nak. amp combo, and this was when the Mac preamp was very close to the Tube TV. You moved the Mac up a shelf and still had the noise. Then you swapped out the Mac for a Nak. preamp, and the noise was gone.

You still did not answer the question, is the
Direct Box a new addition?

Have you tried removing it from the system to see if the noise goes away if it is a new addition?

Have you shut the TV off, and did it go away?

If you have tried all of the above then I would say the TV is heading further south for the winter.

[hjames]

Nope, the directv box is not a new addition.

What TV do I get that won't interfere with the speakers?

Thanks.

-Storm.

TV doesn't interfere with speakers - but a picture tube can have a large magnetic field that can be picked up by other things.

But before you buy a New TV you might want to follow the tests Bo and I posted and be sure its the TV picture tube. If its a ground problem from Satellite or cable and you buy a new TV you will still have the noise, but be out the $$

[opimax]

If you did any of the suggestions could you post results of the individual tests?

Mark