Receiver issue or Speaker issue? KLH 33's Vs MCS 3222

[Soniciguana]

So this weekend I picked up a Nice pair of KLH 33s for $100, They seem to be in great shape, except for one loose terminal that was a easy fix, Just pulled the woofer out and tightened it up. The previous owner had a set of 17's for sale too but I fell for the look and Sound of the 33's. He set up a demo for me and they played perfect. I got them home, hooked them up put on a record and cranked them up, all of a sudden the Left Channel Woofer starts vibrating super fast (sounded like a helicopter). Turned down the volume, and it went away. Tried again, Switched the speakers to see if it was the one I opened up and turns out its only on the left channel! Further experimentation revealed it goes away when I switch the receiver (MCS 3222) from Stereo to Mono. Anyone got any ideas?? Im stumped! This was not a issue with my old crappy BSR Bookshelf's I had on there up until now

 

[goodolpg]

Did you try any other source besides the turntable?
If it was only with the turntable then it might be a matter of vibration/isolation.
Could be the turntable is not isolated as well as it should be, depending on many factors. Such as, too close to a speaker, too loud of volume/bass settings, lid open or shut and more I can't think of at this moment.
If it happened with other sources like a tuner or cd player it could be a totally different issue, quite possibly with the receiver. Do you have another receiver you could try those speakers with?

BTW, just so you know, duplicate threads are not allowed here.

 

[Soniciguana]

Did you try any other source besides the turntable?
If it was only with the turntable then it might be a matter of vibration/isolation.
Could be the turntable is not isolated as well as it should be, depending on many factors. Such as, too close to a speaker, too loud of volume/bass settings, lid open or shut and more I can't think of at this moment.
If it happened with other sources like a tuner or cd player it could be a totally different issue, quite possibly with the receiver. Do you have another receiver you could try those speakers with?

BTW, just so you know, duplicate threads are not allowed here.

Thanks for the help. Im going to try this, Unfortunately the room set up kind of requires the speakers to be close to the TT but I'm going to try it with other sources, right now all I have is a turn table hooked up to it but ill try putting my phone on the AUX port. And thanks for the heads up. next time I'll make sure to delete the other post first.

 

[goodolpg]

You're on the right track by switching speakers as you (we) need to isolate some possibilities.
If you can, try the phone through the aux, if the left speaker still acts up that would most likely rule out the tt.
Smart folks here, if it does turn out the receiver is at fault hopefully they can help guide you through some more testing.
I'm limited in knowledge of the internal things, but I always try cheap and easy fixes first.

 

[cademan]

It sure sounds like your classic turntable rumble. Use a subsonic filter if your amp/receiver has one or else move your speakers farther away from the turntable or turn the bass down or don't turn it up so loud that it starts doing it again.

 

[goodolpg]

OP said " Tried again, Switched the speakers to see if it was the one I opened up and turns out its only on the left channel! "
That points towards the receiver but I'd still try another source if possible, the phone would be fine.

 

[Soniciguana]

It sure sounds like your classic turntable rumble. Use a subsonic filter if your amp/receiver has one or else move your speakers farther away from the turntable or turn the bass down or don't turn it up so loud that it starts doing it again.

My Receiver doesn't have a subsonic filter, but I see they sell inline ones correct? Any Recommendations?

 

[goodolpg]

Since the receiver has not been ruled out yet I'd wait, just in case your receiver needs repair or you decide whether a new receiver would make more sense than repairing the one you have now.
For now, you could just try playing a record with the bass or loudness turned down and see if the speaker still "flutters".

 

[Soniciguana]

UPDATE:
After some more experimenting it seems to be turntable rumble. Certain albums (base heavy) seem to do it more than others. (Abby Road & Allmans Live at Fillmore) I have also noticed that I can trigger it by stepping with a heavy foot near the turntable (Creating more vibrations). It seems to only be in the Left Speaker because, what I am assuming, the mixing of the records seem to favor a more bass heavy left channel. I was experimenting with the Balance slider and noticed quite a difference in the left channel vs right channel. I also noticed it would stop doing it if I switched the receiver from Stereo into Mono Mode. These are just my observations so I might be way off. The next step is to work on Vibration Mitigation for the TT

 

[goodolpg]

Progress!
If you're convinced it's a vibration/isolation issue work on getting the turntable isolated. That can be done many ways. One of the easiest besides moving the turntable to a more secure, isolated surface, might be isolation devices. My turntable would sometimes skip as walked nearby, maybe I should say as a lumbered by. I used sorbothane half spheres under my tt and it cured the problem. Some don't like those as they can stick to the surface they are placed on but ones with a coating or layer of something on the bottom can alleviate that. Here are some relatively inexpensive items, there are many more. https://www.audioadvisor.com/products.asp?dept=66

Now it might be time to look into a subsonic filter. No recommendations, hopefully others can offer suggestions. Or just get a different receiver. Yeah, we're a bunch of audio enablers here...

ADDED--one other thought, when playing records do you keep the turntable dust cover closed? For some reason playing records with the dust cover up/open seems to be fashionable in some circles. JMO that could make the dust cover pick up vibrations making it act in a microphonic (ringing?) manner which could then transfer those vibrations to the arm/stylus and causing fluttering.

Abbey Road, I was amazed at the amount of bass the very first song, Come Together has. I got the stereo box set (CD) when it was released, I never had the vinyl record, may have had Abby Road and a compilation cd but I'm rambling now. Anyways the bass just blew me away. But then I also have better speakers and a subwoofer now that I didn't have back in the day.