Feedback through turntable

Coupling a component to a vibrating surface isn’t "isolation". As a turntable manufacturer I have a pretty good idea of what works, however there are many variables and results can be unpredictable. I consider direct coupling methods as "tuning" devices. Isolation devices I feel offer a more accurate window into what the product was designed for. Also my footers are adjustable and can couple or isolate according to customers desires.  Any method that increases your listening pleasure is the correct choice! 

Going on the advice of "How to Get Better Sound", I placed my TT platform on the side wall about 3 feet from my left speaker. Because my sound room is on the second floor and I have a suspended floor, I built a suspended platform, out from my wall using appliance springs and tie-down straps/metal cables, so it basically "floats." This worked great, until I added another JL Fathom 13 sub. I couldn’t even turn the subs on, due to low frequency feedback that would build on itself. I tried the inner tube trick, the sandbox trick-everything I could think of to no avail. I finally moved my turntables to between the speakers. I’m sure, some of you are thinking-what a moron-everyone knows that and I would agree. It took me several trial and error positions, to find this place, where no room nodes are effecting the playback. I think in the long run, acoustical energy has a huge effect, on the playback, specially at high volume levels. As far as cones go, I was a skeptic. I have a Theta Miles CD player I dearly love and only use analog outs on it. I had to utilize thick foam, so the low frequency would not effect the playback. (too much low frequency for the room size) I placed four cones, one under each corner of the CD player and was amazed to not have anymore low frequency pick-up. Maybe I will try just three cones in the future. I know you said you can’t move your equipment, but as mentioned above, sometimes just a little change, can have a huge effect on your sound. Room nodes can be neutralized some, with room treatment. As a matter of fact, I think proper room treatment, used in the proper way, will give most of us better sound, than an equipment upgrade. I’m a believer in Dennis Foley’s technique and products. If you haven’t tried them, or are not familiar with them, go to his web sight "Acoustic sounds." 

Thank you for your honest response.

Sorry to say that after all of the info I/we provided.some like toddverone chose to post their resulting info on another thread.

The OP never responded.... Toddverrone took the info and ran somewhere else.

I'm not getting a good vibe???

Sorry I took the time.

handymann
 I think proper room treatment, used in the proper way, will give most of us better sound, than an equipment upgrade.

May just have something along those lines engraved on my headstone.

In my book one of if not the most overlooked things that should
be undertaken, the earlier the better. 

The disadvantage being it lessen's the frequency of changing out gear,
tough choice that it is. 


 

@slaw dude, chill. I’ve had a busy weekend and I just finished installing the springs on Thursday, so I’ve hardly had time to report back. I didn’t realize thread loyalty was a thing.

I bought some 2" compression springs with a spring rate of ~9lbs/inch from Grainger. I then drilled 4 holes in the bottom of my maple butcher block platform approximately 3/4" deep and installed the springs in the holes. To protect my furniture, I put cork discs under the springs.

I also finished mounting the tt motor on the butcher block. I still had the motor circuit board attached to the tt plinth, which made moving it a pain the ass.

So far I like the sound of the butcher block on springs better than on the inner tube. As far as leveling/ mass loading, my butcher block is 2" thick and plenty heavy, especially when the tt is on it. When I drilled the holes for the springs, i made sure they were as equal in đepth as possible. That, combined with the self leveling nature of springs has made leveling a non issue. I also thought of using three springs, but it was too wobbly when I tested it.