Eminent Technology ET-2 Tonearm Owners

I haven't yet taken the time to re-post my virtual system but I've had some interesting findings.

This should be interesting to you all, I hope it doesn't seem all about me, even though it really is.

My tt is a wall mount. Sadly, it's not on a load bearing wall. I've done my best to compensate, I have a MANA (custom) wall mount as the basis for the tt, (also a separate one for the outboard motor, thread drive), I've made a custom motor enclosure that, after hearing the positive benefits, I've already decided to construct another. I'm using a combo of Symposium platforms and BDR shelves. I use a ET 2.5, currently running 17psi @ the arm, a Dyna 17D3. (I think this cart weighs around 5 grams).

What I'm getting at is this, I've had an issue where if the cartridge is sitting in the groove, tt not spinning volume up!, I'd get a low frequency rumble. This could be several things, and I've tried several things.

I recently purchased a double leaf spring I-beam, re-read the manual and my (2) counterweights are now at the end of the I-beam. To my surprise, performing the cart in the groove test now results in NO rumble. Hallelulia! Now I'm going to play Ryan Bingham's excellent "Hallelulia"



Recently I purchased a double leaf spring I-beam

****I recently purchased a double leaf spring I-beam, re-read the manual and my (2) counterweights are now at the end of the I-beam. To my surprise, performing the cart in the groove test now results in NO rumble. Hallelulia! **** -Slaw

Hah!

Frogman. Is your "Hah"! a good thing or not so good thing.

I still think that my new motor enclosure design will help.
I also realize that this fix may be somewhat a 'bandaid fix' towards other potential issues. In any case, I'm enjoying the problem being gone for now.

Slaw, sorry I wasn't clear. My Hah! is definitely a good thing! It was an exclamation intended to be an acknowledgment of and agreement with your findings. It was also a bit of a pat on the back (my own back, and hopefully not too arrogant on my part) since I pointed out the benefits of the double-leaf spring and of moving the weight as far out on the I-beam as possible a while back.

I am very glad that you were able to solve the rumble problem. Like you I have my table on a non-load-bearing wall shelf. I used to have it on a rack and had terrible issues because of springy floor. While the move to the wall shelf solved some problems it created others. I constructed a multiple-layer constrained-layer platform that the table sits on on the shelf and it works very well. Overall, it is a better solution than on the rack.

BTW, I love your idea of using a common or agreeable LP as a reference to discuss our findings with out ET2/cartridge set-ups.

Regards.

Chris, my Acutex 420 STR has continued to improve and after a couple of months of exclusive use it seems to be settling at a point where the only harshness heard is harshness that occurs naturally in music. I think this has got to be one of the greatest bargains in my experience. I am not prepared to say that it bests my Empire 4000DiiiGold in every respect, but while the Empire (in my set-up) tends to gloss over some of music's natural aggressiveness and nasties, the Acutex doesn't err nearly as much in the direction of being overly aggressive up top. It is also more natural in the dynamics dept. It is sounding very very good on the ET.