Subsonics with Grado & Rega Arm

I don't get hum it's definetly subsonic vibration which is why I'm inquiring about tonearms that are compatable with the wooden grados and perform as good or better than my modded RB300

Hi SdCampbell

Thanks for your reply. I did consider that as a possiblity but quickly changed my mind.

I get serious woofer bounce even at the start or end of a record when no music is playing and thus no vibrations could be affecting the table.

There seems to be a compatabilty issue with the RB300 and Grado which is why I'm looking for a suitable replacement.

However my knowledge of tonearms is limited and I don't know what to buy. Perhaps I should get a different cartridge but I really like the Grado sound.

Hi There

The table is a spring suspended Logic DM101 similar to a Linn. It rests on the cement floor on cement blocks with inverted cones underneath.

I've checked tracking force, cartridge alignment and table levelling many times.

When I say subsonics I mean woofer bounce to the point it's ridiculous I get it on every LP I play.

I'd also like to point out I've had the same problem with the Platinum and Sonata on this table/arm and other tables so I know it isn't my cartridge.

I know it isn't vibrations because the woofers go nuts even on silent passages even on relatively flat LPs with record clamp.

So I'm down to looking at the arm and it's compatibilty with the wooden Grados. Some people say the Rega/Grado combo is great and other get subsonics big time.

I love the Grado sound and don't want to change cartridges so I'm looking for a more compatible tonearm but don't know what.

Thanks Stefanl

Thats exactly what I was thinking a Haddcock or Morch with interchangable arms wands could be ideal.

What about a used SME such as the 3009.

anyone?

After doing some calculations the Grado cartridge resonance with the Rega arm is 8.4Hz.

When one takes into consideration the heavier after market counterweight I use the Frequency will drop even lower beacuse the arms effective mass will increase from 11 to lets say 13 or 14g.

What baffles me is that Grado suggested to me that effective mass arms between 12-16g are good with 14g being optimium.

One would think that a lighter arm would be a better match say around 9g and thus raising the frequency to between 11-12hz.

Bottom line Grado and Rega don't match on my table and I'll be trying another cartridge perhaps a Benz H2.

If anyone would like to comment further please do.

Not sure I understand what you mean