2. analog
  3. 155177-143131

Why the woofer moves badly when playing certain LPs

Hello. First greeting.
My turntable is Pro-Ject The classic, Phono is Lejonklou Gaio2.4 and Cartridge is AT150sa.

However, I am having problems with my woofer moving badly when playing certain LPs.
Generally, this is not the case with the older, dusty LPs of the 80's, but rather with the record just new released LPs.

I want to get help from someone who knows why this is happening.
Sorry for my broken English.
Thank you very much.

starbusters

Showing 2 responses by imhififan

imhififan's avatar
imhififan
2,127 posts
 
Audio Technica AT150Sa
Weight 8.0g,
Static Compliance 40 x 10-6 cm/dyne,
Dynamic Compliance 10 x 10-6 cm/dyne (100Hz)

Pro-Ject the classic turntable
Effective Arm Mass: 13.5 g

Resonant frequency of arm/cartridge: 7.5Hz

Look like arm/cartridge mismatch is the problem !
imhififan's avatar
imhififan
2,127 posts
 
If AT’s compliance is 10cu @ 100Hz you have to convert it first to 10Hz and it will be about 17cu @ 10Hz (Mid Compliance).
I just estimate and simply doubled it to 20 @ 10Hz for calculation.

Resonance frequency within 7-12Hz is optimal for the system.
I'd like to have 8-12Hz as optimal value.
More to discover