Gordon
Well-known member
On a whim this weekend, I purchased my first TT in 30 years. It is a Pro Ject 1-Xpression III with an Ortofon 2m Red cart. I gave $400 for the kit. IF this small experiment pans out, a higher level table is in the cards. I did not want to invest more funds until I figured out some of the ins and outs of spinning vinyl.
The first major issue I'm experiencing is woofer pumping. At low volume level, up to about 40 on my pre, the sound is fine. Once I exceed 40, both subs are going into convulsions! There is a physical and audible fast pumping which forces me lower the volume. If I turn the subs off, the pumping disappears and I am not volume limited.
The table is on my rack, top shelf centered between the speakers/subs. There is about 4.5ft from table to each sub. The front plane of the subs is about 6 inches in front of the table. I'm using some AudioQuest Viper ICs I had on hand and the TT is grounded to the pre. The ground has no impact on the pumping as I've tried both configurations.
Searching the web has given me a few ideas.
1. Isolate the table. Wall mount and or sand box
2. Use of a rumble filter. KAB RF-1 is the most noted
3. Move table.
I understand the first two. But what I could not nail down is how long of an IC can be used between TT and pre?
If any of you guys can give me some other suggestions, I'm all ears!
The first major issue I'm experiencing is woofer pumping. At low volume level, up to about 40 on my pre, the sound is fine. Once I exceed 40, both subs are going into convulsions! There is a physical and audible fast pumping which forces me lower the volume. If I turn the subs off, the pumping disappears and I am not volume limited.
The table is on my rack, top shelf centered between the speakers/subs. There is about 4.5ft from table to each sub. The front plane of the subs is about 6 inches in front of the table. I'm using some AudioQuest Viper ICs I had on hand and the TT is grounded to the pre. The ground has no impact on the pumping as I've tried both configurations.
Searching the web has given me a few ideas.
1. Isolate the table. Wall mount and or sand box
2. Use of a rumble filter. KAB RF-1 is the most noted
3. Move table.
I understand the first two. But what I could not nail down is how long of an IC can be used between TT and pre?
If any of you guys can give me some other suggestions, I'm all ears!