LP120 Loud bass hum when playing loud

always listening
Post Reply
joydivision
junior member
junior member
Posts: 6
Joined: 09 Dec 2015 23:00

LP120 Loud bass hum when playing loud

Post by joydivision » 27 Dec 2019 16:31

I have an LP120 I use for parties fitted with an Ortofon OM5 cartridge which works fine but after a while produces a really loud awful low frequency hum to the point it heats up the coil in the speakers. We also use a cheap Gemini deck which never has this issue nor does any of the Projects we have had to hook up as an emergency replacement.

The issue is the deck itself and not the setup, we have tried it with both the internal and external pre amp and it makes no difference. I am not sure what the next step is in trying to fix the issue. I thought about replacing the cartridge (I think I have a spare) but as the issue appears to be intermittent is is possible there is a short in the tone arm wiring which is hitting the metal arm?

Already checked the connections to the cartridge and they are fine.

Thanks for any ideas and tips to try and fix this issue once and for all.

XJ99
member
member
United States of America
Posts: 71
Joined: 30 Jul 2019 20:18
Location: Raleigh, NC

Re: LP120 Loud bass hum when playing loud

Post by XJ99 » 11 Jan 2020 00:16

So, no hum when playing at normal volume? Sounds
more like feedback. No?

lenjack
long player
long player
United States of America
Posts: 2751
Joined: 23 Jun 2017 02:11
Location: Liverpool, PA

Re: LP120 Loud bass hum when playing loud

Post by lenjack » 11 Jan 2020 04:04

Acoustic feedback, almost for sure. You need more isolation between the turntable and speakers, especially if they are on the same piece of furniture, but even if not. It's worse if you are boosting the bass.

hobie1dog
senior member
senior member
United States of America
Posts: 345
Joined: 01 Oct 2008 20:41
Location: Cornelius, NC

Re: LP120 Loud bass hum when playing loud

Post by hobie1dog » 12 Jan 2020 05:42

classic case of feedback, so you need more isolation as lenjack said above.

lreneat
senior member
senior member
Posts: 405
Joined: 19 Oct 2012 04:00

Re: LP120 Loud bass hum when playing loud

Post by lreneat » 22 Jan 2020 02:21

Try getting more distance between the turntable and the speakers. Lower the bass a little. Turn the volume down unless you want to have hearing loss as a gift when you reach mid-life.

Post Reply