AudiogoN Forums: Hum from both speakers...This is New Please read.

Hum from both speakers...This is New Please read.

Hi All, I would like to say I am new to channel after a long recovery from mid-fi! I am building a system in my home office. It consists of; Jolida 302crc (new tubes tried ), Jolida glass FX Dac, Jolida jd9, Rotel 2500 turntable..., pioneer elite pd65. Monitor Audio Silver RX2, Epos M Sub.
AQ rocket 88 speaker cable, AQ IC's.

So, the Jolida 302 is new. Since the first setup there has been a hum from both speakers. For the last month, I have been going insane throwing time and money at the problem. I have read, I think, every post on audiogon bout hum and the related links connected to other sites.

So, this AM, I am chasing the problem again, and I noticed that when I disconnect the negative speaker connection on the right speaker it goes away. Dead silent. Plug it back in and It returns. If I do this on the left speaker, it does not go away. Thes are biwired speakers and the hum only goes away on the right speaker, negative, low Freq posts. If I switch speaker sides, hum is still there but removing the right negative does nothing.

So,

Is it the negative speaker post on the amp?
Is it the negative speaker post on the speaker?
Is it the cable?

Could the ground in the amp or the speaker be loose on the right neg. post?

I know this subject has been beaten to death, but I think I am going to need counseling if I don't solve this.

Thanks in advance,

Troy

Plosive (System | Threads | Answers | This Thread)

03-24-12

Responses (1-18 of 18)

Click title to read one, or click date to read all below it.

03-24-12 You don't say what type of interconnects you have. i had a p ... Uru975

03-24-12 Bananas at both ends. sub bare wire at amp to spades on sub ... Plosive

03-24-12 Is it the negative speaker post on the amp? is it the negati ... Blk25

03-24-12 Blk25, thanks! i have gone through the above steps and i'm l ... Plosive

03-24-12 When you solve this one let me know. i have an identical pro ... Newbee

03-24-12 Yeah, if you find an answer please post it. i've had the sam ... Grimace

03-25-12 Sometimes it's a ground loop involving the subwoofer. have y ... Hifigeek1

03-25-12 Ground "floating" often fixes this sort of thing.. ... Wolf_garcia

03-26-12 That does sound like it could be a ground loop problem, but ... Atmasphere

03-26-12 First off, thanks for all the responses! i tested so many di ... Plosive

03-28-12 I'm not sure you have tried things in the right sequence. ... Minorl

03-29-12: Plosive
Minori,

Thanks for the detailed plan. I like the very structured approach and as soon as the AMP returns, I am going to try your methods.

As far as the outlets, my problem is the distance from the source. Should I purchase long PC's (~12 feet to the next outlets)? What is better, Longer power cords or IC's?

I have some freedom in the room as far as placement and I have been considering a rack on the side wall and running longer speaker cables and/or a mix of components on the front wall. This would be helpful as space is an issue up front.

The System is in my home office. If you look at my system, you can see that everything is sitting on a credenza. I am not happy with this placement.

Some components can go in the cabinet, but I would like to have the Jolida, Pioneer and the VPI Scout (Being delivered Saturday 3/30/12) visible for looks and ease of use. I also have the Jolida Phono Stage, Jolida DAC and a Pioneer Elite CD player. Behind the cabinet are all the cables and a monster HT2500 power center. Any Ideas on optimum placement would be much appreciated.

Thank you for your time already. Any help on the above from you are anyone else that would like to support a newbie, would be great!
Plosive (System | Threads | Answers | This Thread)

03-30-12 Wire world 7m cable works awesome! Plosive

03-30-12 I recently fixed a hum issue that was coming through my spea ... Blueskiespbd

04-20-12 Ok, i received the jolida 302crc back today in the form of a ... Plosive

04-26-12 How much did the upgrade set you back? or are you still cove ... Texlle

04-27-12 How much did the upgrade set you back? or are you still cove ... Texlle

04-27-12 The upgrades to the resistors and the settings for easy bias ... Plosive