nedf
11-23-07, 11:45 AM
Has anyone tried to use the Jensen SUB-1RR or CI-1RR Audio Isolators instead of a Jensen VRD-1FF CATV Isolator to fix subwoofer hum caused by a ground loop? If so, did it work and which one would be best for my Aperion S-8 sub?
I tried the VRD-1FF CATV Isolator, which took care of the ground loop hum; however, it also screwed up my CATV (lost 3-4 channels, heavy pixelation on a few HD channels, problems with OnDemand).
Instead of blindly upgrading to a 705 or 805, or spending more time chasing down reflections of the video signal in my coax and possibly having to deal with Comcast, I'm thinking of swapping out the VRD-1FF for the SUB-1RR or CI-1RR. I like the idea of leaving the CATV feed alone and taking care of the ground loop problem on the RCA line between the receiver and the sub.
SUB-1RR ($115): *jensen-transformers.com/sub1rr.html
CI-1RR ($115): *jensen-transformers.com/ci1rr.html
VRD-1FF ($60): *jensen-transformers.com/iso_vid.html
*Add "www." here. I'm new to the forum and not yet allowed to post URLs.
Receiver: Onkyo TX-SR605
Speakers: Aperion Intimus 422 Harmony 5.1 system (422-LR front, surrounds; 422-C center, S-8 powered subwoofer)
CATV Box: Motorola DCT3416 I
TV: Sony KDL-46W3000
DVD/CD: Older Panasonic DMR-EH50 DVR/DVD/CD
Coax to Motorola. HDMI from Motorola to 605. Component from Panasonic to 605. HDMI from 605 to TV. 15' Dynex (inexpensive from Best Buy) RCA with Y adapter from 605 to Left and Right inputs on S-8 subwoofer (recommended by Aperion). I am also considering replacing the 15' Dynex with a 6' subwoofer cable from Monoprice (can't find a 6' cable locally).
I have the front, center, and surround speakers set to 100Hz on the 605. I also have the cutoff frequency on the 605's LFE channel's low-pass filter set to 100Hz. I have the crossover on the S-8 set to 100Hz (phase set to 0, level set to 5/10). The sub's power is grounded. All of the above equipment is on the same surge protector.
The hum isn't there when the sub is turned on. It starts as soon as the 605's LFE channel kicks in, regardless of input (CD, Tuner, DVD, or CATV). The behavior is the same with the CATV Box on or off. The hum stops as soon as I unplug the coax from the CATV Box.
Thanks in advance for helping me find the quickest path to no more hum.
I tried the VRD-1FF CATV Isolator, which took care of the ground loop hum; however, it also screwed up my CATV (lost 3-4 channels, heavy pixelation on a few HD channels, problems with OnDemand).
Instead of blindly upgrading to a 705 or 805, or spending more time chasing down reflections of the video signal in my coax and possibly having to deal with Comcast, I'm thinking of swapping out the VRD-1FF for the SUB-1RR or CI-1RR. I like the idea of leaving the CATV feed alone and taking care of the ground loop problem on the RCA line between the receiver and the sub.
SUB-1RR ($115): *jensen-transformers.com/sub1rr.html
CI-1RR ($115): *jensen-transformers.com/ci1rr.html
VRD-1FF ($60): *jensen-transformers.com/iso_vid.html
*Add "www." here. I'm new to the forum and not yet allowed to post URLs.
Receiver: Onkyo TX-SR605
Speakers: Aperion Intimus 422 Harmony 5.1 system (422-LR front, surrounds; 422-C center, S-8 powered subwoofer)
CATV Box: Motorola DCT3416 I
TV: Sony KDL-46W3000
DVD/CD: Older Panasonic DMR-EH50 DVR/DVD/CD
Coax to Motorola. HDMI from Motorola to 605. Component from Panasonic to 605. HDMI from 605 to TV. 15' Dynex (inexpensive from Best Buy) RCA with Y adapter from 605 to Left and Right inputs on S-8 subwoofer (recommended by Aperion). I am also considering replacing the 15' Dynex with a 6' subwoofer cable from Monoprice (can't find a 6' cable locally).
I have the front, center, and surround speakers set to 100Hz on the 605. I also have the cutoff frequency on the 605's LFE channel's low-pass filter set to 100Hz. I have the crossover on the S-8 set to 100Hz (phase set to 0, level set to 5/10). The sub's power is grounded. All of the above equipment is on the same surge protector.
The hum isn't there when the sub is turned on. It starts as soon as the 605's LFE channel kicks in, regardless of input (CD, Tuner, DVD, or CATV). The behavior is the same with the CATV Box on or off. The hum stops as soon as I unplug the coax from the CATV Box.
Thanks in advance for helping me find the quickest path to no more hum.