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Thread: F113 - The dreaded hum
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August 7, 2016, 08:55 AM #1
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F113 - The dreaded hum
Recommissioning my system today after completing the integration of an additional pre-amp.
Powered up and the right F113 is now humming.
Powered down the system and plugged the F113 into another circuit without XLR to be sure there was no sort of grounding issue or loop.
Toggled the F113 from grounded to isolation.
No change. The sub is otherwise working fine but has a persistent low level hum.
Evidently a fault (power supply module or amp). The other F113 (left channel) exhibits no issues.
I have read about others experiencing this fault.
Not happy. These subs weigh a tonne. Packing and shipping is a logistical nightmare. I have the original packaging in long term storage including the skid but cannot remember how to pack.
Time to call my dealer again.
Speakeasy
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August 7, 2016, 09:07 AM #2
Re: F113 - The dreaded hum
Steve - try it on the same outlet as what's feeding it (preamp?) to achieve a common ground. Also, is there no separate ground option on the sub? If not, you can perhaps try a make shift ground.
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August 7, 2016, 09:26 AM #3
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Re: F113 - The dreaded hum
Mike... They do normally run on the same circuit as the pre-amp and are currently connected on the same circuit.
Yes the the amp lets you float the ground by sliding the isolation switch on the rear. I have tried this and are running them set as GROUNDED.
The other F113 is not exhibiting any issues and is dead quiet. If it was a ground issue, the other F113 would be humming/buzzing also.
Have had the complete system unplugged with just the F113 power to mains with no line input.
1. Rear power switch toggle off. Sub is off no noise.
2. Rear power switch toggle on. Front power switch OFF. Sub is buzzing.
3. Rear power switch toggle on. Front power switch ON. Sub is buzzing louder.
4. Buzz is at the same level as 3 with line signal and front power switch set to AUTO. (Out of standby). This is how I always leave the F113s except when we are away for an extended period.
Speakeasy
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August 7, 2016, 09:36 AM #4
Re: F113 - The dreaded hum
Is it picking up interference from another piece? Try moving it away from the other gear. Try other cables, power and IC.
My Systems: http://www.audioshark.org/showthread...481#post158481
"We can hear everything we measure, but we can't measure everything we hear. Let your ears be your guide."
Dealer for: Aqua Hi-Fi, Aurender, AudioQuest Cables & Power Products, Berkeley Audio, Block Audio (distributor), Boulder Amplifiers, Bowers & Wilkins (B&W), Bryston, Clarisys Audio Loudspeakers (distributor), Classe’ Audio, Degritter Record Cleaning Machines, Esoteric, Finite Elemente, FirstWatt, Focal Loudspeakers and Headphones, GigaFoil, Harbeth Loudspeakers, Hegel, HiFi Man, Innuos, ISO Acoustics, Keces Power Supplies, Kharma Loudspeakers and Electronics, Kuzma Turntables, Lumin, Luxman, Magico Loudspeakers, MBL Speakers & Electronics, MSB Technologies, MySonicLabs Phono Cartridges, Nordost Cables, Ortofon, Pass Labs, Quadraspire, Rega Turntables and Electronics, Shunyata Research, STAX, Stein Music Products, Stillpoints, Soulution, VAC, Vicoustics, Viva Audio, VPI Industries, WireWorld Cables.
https://suncoastaudio.com/
Phone: 941-932-0282
Facebook: https://www.facebook.com/Suncoast-Au...1105178279194/
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August 7, 2016, 09:45 AM #5
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Re: F113 - The dreaded hum
Sub is not in any proximity of other equipment.
Ok, tried another AC power cord. No change.
Extension lead to another circuit. No change.
Increasing the volume level on the sub does not increase the volume of the buzz except slightly when volume is turned up to max. (No active line signal when doing this.)
Quite audible in quiet/softer passages.
Speakeasy
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August 7, 2016, 08:28 PM #6
Re: F113 - The dreaded hum
Probably the main filter caps in the subwoofer amp are bad.
Micro Seiki SX-8000 air bearing table, SME 312s arm, SME 3012R arn, Dynavector XV-1s cartridge, Lyra Etna SL cartridge, ARC Ref 3 phono stage, Otari MX-55 2 track R2R, Ampex 350 tape repros, Roon Nucleus Plus music server, HiFi Rose 150B DAC, ARC Ref 6, ARC Ref 75 with KT-150s, Parasound JC5 amp , JBL 4345 speakers, Viero Equilibro Level 3 speaker cables, and Definitive Technology Ref subs.
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August 8, 2016, 12:31 AM #7
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August 8, 2016, 04:26 AM #8
Re: F113 - The dreaded hum
Could always upgrade to Infrasonics!
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AudioShark forum is a leading forum site for High End Audio Discussion, Stereo System Discussion, Home Theater System Discussion, Best Home Stereo System Discussion, Home Theater Installation Discussion etc.
The AudioShark forum was created for sharing the passion of high-end Audio. We have Audiophiles from all over the world participating and sharing their knowledge. From novice to experts, you will find a friendly environment for discussing about High End Audio, Stereo System, Home Theater System, Home Stereo System, Home Theater Installation, Amplifiers, Speakers, Subwoofers, Integrated System, Acoustic treatments & Digital Room Corrections and many more.
At AudioShark, we also have incorporated an exciting Marketplace where members can peruse terrific buys on used gear, as well as meet dealers and discuss the purchase of new gear.
We are as crazy about this hobby as you are! So come on in and join us! Audioshark.org the Friendliest Audio Forum!
Industry Participation Disclosure : The owner and administrator of Audioshark is the owner of Suncoast Audio LLC in Sarasota Florida. Suncoast Audio has a full brick and mortar presence in Sarasota with several great show rooms with many world class brands. More information can be found at http://www.suncoastaudio.com
Audioshark is a community of like minded individuals. Audioshark welcomes participation from all manufacturers and owners of all brands and products. It is our belief that online forums provide a community of like minded audiophiles and music lovers to encourage the growth of this wonderful hobby.
Sincerely,
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