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View Poll Results: Humming points
From 9 to 11 o'clock 2 66.67%
From 11 to 2 o'clock 0 0%
From 2 o'clock and above 0 0%
Not really 1 33.33%
Voters: 3. You may not vote on this poll

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Old April 4th, 2015, 6:57 AM
ironbadge ironbadge is offline
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At what point your sub or mid-bass unit hums?

I purchased a VTF-2 MK4 and a MBM-12 MK2 few months ago. I did not notice they hum at that point. Recently I found the VTF-2 MK4 hums, with or without the RCA cable attached, from 9 o'clock volume level. The humming increases with the volume increasing. The MBM-12 MK2 exhibits the same humming at 11 o'clock volume level.

With the cable attached, the noise is a typical electronic hum; without the cable attached, the noise is more like a rumbling. I detached the cables completely, or detached them at the receiver end, they still hum. I unplugged the power plug and plugged it to the other outlet across the basement, the mid-bass still hums (I did not try this with the sub). To my knowledge, the previous homeowner did not have cable TV but they had Verizon FIOS like I do now. I do not use TV services. I use antennae. No other electronic or electric or any other equipment was operating at the times I observed the humming.

I talked to HSU tech support and I was told that is normal. The gentleman also told turning the units past the 12 o'clock level is too loud. He told me the volume knobs should be at 10-11 o'clock levels max. I have very limited knowledge about electronics but I took some electronics courses before. I was told if it hums, it's not good.

Here are my questions:
1. Is this normal? If not, how bad is it?
2. At what levels do your units start humming?
3. Can a power conditioner device help?
4. Any other solution can help?

I appreciate all your inputs all your helps!
Music: PS-LX300USB, DVD-S1800BL, RX-A1030, Sony Blu-ray, Pioneer LD, PS3, NHT Absolute Towers, NHT Absolute Zeroes, Pinnacle center & surrounds, VTF-2 MK4, MBM-12 MK2, Samsung 36xx
HT: Sony BDPS5200, AVR-790, Infinity Primus 363s, Energy Take center & surrounds, Klipsch SW-350, Pinnacle Subcompact8, LG BL5900

Last edited by ironbadge : April 4th, 2015 at 7:10 AM.
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