Question about Velodyne CHT-12 Subwoofer

2 Answers

Sub-woofer does not turn itself on in 'Auto' mode (signal driven)

I constantly have to switch it off then on again, and when I turn it on again the next day, it will often not turn itself on although it is still in 'auto' mode. Also, The sub-woofer will start humming at a very low frequency at any time sporatically after I have shut down my home theater system. I manually have to shut down the Sub to stop the humming. Thanks, Claude Hamel claude.hamel@pwgsc.gc.ca or landbaron13@295.ca Qu?bec, Canada 1-819-457-4985 Model CHT-12

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For the "auto on" problem.

These will sound very basic, please go with it.

On your signal source, make sure you have the sub set to on.
If you can adjust the output setting on your source, turn this up.
Adjust the volume setting on the sub lower to mach the volume of the main speakers.
You may need to make these adjustments a few times to get them working.

On the hum and noise problem

Check your power outlet for the sub, make sure the polarity is correct. I have found this to not always be right. Also what is on that same circuit. Things like the fridge can cause a lot of noise on the power line. Next check your connecting cables, are they of good quality? Are they running next to anything that may cause interference? Also check you connections to the signal source. Cable and dishes are known for ground problems.

Posted on Jan 04, 2009

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  • 9 Answers

Expert Technician is required: -you have a problem at the signal detector section that needs to be Fixed. Good Luck Toufic Malek

Posted on Sep 28, 2007

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H?,
You have a very good system...one of the best of SONY..SUB does not get activated automatically especially on STEREO mode.DIRECT STEREO Notes • No sound will be output from the subwoofer.
.your system has Dedicated Power Amplifier for 2 Externally Driven Sub-Woofers (200W RMS x 2)..in order to activate the sub woofer amplifier you need to make a selection on the surround modes while you are switching the modes of the surround you will see the speaker position on the display of receiver as well..if you do not see the sub woofer it wont be activated..Sound Field Program (A.F.D) is a good example to test it..
Take care and please Remember to rate/vote and give me 4 Thumbs Up
for Helping out the Community :)

Hope this helps!

--------------------
Additionally please follow the instruction on your user manual to activate the SUB ,as is follows..

-----------------
BASS-OUT
Low-frequency (bass) signals can be directed to the
subwoofer and/or the front left and right speakers
according to the characteristics of your system. This
setting also determines the routing of the LFE (low-
frequency effect) signals found in Dolby Digital or DTS
sources.
Choices: SWFR (subwoofer), FRONT, BOTH
• Select SWFR if you connect a subwoofer. LFE and
low-frequency signals from other channels are directed
to the subwoofer according to the speaker settings.
• Select FRONT if you do not use a subwoofer. LFE and
low-frequency signals from other channels are directed
to the front speakers according to the speaker settings
(even if you have previously set the front speakers to
SML).
• Select BOTH if you connect a subwoofer and you want
to output low-frequency signals from front channels to
both the front speakers and subwoofer. LFE and low-
frequency signals from other channels are also directed
to the subwoofer according to the speaker settings. Use
this function to reinforce low-frequency signals using
the subwoofer when playing back sources such as CDs.

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I have a sony HTDDW7600, i cannot get the dedicated subwoofer amp to work. The fan is running on it, but for some reason the only way i can get it to do anything is to unplug the cable that goes from the...


H?,
You have a very good system...one of the best of SONY..SUB does not get activated automatically especially on STEREO mode.DIRECT STEREO Notes • No sound will be output from the subwoofer.
.your system has Dedicated Power Amplifier for 2 Externally Driven Sub-Woofers (200W RMS x 2)..in order to activate the sub woofer amplifier you need to make a selection on the surround modes while you are switching the modes of the surround you will see the speaker position on the display of receiver as well..if you do not see the sub woofer it wont be activated..Sound Field Program (A.F.D) is a good example to test it..
Take care and please Remember to rate/vote and give me 4 Thumbs Up
for Helping out the Community :)

Hope this helps!

--------------------
Additionally please follow the instruction on your user manual to activate the SUB ,as is follows..

-----------------
BASS-OUT
Low-frequency (bass) signals can be directed to the
subwoofer and/or the front left and right speakers
according to the characteristics of your system. This
setting also determines the routing of the LFE (low-
frequency effect) signals found in Dolby Digital or DTS
sources.
Choices: SWFR (subwoofer), FRONT, BOTH
• Select SWFR if you connect a subwoofer. LFE and
low-frequency signals from other channels are directed
to the subwoofer according to the speaker settings.
• Select FRONT if you do not use a subwoofer. LFE and
low-frequency signals from other channels are directed
to the front speakers according to the speaker settings
(even if you have previously set the front speakers to
SML).
• Select BOTH if you connect a subwoofer and you want
to output low-frequency signals from front channels to
both the front speakers and subwoofer. LFE and low-
frequency signals from other channels are also directed
to the subwoofer according to the speaker settings. Use
this function to reinforce low-frequency signals using
the subwoofer when playing back sources such as CDs.

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Sub-woofer Malfunction


sub can be detecting signal from your amp. maybe your amp has some small output when in standby mode. some amps throughput signal from satellite boxes when they are supposed to be off.
try shutting off that signal source as well.
good luck
mark

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