03-17-2007 06:07 PM - edited 06-13-2007 12:18 AM
The Hum noise is normal
Truth: All capacitors have a potential limit of how much low frequency can be filtered.
Fact: All Transformers hum to some degree.
The annoying hum noise is caused by an internal voltage transformer block that is attached to the large heat sink on the back of the subwoofer to step-down voltage. Like any normal transformer, it omits heat and a hum noise. For example: Walk outside to a nearby high voltage step-down transformer of 250v to 125v and you’ll most likely hear a loud buzz from outside the case. Secondly, a desk light such as those from Ikea consists of a transformer to step-down 125volts to 12volts also omit a hum noise. However, if the hum from the subwoofer sounds like a twelve volt cooling fan spinning at 3500 rpm, sending the product for RMA may be a wise idea.
Message Edited by Insomnialife on 06-13-2007 12:18 AM
03-17-2007 06:58 PM - edited 06-13-2007 12:17 AM
See Ash's Case below for more information about an abnormal hum sound from the Amplifier
Message Edited by Insomnialife on 06-13-2007 12:17 AM
05-25-2007 07:33 AM
I also have a strong HUM coming from my satellite speakers.........when I say strong I can hear it from about 5 meters away even the sub and speakers are isolated to the middle of a room with no input feeding in.
Surely this can't be right?
I can understand a hum coming from the transformer (in the sub) but there is no reason (other than appauling quality) that would account for it coming out of the two main speakers?
Any input would be appreciated.
05-25-2007 03:23 PM
05-27-2007 08:58 PM
05-28-2007 10:30 AM
Ohhhh that article clarifies my speakers: The subwoofer whisper hums while the satellites produce background noise (hiss) = Still normal.
Thank-you for the article Mona
05-28-2007 10:39 AM
If your experiment is based on: the subwoofer knob set at max, your volume knob set at max with no input source, you are hearing the loud hum because amplifiers are made to amplify sound (which my speakers also does - amplify the hum). When a source is connected, the sound from the source should drown the hum.
06-11-2007 10:05 PM
Hi Insomnilife and Mona,
Thanks for your input ...... Well I can happily report that my speakers have been replaced and as a result the humming has gone!
No hum from the satellites, and no hum (identifiable at 1metre at least) from the Sub!
Anyone who has an issue with humming should return there speakers for replacement (after performing an isolation test and reading over the knowledge base above).
It seems that my new set of z-2300's is a different production run (slight changes on the sub, different packaging etc) so perhaps past issues have been resolved.