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Is the hum in the receiver-attached speakers or the sub?
How is the sub attached - RCA or speaker-level?
Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
If it hums with the sub attached, unplug the sub's power cord. Differences in AC ground potentials will generate hum across linked devices.
I have the same setup. Use 1 pair (Left/Right) RCA to RCA cable. Connect from Velodyne "Input" (left connectors) to Yamaha SubWoofer #1 Preamp output. Make sure you have the sub's volume (left knob from back) very low (full counter clockwise is "Min") until you are setting up the audio balance in your house/room. Set Low Pass cross over to 80Hz, Phase switch to 0, subsonic to 20Hz, X-over to "IN", Power to "auto"
On Yamaha RXV1 remote control, go into speaker setup and turn on Sub and any other speakers you have connected.
Warning!! do not turn up volume near a china cabinet while you are watching a movie. Everything will walk off the shelf.
Hi, Yes you should make adjustments.KEF makes very good products, however if you don't handle this you will have to replace or service it. 1 If the woofer is very close to you, relocate it further away. The reason being is that the lower the frequency the larger the wave form. The lowest waveforms will become louder. 2 Adjust the high frequency cut off to be at 80Hz. This should eliminate boom. Higher Sub frequency tend to muddy the sound. 3 The sub should have a subtle effect in music. So the relationship between it and the speakers it augments the sound of should be seamless. 4 If you are playing Rap or Reggie music and you like to play it loud. Add another sub into the system and locate it NEXT TO the KEF Sub. In this fashion the two subs will reinforce each other's energy. They will "couple" thus multiplying their energy considerably. Hope this helps, Best Regards, Mark
Boy, it's hard to just give up on such a great classic sub. Have you tried kicking it and yelling profanities?
I find it hard to believe that the sub would die after sitting unused. But, short of replacing the transformer, I'd try everything from plugging into different outlets, making sure the outlet isn't plugged into a light switch, etc. It's a good sub and you'd be hard pressed to find a new comparable sub for less than $400. But, If you need an excuse to go out and buy a Velodyne, this may be it!
Offhand should work more than OK. Even if the 520 is only pushing 75watts per channel, you have 2 X for the front KSB-2.1 (left & right) plus another 75 for the Polk Audio center in addition to 250watts built-in amp of the Velodyne CT-150. What would be better is another pair of KSB-2.1 or comparable for the surround (another 2 X 75 and widening the separation).
Good luck and Thank you for using FixYa. Happy Holidays.
I don't know the design of this reciever, and do not have any schematics or engineering information to know the design.
This is a general comment:
In many of these recievers at this level they don't have very good muting designed in to their system. When switching sources, the audio is not being muted.
This is a theory of why the noise is not on the main speakers, but present on the sub woofer. Because the switching noise is of very low frequency, this is why the sub woofer is making noise. The main speakers lack the low frequency sensitivity that the sub woofer has. This is one way of looking at it. It is also possible that there is muting for the main speakers, and none for the sub woofer.
If the reciever does have muting in to its design that is supposed to mute when switching modes, then there is an obvious defect. When a source is switched, or a mode is changed, the output would mute for the duration of the switching interval. This is usually for a period of about 100 ms.
Your best bet is to contact the service rep for nakamichi and ask the question there.
I have serviced many recievers made by other manufactures. The higher end models all had muting in their design. This way, the output was muted when the source was changed, and when the reciever was turned off or on.
The problem was that some subwoofers (inluding my velodyne model) cannot process the LFE signals through the line level inputs on its amps, so the other way to run your subwoofer is to run the front left and right speaker outputs from your receiver to the speaker-level inputs on your sub, and then plug your front and left speakers into the soeaker level outputs on the sub. you have to set the onkyo receiver to "Subwoofer: No". that way the LFE signals are sent through the front speaker channels and you will get the same BASS output as if using the line-level input. O So yes it does require a bit more speaker cable, but it works fine now.