Question about KLH BB-II Subwoofer

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No base sub turns on, but there is a humming sound and no base. i changed cables and nothing changed. i hooked up the speaker level inputs and it works. the only problem is that hooked up like that i get audio with the base. not enjoyable. can someone help

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Problems like this are usually the result of one of two conditions, the lack of a properly grounded phono cable connection at either the amplifier or the sub. To help isolate this problem, try plugging the end that goes to the amp into a jack such as the Tape Out. If the hum goes away then there is a problem with the sub out. If the humming doesn't change then it is either the cable or the Sub itself.
The other condition is what is known as a difference in ground potential between the amp and the sub. If both components have grounded (3-pin) plugs you may have to isolate the ground of the sub by using a 2 to 3 prong adapter and ground the sub to your receiver.

Posted on Oct 15, 2008

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1 Answer

Speakercraft v10 subwoofer not taking input signals


Does any other speakers work through the channels you are putting the subwoofer through? Reason i ask is could there be a fault with the channel you are using i.e AUX? is your subwoofer connected with Aux cables or is it a speaker cable? If aux cable is there a slight break in the cable?

Jan 04, 2014 | Audio Players & Recorders

1 Answer

Hook up lower level input to the audio source 230 subwoofer but can't get any sound for the speaker that is hook up through the speaker level input or output.


The speaker level connectors on the sub are for use when you DON'T have an AV receiver-style subwoofer output. They only pass-through from YOUR amp to other speakers. You should NOT use both Line level and Speaker Level input to the sub.

What is your electronics? Have you looked at the manuals?

May 02, 2011 | AudioSource System 230 / 235 System

1 Answer

How do u hook up the infinity entra sub it has speaker level(input and output) that look like these red and black spots r for spearker wires and then line level input so I connect my music to the rca plugs...


Maybe if you described the setup with exact model numbers for everything involved we might be able to answer with specifics.

You could poke around her for the Entra Manual for YOUR model.

http://manuals.harman.com/INF/Hom/Owner's%20Manual/

What they do NOT explicitly tell you is that the amp in the sub is not for your other speakers running off it's Speaker Level outputs. They're just there as a pass-through if you use Speaker Level from your own amp.

Line Level (RCA) IN to the sub will NOT pass anything out those Speaker level outputs.

Jan 13, 2011 | Infinity Entra Sub Subwoofer

1 Answer

Making loud humming noise only.but if you plug


If I understand this correctly: with NO input or cable attached it hums; with an RCA cable attached it works. (What does 'some' mean in this regard?)

You say that connecting the RCA cable improves its sound. That tells me you're supplying a ground through the RCA cable for stray voltage in the sub.

It seems there may be a basic power issue if it hums with no input. Sometimes a given power source in a home may be wired differently than others or may insufficient grounding, which can result in hum. Try reversing the sub's power plug or move it somewhere else.

Since the sub contains its own electronics it is also susceptible to strong external magnetic fields. Keep it and any signal cables leading to it some distance away from other electrical devices like TV's.

Apr 08, 2010 | Velodyne CT-100 Speaker

1 Answer

Subwoofer turns on and is hooked up, but no sound.


The signal don't seems to be present to the sub input.
Try change the wire betwen the audio system and the subwoofer.
Spider Guy

Mar 15, 2010 | Onkyo 630-Watt 7.1 Channel Home Theater...

1 Answer

Which is the best way to hook up a Subwoofer?


Last two questions first - YES, use an RCA splitter to share sub line level out between two subs and use one at the subwoofer end to share that line with both inputs on the sub.

Either attachment scheme you describe would work.

Not being a big fan of conversion/deconversion for no real purpose, I would avoid stepping the high-level input down to line level for use by the sub's internal amp, run RCA to the sub(s) and keep them physically and electrically independent of anything else unless cable routing is facilitated somehow by daisy-chaining other speakers from the sub(s).

Jan 17, 2010 | KLH PSW8100-8 Subwoofer

1 Answer

I have had my subwoofer for 6 years. It has always


One way to check the operation is to connect a source directly to the inputs of the sub.

A CD player will work fine. Connect the out puts of the CD player to the inputs on the sub. Play a CD.

If you get music from the sub, then no problems with sub.

If nothing, sub has problem.

Could be

A Dead amp.

A Dead speaker.

Velodyne products usually need to be returned to them for service.

Cost is unknown.

Sep 02, 2009 | Velodyne DLS-3500 Subwoofer

2 Answers

Bought a used Martin Logan Dynamo subwoofer a couple days ago and have a very loud hum when the ac cord is plugged in, even if the speaker is not connected to an audio source. The "hum" can be heard in any...


Neither the amp or the sub have grounded power cords.

I have discovered the ML Dynamo takes about 30 minutes to switch to standby in auto mode.

With speaker level inputs connected to the Onkyo A807 amp, both units powered from the same wall outlet, Dynamo sub on Auto, the sub hums for about half an hour after the Onkyo is switched off, then the sub goes quiet. Not so good.

I connected a bonding wire between the two units on 3_7_09. If I smoked some old audio gear I could just look at that as an opportunity, right?

Works fine. Now I have the ML powered from the wall and working normally.

Jun 30, 2009 | Dynamo MartinLogan Subwoofer Speaker

2 Answers

Subwoofer probelm


I suspect you have a bad cable, a poor ground or a bad
power supply inside the speaker amplifier. The amplifier
(inside the sub-woofer) could also be defective.
===
1) Bad cable or connector:
If the (braided shield/outer tube) of the coaxial input cable is
not grounded, the cable will pickup line frequency "hum"
from surrounding power lines, house wires, lights and
appliances.

This hum is then amplified by the speaker's amplifier
causing the constant bass sound you speak of.

Because the hum frequency fundamental is 60 Hertz in
North America, 50 Hertz in Europe, you hear it coming
mostly out of the sub-woofer, because the midrange and
high speaker circuits filter it out.

Check the input connectors, cable at both ends, wiggle
the jacks at a low volume setting to see if it changes.

Make sure that you are indeed using a properly shielded
coaxial cable.

A coaxial cable consists of a thin inner conductor, surrounded
by a flexible tube made up of a braided metal shield, which
must be grounded. This prevents hum from being picked up
by the sensitive amplifier inputs.
===

2) If the power supply within the sub-woofer's internal amplifier
is defective, the the power supply hum will also get coupled
into the amplifier and speaker with same results as above.

Power supply hum is typically twice the line frequency,
i.e. 120 Hertz, but not always, depending on what
component failed: Rectifier diode, filter capacitor, or
the voltage regulator.

3) Ground loops:
When you run very long cables between the source and
destination of an audio signal, multiple ground paths (must)
exist between the two points in space, creating complete
loop circuits.

Power line hum from the environment can (will) induce
heavy AC currents around these loops, creating a voltage
gradient across these cables, and in-between the end
devices.

Once again, this AC hum is coupled into the amplifier inputs.

Ground loops become a problem with cables over 10
feet long, and an astronomical problem for stage audio
engineers. To avoid ground loops, they must break
the circuit's continuity by using isolation transformers,
optical isolators, and/or differential input amplifiers.

So how long are your cables?

Most house stereo components are only designed to
handle 6 to 10 feet of cabling max.

30 feet is already asking for major trouble.

4) Feed back oscillation: This occurs when the output of
an amplifier is fed back to the inputs with a round trip
gain greater or equal to unity. The tiniest little electrical
disturbance is then amplified and re-amplified, over and
over again, usually at one preferred frequency, causing
the typical (ear-splitting) microphone squeal or howl.

In your situation feedback and/ loss of original signal
could be the result of mis-wiring the input cables.

Note that this is NOT as silly nor as unlikely as it sounds,
because many computer audio cards and even some
home stereo systems have re-configurable inputs and
outputs.

SOFTWARE configuration decides which jack at the
back does what !!!!

On my computer, for example, the Realtek audio driver
tries to automatically figure out what cable is connected
to each jack (usually it gets it wrong)

Using the Realtek control panel applet, I can then
manually re-configure the gray jack as input,
the green jack as bass, pink jack as center.... etc.

If this situation also applies to your system, please check
the software configuration. Connecting an output cable to
an input jack will certainly cause a lot of HUM and not
much music.

5) Finally, don't rule out internal sub-woofer failure. Unlike
the passive stereo/hi-fi speakers of days gone by, modern
multi-channel theater systems with front, center, rear and
sub-woofer speakers are internally amplified, with active
frequency cross-over filters and special effect/ surround
sound capabilities.

Usually, the large sub-woofer contains most of the
electronics, amplifiers and filters.

It feeds the other speakers, and it is controlled by
an external volume control module which can be separate
or built into one of the tweeters.

These sub-woofer electronics are prone to poor design,
overheating and early failure. (Even fresh out of the box
like yours)

If you cannot get it working, take it back to the store,
and make the NICE salesmen **** with it.

Good luck
Please rate my answers
Martin.

Jul 20, 2008 | Yamaha 5.1-Ch. Surround Sound Home Theater...

1 Answer

Loud hum on subwoofer.


try another speaker on that channel if you get no sound or it hums then it is time to take your set to a tech your audio out put on that side is damage along with some caps.good luck.

Mar 30, 2007 | Polk Audio RT1000I Speaker

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