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Sub rumbles at very low freq that I cannot raise my output level on the sub

I have a krk submonitor that I use with my av reciever and when I try to raise the level on the sub I get a rumble with the bass sound so that I cannot raise beyound a certain level

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Hello,
That rumble could be several things, start by switching your patch cables to see if there is a fault in the sine. If not it could be the amplifier trying to pull a constant source of current through it to operate and is being corrupted by a fault in the circuitry, or a feed back look of some sort. Either way, if you can't find a problem with your input signal, your sub will need repair or replacement. I hope this helps...

Posted on Oct 17, 2008

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1 Answer

Can I use a JX-S900 Y/C separated I/O to run two subwoofers out of same reciever??


Yes, on two conditions:

1) the JX-S900 needs to be a proper matrix switcher. It has to have the ability to route 1 input to more than one output.

2) the sub signals need to be low level RCA/phono, and not high level speaker wire connections. That's not just about the type of connector. It's about the signal going through those wires. A low level RCA/phono sub connection conducts a maximum 0.7 Volt. A speaker wire connection can transmit 30 Volts! If you put 30 Volts in to a line level switching device such as the JX0S900 you'll fry it.

Provided that the above two criteriia are both met, then yes it will work.

  • Connect the AV receiver's sub out to Source 1 - white RCA phono.

  • Connect the two subs mono LFE Left input (white RCA) or the single black RCA/phono inputs to the JVC's outputs 1 and 2 - white RCA/phono.

  • Set the source routing: input 1 goes to output 1 and 2

Sep 17, 2014 | Audio Players & Recorders

1 Answer

Kicker dx 250.1 class d monoblock amp has a fixed lpf at 80 hz 24db octave non adjustable. My car stereo is a pioneer deh-x55hd with the sub control set at 100 hz -6 slope unable to turn sub control off to...


Do you have the subwoofer amp connected to the pioneer thru pre amp connections; pre amp output of pioneer to pre amp input of Kicker amp. Page 10 of the manual explains how to adjust the subwoofer output. You can select the cutoff freq. that will pass to the subwoofer; The slopes don't match perfectly, but if you use the -12 slope , it should work fine.
Cut-off frequency:
50HZ
-
63HZ
-
80HZ same as kicker cut in freq
-
100HZ
-
125HZ
-
160HZ
-
200HZ
Output level:
-
24
to
+6
Slope level:
-
6
-
-
12


http://www.pioneerelectronics.com/StaticFiles/Manuals/Car/DEH-X5500HD_OwnersManual112712.pdf

May 19, 2014 | Car Audio & Video

1 Answer

Friend with AVR 335 is experiencing very low subwoofer output to powered sub - has to be turned up to max for any sound at all and really just produces low rumble - no real impact - have tried sub with my...


Why aren't you looking at the sub for the reason? It may have the crossover set too high.

If the sub is loud enough during level setting, look at receiver settings, otherwise it's the sub amp.

Feb 10, 2011 | Harman Kardon AVR 335 Receiver

1 Answer

I'm not sure how to hook up a powered sub woofer to my rx4109 reciever


It doesn't have a specific low-frequency or subwoofer output.

Depending on your unnamed subwoofer we may be able to work something out. Any sub should be able to work with a full-range Line Level feed.

If you use a Line Level input you won't have volume control of the sub through the receiver.

That would be available at either Tape Out or Aux Out. Just run an RCA pair (or combined to one male out if that's what the sub amp requires).

Whichever one you use, you won't be able to activate that function for listening as it would remove the input to the sub amp.

If your sub accepts speaker level High Level inputs you could drive it with speaker outputs and yoi WOULD have some volume control, assuming the sub had a way to match its initial volume to your other speakers.

Of course, the manual for your sub might explain some of this, too.

Jan 10, 2011 | Sherwood RX-4109

1 Answer

When I hook up the speakers in the back to the left and right side for the in and out, do I connect the front or rear speakers. do the speakers connect to the subwoofer first then to my receiver or the...


I was trying to find an owner's manual or picture of the rear panel of the sub, but had no luck. The subwoofer is a powered type - or "active" speaker. This means it has a built in amplifier. These active subs usually provide for one or both "low level" and "high level" inputs. Low level signals are usually carried by shielded coaxial cables and have RCA type plugs on the end. The low level is also called "line level". This is an un-amplified signal that might be heard on cheap earphones - but that's about it. It is similar to the output of a tape deck, DVD or phonograph. These signals require an amplifier to be heard. If you have a sub woofer output on your receiver or amplifier, you could run a patch cable between the low level input on the subwoofer and the subwoofer output of the amp or receiver. You receiver or amp may call this output "low frequency effects" or similar. The front and rear speakers would then connect directly to the receiver or amp's corresponding connections.

If you lack low level outputs on the amp or subwoofer, you'll need to run speaker wires from the amplifier or receiver's front left and right speaker output terminals to the subwoofer's high level input terminals. High level signals are speaker connections or amplified signals. These are typically connections that accept bare wire connections. The front speakers would then connect to the subwoofer's front left and right speaker output terminals. The rear speakers connect to the amplifier.

I hope this helps - and good luck!

Nov 24, 2010 | Cerwin Vega AVS-632 System

1 Answer

How do I connect this subwoofer to my reciever


The simplest way is to insert the sub into the speaker wire run -- connect your receiver's speaker output to the sub input, then the sub output to the speakers.

These are the "High Level" connectors on the left side of your sub.

If your receiver has a subwoofer out (either one or a stereo pair) then you'll get better quality sound by connecting that output to the "Low Level" connector or connectors on the right. If you have stereo, then use both connectors. If your receiver only has one subwoofer output, then connect it to the left (may or may not me marked as "mono" depending on the age of your sub)

Hopefully that helps. If it's confusing, post back questions or post the details (brand and model) for your receiver.
If it's helpful, please hit the Thumbs-Up for me!

Oct 16, 2009 | KLH ASW10-120 Subwoofer

1 Answer

I am trying to hook up a powered sub woofer to a yamaha rx-v461 and i dont know what cables go where on the back of the sub there are two speaker ports and there are two plug ins but each speaker port has...


Your subwoofer probably has both high-power inputs and "normal"low inputs. The first are for receivers, which don't have link-level output for sub, so they are able to take already amplified signal as input.
You need to use link-level input of your sub and connect it to subwoofer-output of your receiver. The output is marked as OUTPUT - Subwoofer and is black-color RCA plug (don't confuse with subwoofer INPUT under MULTI CH INPUT).
Receiver has only mono output for subwoofer. If your sub has stereo input (white/red RCA plugs), connect just the left channel to the receiver, it will still work.
Don't connect anything to the speaker output on the sub, you don't need that.

Sep 28, 2009 | Yamaha RX-V461 AV Receiver

1 Answer

Too much bass...low end


Hi, have you tried adjusting the "subwoofer level", and or the "subwoofer cut" controls? Every sub I have ever seen has at least the level control on the back. The "cut or crossover" control determines the frequency at which the sub will start to respond. Additionally, you may need to access the appropriate menu on you reciever and adjust the "low frequency effects" (LFE) output level (assuming you have connected your sub to the reciever's sub output jack.

Hope this helps.

Jun 16, 2009 | Wharfedale SW150 Subwoofer

2 Answers

Want to connect my RCA sub to my yamaha htr-5940 reciever


Subwoofer needs to be enabled through menu on Yamaha. LINE OUT might be turned off or Subwoofer volume set to low or off... (-db level) kinda thing...speaker wires are usually always live etc...

Feb 03, 2009 | Yamaha HTR-5940 Receiver

1 Answer

Nakamichi AV-10 loud thud from subwoofer


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.


Jerry G.



Apr 23, 2008 | Nakamichi AV-10 Receiver

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