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I have a new RDX D-7 and Subwoofers seem not to work right

I have an RDX D-7 and it seems that the subwoofers are not putting out much bass. I have tried all the adjustments, but nothing seems to get them to really ''bump''

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Your real problem is that rdx is a "white van" speaker brand and you got ripped off when you bought it. On the box im sure it says $3500msrp but in reality- they are about 50 dollar speakers with weights put in the cabinets to make them seem heavier. People get scammed by these people every day and its an unfortunate fact of life.


Posted on Oct 26, 2009

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Most times it really has to do with the "location" of the sub and the size of the room it's in. Move it to a corner and stand in the opposite corner and you will understand what I mean. It's called a sine wave, how the bass pressure or "sound" actually moves in a particular room. If you still have an issue post a comment and I can help some more. Hope this helps

Posted on Jun 23, 2009

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Is there a way to use the Altec Lansing VS4121 Subwoofer as a stand alone?


Normally these low end system components depend on each other and cannot be interchanged with components from other system. So if one of the components (subwoofer or right control satellite speaker) breaks or gets lost the whole system is unusable...
I was in the same situation. Got a subwoofer from VS4121 without original satellite speakers. I acquired satellite speakers from Altec Lansing 251 which used same connectors but the internal wiring was different and incompatible. Speakers are also glued together so it is impossible to open without damaging it. Obviously there is no service documentation anywhere..
But if you like electronics you can try to make something based on the information below:

Altec Lansing VS4121 connector pinout:
Take the male connector (from right satellite speaker) and number pins in first row from left to right as 1-3, pins in the second row as 4-7, pins in the bottom row as 8-9 and the circle enclosure as 0. Then:
0 - Ground
1 - Speaker Right
2 - Treble (seems just like voltage control but may need to be confirmed: Min=0V; Max=voltage from Volume control Pin 9)
3 - Head Set Right
4 - Bass signal (not sure what the exact original design is as I have not opened the speaker) But seems like they use 50K potentiometer and some sort of RC low pass filter configuration. When potentiometer is set to Min it is shorted with ground. When set to Max it is taking signal from Right and Left Head Set (pins 3 and 5) combined through some larger resistors and low pass filter.
5 - Headset Left
6 - Ground for Headset (grounds 0 and 6 seems to be connected in the subwofer but within the right satellite speaker they seem to be isolated with separate leads to sub)
7 - Power ON/OFF. When OFF or headset jack plugged then 0V. When ON and headset jack unplugged then 5V
8 - 5V Power in
9 - Volume (min=0V; max=5V). It seems they use 50K potentiometer but probably anything >10k should work.

At minimum for standalone subwoofer you will need to implement:
- Power On/Off (switch between pins 8,7)
- Volume control 50k potentiometer (probably anything between 10k and 50k will do) between pin 7 and 0 with variable output to pin 9
- Bass control - join two resistors R (I used 7k) and call this join point A. Attach other ends of the resistors to pins 3 and 5 respectively. Attach 50k potentiometer (I used 10k) between point A and ground 0. Attach Variable pin of the potentiometer to pin 4 (Bass input signal). Attach capacitor C between Pin 4 and Ground pin 0 (I used Electrolytic 1uF with negative end to ground) . Resistor R and capacitor C should make simple passive low pass filter (Google for formula) that should short any frequency higher than 80-120Hz to ground and feed frequencies lower than 80-120Hz to pin 4.

PS: I managed to hack 251 control satellite speaker to somewhat work with VS4121 Subwoofer but that is another subject. All electronic parts were salvaged from old broken TV so total cost was $0 but took several days of tinkering for speakers that I could buy used for $10-20 :)

Jun 25, 2012 | Altec Lansing VS4121 Speaker

1 Answer

I have hooked this up to a working reciever that


Fill in the blanks about the working receiver.

You mention another subwoofer, which suggests your receiver manages the bass and possibly sends most or all of it to the sub.

If it's NOT sending the bass to the speaker terminals you use to drive the AM5 that would explain it's virtually silent bass module.

If those speaker terminals on your receiver can be set to LARGE, do it. Otherwise they assume the speakers are incapable of handling bass.

Apr 02, 2010 | Bose Acoustimass 5 III System

1 Answer

Pioneer Elite vsx-27tx receiver with no bass!?


There may be a subwoofer mute function on your amp. The sub out is nothing more than a preamp output with a low frequency response. It is meant to be amplified by an external amp. Either check your powered subwoofer for operation or look through your operators manual for a sub mute function.

Feb 11, 2010 | Pioneer VSX-27TX Receiver

1 Answer

I recently bought two of these subs and the box they were in has cracked at the bottom whats the proper size box and should I get a bigger vented port box because they seem not to be producing the amount...


Ensure the audio system is capable of delivering output power required by the subwoofer, obviously bigger vented box will result in greater air flow and produce better bass, but it should not be to big. you can try for boxes with more depth.
To enhance the bass you can try connecting a capacitor of 470 - 2200 micro farad across (parallel) the speakers. try out with smaller capacity capacitors first

Oct 08, 2009 | Volfenhag ZX-4812 Car Subwoofer

1 Answer

5.1 surround sound


Here is how you fix it. Its really easy actually take a look at your Subwoofer 99% of the time you can control two controls for your bass somewhere around the Subwoofer. If you raise the volume of your Subwoofer you'll get more bass. Try it and let me know how this works out for you alright.

Oct 03, 2008 | Audio Players & Recorders

1 Answer

Jl 12's w3 not all types of basses sound right


zzedly only asked only one good question, here is what should've been asked.

What size is the enclosure?
Sealed or ported?
What frequency is it tuned to if ported?
How much power are you running?
and
What frequency is your LP crossover set to?

Mar 14, 2008 | Jl Audio 12W3 Car Subwoofer

1 Answer

Subwoofer help


hard to tell whats causing this .Just curious make sure speaker wires going to subs are POLARIZED meaning positive from amp is with positive at woofer and NEGATIVE is with negative at woofer.When these are crossed and when volume is raised you will hear the bass cancell each other out..

Dec 06, 2007 | Car Audio & Video

1 Answer

Cerwin Vega V-10S Subwoofer doesn´t sounds good


dear "rai17"

This, to me, is most likely the voice coil inside the driver rubbung against the yolk plate, or possibly the spyder slapping the metal plate underneath it, or the amp-(if it has one?) getting tired. this can occur from poor build quality, or playing the subwoofer too loud. depending on how much it cost you, you may want to get it repaired(voice coil re-alignment or something or new amp). But the way it seems, it is probably the driver itself. subwoofers get looser as they break in. This one may have been over-broken....sorry

I hope this helped clarify what is happening!

Oct 09, 2007 | Cerwin Vega V-10S Subwoofer

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