Altec Lansing Bx21 9volt sub

Hi Dan Bushey, I'm glad you found a solution, what does not close me is that Altec Lansing, which needs a DC 18volts and 650mA power supply, works with a source that delivers 9 volts and 19KW (???)
Maybe it will be 19 volts and 1.9 Amp?
Comment please
Greetings Franco Dosil

Hola Dan Bushey, me alegra que hayas encontrado una solucion, lo que no me cierra es que Altec Lansing, que necesita una alimentacion de DC 18volts y 650mA, funcione con una fuente que te entrega 9 volts y 19KW(???)
Tal vez sera 19 volts y 1,9 Amp?
Comenta por favor
Saludos Franco Dosil
https://www.manualslib.com/manual/4749/Altec-Lansing-Avs300.html?page=2

http://img.4pk.ru/26663.pdf
Why post the same question twice?

is it possible that you may have plugged the speakers into the microphone or audio input jack on the computer instead of the speaker/headphone/audio output jack?

It plugs into the input on the sub woofer speaker. If you don't have
a sub woofer speaker don't worry about it.

Sub woofers have small amplifiers , not transformers. The amplifier is removable and replaceable. The The overall size and the output wattage are the spec's you need . The output wattage is on the label which is attached somewhere on the speaker. You do NOT need to replace the amp with the Altec Lansing brand. Have you contacted Altec Lansing to purchase a replacement Amp? That's where I would start. If they cannot help you I would Google replacement amp sub-woofer, Altec Lansing model MX5021.
good luck

I have the same problem I tested the power volume controller with in my friend sub-woofer and same issue, is not the sub-woofer neither the speaker, is the power volume controller definitively.

The problem I have found is the contact glue between the back panel and circuit board inside the sub woofer. The glue becomes conductive after some time (2 years..!!) and needs to be scraped away from across tracks, you can tell the problem areas as the glue is pale yellow but goes brown and conductive over time. Good luck.
Regards
aj

I found that one of the pins of the plug connecting the sub-woofer was bent and the plug was not seating properly deep in to the slot. Every pin has a specific task to the sound system, it seems. I set right the bent pin with a long needle gently and re- plugged in to the woofer's slot. After that every thing works amazingly. All it requires is patience and application of mind for a while exclusively focused on the problem.
Thanks and regards
M. Narayanan

check the plug that goes directly to the altec box. or it could be the wire is the culprit..

hi there are fast checkings for you: Quick Connect Card http://www.alteclansing.com/downloads/641QCC.pdf manual: http://www.alteclansing.com/downloads/641_MAN.pdf is the system working fine exept the sub? my guess: the headphone jack works fine then the speakears are too if soo then the sub amp is bad or some connection is torn try opening the sub and see if everything is hooked right and if soo then the amp is the problem every electronics shop can fix this good luck