No sound from bose 321

Try a full system reset to start with:

1. Turn the system off
2. Unplug the Acoustimass module power cord from the power outlet. Wait 30 seconds
3. Reconnect the power cord
4. Wait for the words "Bose 321" to appear and disappear from the display
5. Retest the system

The Bose 321 have an optical in port for external media.

https://www.techwalla.com/articles/how-to-reset-bose-321-gs
This may be of use.

Here are 3 things to try and an if all else fails at the end.

1) Make sure the TV is set to the correct Video Input to see the video from DVDs on the Bose system.
• Make sure a DVD is in the disc tray.
• If the TV is connected to the media center using the HDMI cable:
Switch from one Video Input to another and then back to the original input.

2) Turn everything off, then:
Turn on the TV and set the TV Video Input for the Bose system video.
Turn on the Bose system and press DVD.

3) Turn off both the TV and the Bose system and then:
Unplug the HDMI cable from both ends.
Disconnect the power cables from both your TV and the Bose 321 system.
Re-connect power to the TV and to the Bose 321 system.
When the Bose 321 system startup message disappears from the display,
re-connect the HDMI cable to the TV then Bose 321 system.
Turn on the TV first, then turn on the Bose 321 system.

If all the above fail then disconnect the HDMI cable that connects the TV to the Bose 321 system and reconnect the two using a Component cable, an S-Video cable, or the Composite cable provided with the system.


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Cheers

Andy

I had the Bose 321 same issue call 877-210-3782 they will set U up with shipping "email U the Labels UPS" If out of warranty total price which includes shipping to and fro is 191.28. Better than replacing at over 700 to 1000 bucks hope this helps.

This depends on the source. If this happens internally (from a DVD in the 321) then the problem should be able to be resolved by just resetting the 321. (unplug the power cord from the sub for 30+ seconds) -If this is from external sources like a cable box, believe it or not, you can reset the cable box the exact same way. If resets don't fix this (and this is external) then check the cable box's settings for a/v delay compensation.

check the power suply behind the acoustimass set to 115v, not to 230, that will solve you problem

Hi...
Get new audio cables . It seems there's a broken Ground (shield ) wire somewhere in the cable. NO ground means HUM usually

NO NEED TO TEAR APART OR REPLACE THE UNIT! JUST TURN OFF THE UNIT, LEAN IT FORWARD AND A LITTLE DOWNWARD AND HIT THE LOAD BUTTON AND IT WILL OPEN. THAT'S THE TRICK!

In short, you can. I did it last night. My Bose 321 DVD player is junk and it's always been junk, but I love the sound sytem. Last night, after the thing gobbled it's last DVD, I went through the whole, unplug, wait 5 minutes, plug back in, etc. and it still wouldn't eject so I ripped the DVD tray out of the thing with a pair of pliers, recovered my DVD, and slammed the tray back in, stripping all the gears and screwing up the motor in the process.
BUT, I disconnected the video cable from my Bose and plugged it into the video out on my el-cheapo Tru-Tech $99 DVD recorder. Then I ran the audio out cables from the Tru-Tech to the Aux 1 inputs on my Bose 321.
When I want to watch a DVD now, I put the DVD in my Tru-Tech, turn on the Bose, switch it to Aux 1, and I get a great picture and the Bose sound. Best of all, I don't have to plug and unplug that sorry Bose system everytime the wind blows.
They used the absolute cheapest DVD player they could get their hands on--a Toshiba model--for all the Bose 321 older models. Every single person who bought one has had these same troubles and they've made no offer to fix them.
This was my first and last Bose because of that and I hope more people stay away from Bose until they get their act together and protect their customers. $1000 for a system that eats DVDs like M&M's is ridiculous.