How to Fix a Bose Acoustimass 6 Impedance

By James T Wood

The Bose Acoustimass 6 speaker system is compatible with both 4 ohm and 8 ohm impedance receivers. The Acoustimass module is a hub for all the speaker input from your surround sound receiver, which it then pipes out to the individual speakers. There are no internal adjustments that can be made in the Acoustimass module to change the impedance. If the audio sounds distorted, or if your receiver is getting hot or switching off, then you need to change the impedance setting on the receiver to fix the issue.

Step 1

Consult the manual for your receiver to see which impedance rating(s) it has. Mass market receivers will be rated at 8 ohms, while high-end receivers may be 4 ohms. The lower the impedance number the less resistance the electricity meets between the receiver and the speakers. If your speakers sound weak and have a low volume, the impedance setting from the receiver may be set at 4 ohms, which will send out less electricity due to the lower resistance. However, if your speakers sound distorted and too loud, then your receiver is likely set at 8 ohms, which uses more electricity to push against the resistance.

Step 2

Switch the impedance setting on your receiver, if possible. If you have a variable impedance receiver, try the other setting to see how it affects the sound coming through your Acoustimass 6 speakers.

Step 3

Set your receiver to send the right digital signal to your Acoustimass speakers. Bose recommends that the digital signal for the left, right, center and rear speakers be set to "large" in your receiver. Set the low-frequency effects -- or LFE -- to "on."

Step 4

Contact Bose support if the impedance between the Acoustimass module and the individual speakers is wrong. You can call them at 1-800-999-2673 or contact them online (link in Resources) for help.