Connecting Mono Speaker-level Output to Stereo Speaker-level input on Active Subwoofer - AVS Forum
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post #1 of 5 Old 01-23-2013, 06:14 AM - Thread Starter
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I just replaced an old Sony 5.1 (with pre-out subwoofer) with an Onkyo HT-290 (with speaker-level mono subwoofer output). My subwoofer is a PSB Stratus Subsonic 7. This active subwoofer has stereo line-level inputs AND stereo speaker-level inputs. I need to connect my mono speaker-level output from the receiver to the stereo speaker-level input of the sub.

The PSB manual does not have any diagrams to represent this configuration. Nor does the receiver since it was meant to be used with a bundled passive sub.

I have stripped a couple inches off the end of the subwoofer speaker wire and connected the positive terminals and negative terminals in parallel (using their respective wires). Is this a valid connection?

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post #2 of 5 Old 01-23-2013, 06:59 AM - Thread Starter
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Having a hard time finding impedance information for this sub. But, it may be a 4 ohm sub. So, I may be better off with a series connection?

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post #3 of 5 Old 01-23-2013, 01:18 PM
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If I understand correctly you want to drive a powered sub with a sub amp contained within your AVR. That's not the best idea, but I guess you could do so. Run the speaker out from the AVR to the one of the speaker level inputs of the sub amp, it doesn't matter which.

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post #4 of 5 Old 01-23-2013, 01:51 PM
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Quote:
Originally Posted by cedarrapidsboy View Post

Having a hard time finding impedance information for this sub. But, it may be a 4 ohm sub. So, I may be better off with a series connection?


What Bill said.

If you are connecting to a powered sub, the input impedance will be very high even at the speaker terminals because it's converting to a line level signal so it doesn't blow up the amplifier inside the sub. The impedance of the driver is irrelevant because your receiver's amp will not be driving it, the sub's amp will.

You should only connect to one speaker input on the sub. Like Bill said..
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post #5 of 5 Old 01-24-2013, 08:53 AM - Thread Starter
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JHaz, Bill,

Thanks for the replies.

I had connected to both terminals because that was the recommendation in the manual when using the line-level inputs. I just finished calibrating the speakers and was happy to see the sub performing as well as it did with the previous receiver (as far as the sound meter and calibration tests are concerned).

I'll go into one terminal and observe how that sounds.

My assumption is I'm still better off with my PSB active sub than the bundled passive sub. It hasn't even been unboxed.
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