Passive sub to receiver?

Ab1979

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I have a 5.1 home theater set up with an onkyo receiver and a 10” passive in wall sub powered by a dedicated sub amp. However, the sub has very little power and I’m afraid I didn’t connect the onkyo with the sub amp correctly. Here is the sub amp:
EE5E6274-C920-49D2-ACDC-35E24693B7D3.jpeg

and here is the onkyo:
FEA33A8B-A038-401E-804F-F947EB84819B.jpeg

Any help is greatly appreciated!
 

Ab1979

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what model is the sub amp?
It’s the T100 from TruAudio. Apparently it’s super high quality and the subwoofer should blast, but it doesn’t. The passive subwoofer is a speakercraft 10in in-wall.
 
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Wayne_j

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The subwoofer pre-out from the Onkyo would go into the left input on the amp. dip switches 3 and 4 on the amp should be in the lower position. The speaker output ( R+ and L- ) from the amp would then go to the subwoofer. The subwoofer output on the amp is passive and would go to an active sub. You should not use it for your setup.
 
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Ab1979

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The subwoofer pre-out from the Onkyo would go into the left input on the amp. dip switches 3 and 4 on the amp should be in the lower position. The speaker output ( R+ and L- ) from the amp would then go to the subwoofer. The subwoofer output on the amp is passive and would go to an active sub. You should not use it for your setup.
The subwoofer pre-out from the Onkyo would go into the left input on the amp. dip switches 3 and 4 on the amp should be in the lower position. The speaker output ( R+ and L- ) from the amp would then go to the subwoofer. The subwoofer output on the amp is passive and would go to an active sub. You should not use it for your setup.
I will try that out today to see if it works. I haven’t tried that configuration, so I’m very hopeful. Thanks!
 

JohnRice

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The subwoofer pre-out from the Onkyo would go into the left input on the amp. dip switches 3 and 4 on the amp should be in the lower position. The speaker output ( R+ and L- ) from the amp would then go to the subwoofer. The subwoofer output on the amp is passive and would go to an active sub. You should not use it for your setup.
Correction, #4 should be up for full range. That's a high pass filter, not a low pass filter, so engaging it will eliminate bass entirely.
 

JohnRice

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Also #1 and #6 should be down. I'm guessing it has a volume control on the front, which ideally you would engage just like a normal powered sub. #6 is to disengage the service mode.
 

Ab1979

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Reporting back with what appears to be good news! I wired the sub amp per the instructions above (with the JohnRice mod) and the sub is hitting pretty decent. I tried music via Spotify and it hits. I streamed a movie on Netflix and Disney+ and definitely felt a deep thump in certain scenes. It’s only a 10in sub, but thanks to you guys it adds a nice touch to my 5.1 system ...I finally have a home theater :)
 

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