Subwoofer input sensitivity--->line vs speaker - AVS Forum
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Old 11-26-2014, 11:03 AM - Thread Starter
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Subwoofer input sensitivity--->line vs speaker

I have a martin logan dynamo sub with both RCA and speaker level inputs. I noticed that I only have to turn the gain up to 2 or 3 using the RCA inputs vs 6 or 7 using the speaker level inputs. Is this unique to my ML sub or could this be a functional issue (although i have triple checked all connections).
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Old 11-26-2014, 11:47 AM
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I noticed that I only have to turn the gain up to 2 or 3 using the RCA inputs vs 6 or 7 using the speaker level inputs.
This only shows that the amp gain structure is different with the two inputs, which is of no consequence. Use the RCA input. The only reason for the speaker level inputs being there is so you can use the sub with an older receiver that doesn't have a subwoofer line level output.

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Old 11-26-2014, 11:52 AM - Thread Starter
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Originally Posted by Bill Fitzmaurice View Post
This only shows that the amp gain structure is different with the two inputs, which is of no consequence. Use the RCA input. The only reason for the speaker level inputs being there is so you can use the sub with an older receiver that doesn't have a subwoofer line level output.
Thanks for the info.

I'm using a T-amp with only speaker level outs. My source (DAC) only has one 3.5mm output. My choice was to either split the signal from the DAC (1 to amp, 1 to sub) or run speaker wires from the amp to the sub, which I was told was the lesser of two evils.
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Old 11-26-2014, 11:59 AM
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I'm using a T-amp with only speaker level outs. My source (DAC) only has one 3.5mm output.
Your issue with that arrangement is that there's no provision for high-passing the mains signal. The sub amp may have high passing using the speaker level outs, but that's not the best way to do it. The signal should be split into lows and highs prior to the amps.

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Old 11-26-2014, 12:28 PM - Thread Starter
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Your issue with that arrangement is that there's no provision for high-passing the mains signal. The sub amp may have high passing using the speaker level outs, but that's not the best way to do it. The signal should be split into lows and highs prior to the amps.
The folks at REL would disagree, but I think you're right...I just have never liked AVR for music
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Old 11-26-2014, 02:44 PM
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The folks at REL would disagree,
I can't imagine why. In any event, the best way to do what you want to do is to place an electronic crossover between the DAC and the amps.

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