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Subwoofer connection to a tube preamp

What is the best way to connect a subwoofer to a tube preamp that has no sub out? I have an Audio Electronic Supply (Cary)AE-3DJH preamp and would like to connect a sub to it. My sub has line-in (R&L) and line-out. However, the line out has a high pass filter which cuts-off at 80 HZ. Would it be better to use a single RCA-Y or a Stereo RCA-Y to provide a line input to the sub or would it be better to use the line in and out on the sub. My main speakers are Klipsch La Scalas and are being driven by a Cary Rocket 88R tube amp. The system response is lacking in bass so I would like to supplement it with a sub. Any suggestions? Thanks, Larry
lkitchell

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kr4
3,650 posts
 
"My sub has line-in (R&L) and line-out. However, the line out has a high pass filter which cuts-off at 80 HZ. "

That's what it is supposed to do: cut off the lows from the main speakers so that only the sub is reproducing the bottom octaves. How well it works depends on the quality of the unnamed sub, of course.

Kal
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