What is the best way to hook up a subwoofer
I own an ARC Ref 5 line stage and also have a self powered sub woofer. I mention this because we may share similar issues. I just checked the ARCDB web site and note that the SP-9 has two main outputs. Al asks the correct questions. Also is the sub woofer self powered?? Does the sub permit you to adjust low frequency rolloff, phase and loudness. These adjustments are important in order to blend the sub with your main speakers. If the sub does not provide these types of adjustments, you may need a separate cross-over. Also, very important point. What is the input impedance attributes of your amp and the sub? The ARCDB web site mentions that the SP-9: "[r]ecommended load [should be] 60K ohms and 100pF. (20K ohms minimum)." In other words, if the combined input impedance of your amp and sub are less than 20K ohms, you will overload the SP-9, which could cause sonic degradation. I've posted a number of comments about this issue and provide the formula for computing combined impedance, as well as the somewhat unique solution that I employed. After answering the questions raised by Al and me, I think the group can provide better advice. |
Pdspecl and Bruce (Bifwynne), I had looked at several pictures of the rear panel of the SP9, including at ARCDB.WS, and they show only one pair of main outs (plus two pairs of tape outs). Excellent comments otherwise, Bruce. I would just add that according to the specs shown in Stereophile's review, while a load capacitance of 100pf (or less) is recommended, up to 1000pf is acceptable. That would seem to make sense given the 250 ohm nominal output impedance, and might particularly be a significant fact if a y-adapter turns out to be the best approach. Best regards, -- Al |
