Connecting a subwoofer to a Joule LA-150

Agree with SNS. If you have only one source, such as a CD player then I suggest putting the BAM between it and the preamp and then using the second outputs of the preamp for the sub. However, I have two sources, CD and Analog so I can't do this. Perhaps using two BAMs could be done? Don

With only one source, Don's method works, the other preamp output won't be filtered.

With two sources you are using tape loop on preamp, both ouputs are filtered by BAM. using this configuration the BAM essentially remains between the source and preamp. I can't think of a way to maintain BAM between source and preamp and add subwoofer without it being filtered by BAM on preamp outputs. The BAM would have to go between the preamp and amp.

Yes, with two BAMs you could connect each source to it's own BAM, BAM outs into source ins on preamp, preamp outs won't be filtered. I'm also wondering if you could add a second set of RCA ins and outs to an existing BAM. Both sources would go directly into BAM, out into preamp, no filtering at preamp outputs. I think I asked Bobby about this some years ago, can't recall his comments. You could also use a balanced BAM (has two complete circuit boards), one circuit board for each source, outs into preamp ins. Preamp outs no filtering.

Ultimately, best way to do this is to put the BAM between preamp and main power amp so you can use the extra pair of outputs on the Joule Preamp to run to your sub. Is it a perfect solution? Maybe not? But any small loss in performance (generally fullness IMHO) of the BAM from not buffering it is made up for in running a good stereo sub-woofer system (assuming the room is large enough).

I have a customer with such a set-up (Joule Preamp, VZN-100s VSM-MXe's and a 2 channel large sub-woofer system - BAM placed between preamp and the Joule OTLs) and... it sounds great. With a low crossover point on the sub (very flexible Bryston sub crossover is used for the subs) the integration is excellent.

The only other possible set-up I can think of is that if you have a sub or sub system that has some type of DSP xover system that can be programmed to make up for (un- equalize) the BAM's signal in additional to EQing the subs output for smooth response in the room. This would allow the BAM to remain in the tape loop - fully buffered - so you can get the best of both worlds.