Trio15 with Altec 756B full range and Jensen RP302 tweeter
I used the JE Labs OBs, with a powered sub-woofer, for about 10 years. During that time period, it bothered me that those baffles are so wide (almost 3 feet). I felt that they were messing up the rear corners of the soundstage. I started thinking about making a change and if I was going to do so, I would want an integrated solution that would eliminate the need for a separate powered sub.
After considering all of my options and the desire to keep my vintage drivers, I commissioned Pure Audio Project to create a custom build using my 756Bs and RP302s. In both previous implementations, those two drivers were aligned vertically. This was not possible with the PAP OBs, so Thomas from PAP came up with a simple but elegant design which works very well!
Up until a couple of months ago, I was bi-amping my TRIO 15s using Bottlehead Paramount 300Bs on top and a Crown DriveCore 2 amp with built-in DSP crossover on the woofers. That worked fine but one day I decided to see if the Paramount amps were up to the challenge of driving the speakers full-range.
I order to do that, I purchased a pair of 4-ohm 80hz, 12/dB octave low-pass filters from Parts Express. The experiment was a success and much better than expected but only after I reversed the +/- speaker wires on the woofers. Those passive filters put the woofers 180 degrees out-of-phase and I was getting significant low-frequency cancellation from the 756Bs. Note that the ALTEC drivers run full-range and there’s just a cap on the tweeters.
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The DRD amps are working great with my Trio 15s but then I came across your new PAP-C1 crossover. I still have both sets of 300B mono block amps, so now the question is to actively bi-amp or not with the outboard PAP-C1 electronic crossover? Thanks for offering such an outstanding product such as the Trio 15s!
Gerry
New York, USA
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