I’m proof that a DBA can work with Maggie’s, I built my system around the concept. It’s all active with a mini DSP, 8 channels (4 subs) with 12 biquad filters on each. The filters were generated with an Earthworks Mic that measures +-30k using Room EQ Wizard, results plugged into Multi Sub Optimizer without any restrictions. The results are breathless, total seamless integration. I had a friend over who notes that the 20.1’s were full range speakers and asked me to turn off the subs as he couldn’t hear them. I muted them and played the same piece and he couldn’t believe the difference. I just wanted to affirm the statements above that DBA’s work wonders and is the only real way to tame low end room distortion and seamless integration in my opinion.
- ...
- 33 posts total
https://positive-feedback.com/audio-discourse/magnepan-focus-group-event/ Quote.... "The bass unit was about 3 feet tall and about 1 foot wide. The cabinet or structure consisted of a V shaped open baffle with 8 total drivers—4 vertically mounted dynamic cone woofers on each side of the V. These woofers were approximately 6.5 inches in diameter. Though there has been several dynamic cone dipolar designs attempted before, Wendell commented that this was a unique design that utilizes DSP and would eventually be patented. Yes, I said DSP! " |
To what gnjtack said, I'd add that the planar panels are only 12" wide and use technology adapted from the 30.7. So you could think of it as a 30.7 with compact dynamic dipole woofers. Also that the DSP is used only on the woofers -- if Magnepan commercializes the concept, it will come with DSP and a high-powered woofer amp (the panels will be powered by your own amplifier). |
The open baffle servo-feedback bass system used in the GT Audio Works magnetic-planar loudspeaker mentioned by faxer above is the GR Research/Rythmik sub. It is available separately from both GR Research and Rythmik, and can be used with any loudspeaker. It is THE ultimate sub for all planar loudspeakers, as it’s dipole characteristics make it possible to blend seamlessly with them as no monopole woofer can (even in swarm fashion). It also features the Rythmik servo-feedback system, which when combined with the virtues of ob bass, creates the best bass reproduction you’re ever likely to hear. It has found favour with owners of Maggies, Quads, Eminent Technology LFT’s, Acoustats, and of course GR Research speaker owners. But the Magnepan "Project" loudspeaker is a complete package, including the "midbass coupler" used in the 30.7, as well as the fantastic Maggie ribbon tweeter used in the 3.7i/20.71/30.7. It will be interesting to compare the Magnepan OB woofer system with that of GR Research/Rythmik. The GRR/R uses 2 or 3 (or more!) 12" woofers per side, the Magnepan eight 6.5" per. The GRR/R uses servo-feedback woofers, the Magnepan DSP. Should be interesting! |
- 33 posts total