Originally Posted by ioanni
Alright thank you very much both for the answers. It seems that there is a consensus that if I buy a JBL M2 it should be the way Harman was intended, with the Crowns and London BSS to have the full experience, otherwise it would be subpar. I was reading some posts in the minidsp website from people that use a miniDSP openDRC as a crossover for JBL M2 or another forum about using Audiolense Digital crossovers, with relatively good results, irrespective of which amplifier is used. However this is always subjective unless there are comparisons anywhere in this thread or others with custom solutions vs the full Harman chain? Am I also correct to say that Harman's ARCOS that is used in the JBL M2 Room Eq. is one step up even from Dirac? In the case of an external pre-pro or receiver higher up the chain for sound processing, is then common practice to bypass the REQ for any JBL M2 speaker, and let the Harman system do its own thing?
At the end of the day if M2s are an overkill for a medium sized room I might as well keep the 10 inch Tannoy, arguably an overkill too, rather than going to an 8 inch driver for the sake of simplicity. Unless even the JBL LSR708P with bass management and subs is also so much better for audio and home cinema? Thank you in advance.
If you buy the Crown amps with the processors built in, you don't need the BSS box. Beware noisy fans.
The current version of Sound Filed Management uses Room EQ Wizard (REW). Essentially it involves taking measurements of each subwoofer in the system at each listening position using REW and a calibrated mic. Those measurements are then sent off to Harman, where the number crunching is done. The calibrator gets back a long list of optimal settings ranked in order of evenness of bass vs. output. In Kevin's Voeck's system the second set of settings had the best balance of output vs. evenness. Those are then input into the SDP75 and voila - SFM!
All of this is in beta - they are still working out the particulars and what the costs will be. There is supposed to be a class for advanced dealers and calibrators sometime late this year / beginning of next.
I used Tannoy monitors years ago when I worked as a recording engineer. I don't know your exact speakers, but I would say if you value neutrality i.e. flat on and off axis response, you will not find many speakers as good as or better than the JBL LSR7 series. Plus, the compression driver and wave guide horn are an entirely different thing than a coaxial driver. Imaging and driver integration with proper wave guides is something you will not forget once you hear it done well. JBL and Revel excel at using science to produce some of the best measuring and sounding loudspeakers.
Dirac and ARCOS are for room correction EQ. I think you are still confusing the crossover and processor control needed for the M2's to operate properly with Room Correction EQ. You use the processors in the Crown amps or BSS London to handle the crossovers and processing to make the speakers work properly. Then you use Dirac or REW to smooth bass response in the room. I say again, M2's are passive speakers and a part of system that need to be treated as such. In a small room where you will not be playing them very loud, I think you would be getting way more speaker than you need. You need to sit far enough back from them for driver integration. And, research has shown, the use of multiple subs even with full range speakers helps smooth bass response in the room to more listening area. If you have monitor speakers that are flat down to 80Hz and let a pair of subs handle low frequency response below that, you save money on full range speakers and the high wattage power amps necessary to drive the woofers.