Pete Schumacher ®
, 11-14-2008 at 03:18 PM (4239 Views)
Well, I've been contemplating my "ultimate" system, ultimate within a reasonable budget, that can handle a 250W amp without batting an eye, and cover the full spectrum of HT effects to the subtlest nuances of the finest musical recordings. I intend this to be 100% passive XO. After the successful implementation of the Centilana and the Duelund topology, it would seem the only thing missing would be to anchor that design with a very good bass driver.
This will definitely be an all PE design. I'm thinking Dayton dual RSS265HF or a single RSS315HF for the lowest octaves, to 200Hz. To handle the upper bass, lower mids, I'm having a hard time not looking at the Usher 7 or 8 inch woofers. Their performance over the decade from 100 to 1000 Hz is quite amazing. I'd like to transition the midwoof to a dome mid, either the TB 3" at 600Hz or the RS52, around 800Hz, and then hand off to the Dayton RS28 at around 2500Hz. All acoustic XO slopes will be quasi-2nd order to allow that Duelund approach to take place over the entire spectrum.
The issue is in the execution for sure. I guess I'd need to start from the "ground" up, getting the Sub and midwoof to play together seamlessly. With the 2nd order slopes, there will be a lot of overlap among drivers, sub to mid, midwoof to tweeter, each affecting the driver levels in their passband. With the Duelund, the woofer and tweeter are in-phase, each 12dB down at their XO point, smack dab in the middle of the midrange band. The mid then is adjusted to fill in the broad dip between woof and tweet, allowing the mid to run 6dB below reference, and in-phase with both the woofer and tweeter over the midrange band. The addition of another driver below the woofer will certainly affect how the drivers overlap and constructively build the total output spectrum.
I'm anxious to build again. It's been a while!!!
Now that my home remodeling is almost done, I guess I need to get out the measuring gear and get everything set up again.
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