Hmmmmm,,,, John ,Originally Posted by JohnW
- Only because I have such great respect for your wood-working abilities , do I suggest something a lot more ambitious,( both sonically and build-wise ) .
- The ***sonic purity of a round horn*** just begs to be used with an MTM type system .
- How about something like this kludge-up ? It's an asymmetrical, MTM-based, "fanciful-thought" project ( for the time being ) .
- It's meant to be a biamped / triamped ( only ) system ( just for the sake of simplicity ).
- The 2245H and 2206 ( or other qualifying 12" ) are run paralleled, with various means applied to restrict/blend their respective response curves.
- ( ie; the 18" "working" in a ported cabinet would have a large inductor on it to roll down its midrange ( earlier than the 12" ) / while the 12" working in a "largish" sealed doghouse slowly rolls out its' LF response ).
- You'd need to sell your 2202 midrangers ( I know, I know this is all a stretch) and obtain midwoofers instead, like the 2206H, to make this sort of MTM concept workable .
- The midwoofer ( 2206H ? ) should be located as close to the horn as possible / with a center to center spacing ( 2245 to 2206 ) of around 34" as a reasonable goal.
- Another ( perhaps conflicting ) design goal is to use a ( large enough ) round horn that will support a crossover point as low as 600 to 650 hz ( with minimal low-mid "correction" EQ ) .
- Whatever 12" midbass woofer is used , it needs to have a similar efficiency to that of the 2245H. It also needs to offer pretty linear output ( from @ 80/100 hz to 650 hz ) when housed in its' sealed ( @ )1 cu' subenclosure. For Xmax reasons, a long coil winding depth ( > than or = to .75" ) offers the best compromise for this job description . ( Aquaplassed cone, a deeper gap, higher compliance surround and higher BL factors are also desirable attributes / though much tougher to obtain through eBay type purchases ) . The ME120H or 1200Fe do come to mind as my first choice twelves to explore ( when designing with specs. from a page / and when referenced through my own hands-on experience with the ME150H ) .
- I believe you'll need to design & build a small round waveguide for your 2403 driver to maximize the imaging capabilites of a 4way system . This will most likely entail copying the initial "compression-chamber" of the 2404 tweeter to achieve the correct, initial compression characteristic necessary for a bit of diffraction.
- The original image belongs to "pantaNS" and is of his 4-way system that uses a 2245H and a 2206H ( among other things ).
Okay , not yet ? maybe in a couple of years.
Reply With Quote