Originally Posted by Decadent_Spectre
Did you design the XO for the current system?
Yes. It was made as simple as possible with passive and active components and a "systems" approach.
The Klipsch K1133 driver, manufactured in Hope. has a special phase plug and suspension that allows it to respond slightly below 300 Hz. but it tanks at 5 khz. This is normally what one would expect from a heavier mass Phenolic driver, but it's Titanium. This makes it's transient response in the lower midrange much faster than a phenolic. (2-way designed, Berylium types can't be crossed this low). This was important to me to fill in the gap left by no longer having a huge midbass horn with a 12" woofer/phase plug arrangement from the Peavey MB-1. So, the K-402 horn/K1133 driver combo has an ACOUSTIC 3rd order rolloff at 320 Hz. and a 1 st order MASS rolloff at 5,000 Hz. By simply adding a single poly capacitor value at the mid horn input, I got a 4th order combined electro-acoustic rolloff. For the tweeter, a single poly cap value was all that was required as a First order ELECTRICAL highpass to match the first order MASS rolloff of the midrange at 5,000 Hz., typical of all compression drivers with CD horns. Broadband sensitivities of the mid and tweeter are within 1 db each other and are driven by the AV receiver amplifier front R and L channels (same voltage on both). For the woofer section, I needed a higher voltage gain because of about a 5 db difference in sensitivity from the mid-tweet section. Also I needed 4th order rolloff at 320 hz. to match the Mid "rollup" so I chose a Behringer DCX2496 as a 2-in, 2-out device. I used a 4th order Linkwitz-Riley filter and added a minus 5 db PEQ filter at 140 Hz. to cut the peak inherent in these types of "short horn" cabinets, while boosting the bottom en Plus 9 DB at 60 Hz. to make up for the fast rolloff of this type of bass horn cab below 90 Hz.. This is a good match for the DTS-10 which doesn't like to work much above 60 Hz.. The Behringer feeds an el cheapo 6 watt/channel Lepai 2020 Chip amp, keeping in mind that all it needs to put out is an average of 25 Milliwatts to give me an average of 85 db at my sweet spot. Since this represents about 1/240th of the little chip amp's power output, it still leaves me with 23 db of headroom for bass peaks. Direct Radiator dudes have a hard time getting this. Horn guys like me understand that DR guys need at least 100 times more power to achieve similar levels with the inherent higher IM distortion from the extra cone movements. Next step is to go all active with Mini DSP's, time delays, and a 6 channel amp, leaving the Behringer available for a 2-way, 2.0 system experimantation to play all my old vinyl on a new turntable.
Hope this makes sense........oh, and I should mention that twin DTS-10's (front and back wall centers) give me a DECADENT spectre of sub bass!! LOL.