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High Efficiency Speaker Asylum: DEQX and imaging. by Don Reid

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DEQX and imaging.

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I recently installed a DEQX PDC-2.6 digital processor/crossover in my system. It was a chore for me to learn how to install it. Speakers are AER MD3s in Oris 150 horns and the bass corner horns of Klipschorns. The DEQX (pronounced DECKS) allows me to program a linear phase, 160 Hz crossover with the high pass to the Oris 150s rolled off at 78 dB/octave and the low pass to the Klipschorn bass bins rolled off at 96 dB/octave. The diaphragms of the AER drivers are about six feet in front of the 15" woofers in the Klipsch. The DEQX time aligns them to within 1/8", or less than one-one hundredth thousandth of a second. Passes the WE tap dance test. Calibration and calculation of correction filters similarly correct speaker phase and frequency response,room resonances, etc.

The AER MD3s in Oris 150 horns coupled to Klipsch corner horn woofers were before the DEQX splendid speakers in many ways, but they were not imaging champs, but I hadn't ever expected them to be. Installing the DEQX was a revelation. My beloved horns now imagine better than any speaker I've owned, a considerable number, with the exception of a pair of floor to ceiling full range electrostatics I owned up until 1988.

The image not only retains its three dimensionality and verisimiltude to outside of the Oris horns but even through and outside the side walls which are quite near the Oris. It just blows my mind. The image has good depth and height and precise localization of voices or instruments is at least pretty good.

I never had any idea how well my horns could image before the DEQX. Those who have never tried it or a similar digital crossover, phase, time, frequency response, room correction processor might be very surprised to find out how well their speakers can image. I sure was.

Since this is a response to a question about amplifiers and imaging I'll mention that I use a pair of Cary Audio Design 2A3 SET monoblocks (5 watts/ch.) on the 112dB/W/m sensitive AER drivers in the Oris horns and a highly modified New York Audio Laboratories Moscode 600 tube/ss hybrid amps (300 watts/ch.) on the 104dB/W/m sensitive Klipsch bass corner horns. My patch cords and speaker wire are mostly DIY of my own design.

Good Hearing and Listening,
Don Reid


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Topic - Amplifiers - how do they affect the image debate? - freddyi 08:48:21 01/4/05 ( 16)