aka: Chamber of Horrors


Well, here it is, the rest of the chamber of horrors. The test bench you just saw is to the right and slightly behind the camera. This room was a 2 car garage measuring 20' by 20'. The entrance was on the right wall. The wall facing you is 19' away and is 17.5' wide. The ceiling is 8.5' high. The walls are block and hence 95% soundproof. I've had SPL's as high as 125 dB inside that were barely audible outside at 2 AM. That was for experimental purposes only.
For scaling reference, the corner horns are 58" tall and 32" wide; the reflex enclosures beside them are 48" tall and 24"x 24" on top. The television monitor is a Toshiba 48 inch LCD. Sure looks small at this distance.  The purple line arrays are sitting on top of their respective woofers.  They were an experiment and now arwe used for the television.  I'm not into rattling the rafters during movies.  In fact, unless a movie has an exceptional soundtrack, it's viewed using the monitor's internal speakers.  The vertical dispersion of these arrays is about 30 degrees but the horizontal is around 120 degrees which gives very good sound to anyone sitting in the  sofa on the right.  They're powered by two channels of the Pioneer VSX-9300 receiver atop the Mc2300.  


OK. Now for a little tekky stuff. The details will be reserved for future pages.





I won't even touch the horns here as I can easily get carried away on that subject. As for the reflexes, the woofers are Crunch® 15". Nothing special, but gluttons for punishment and incredibly smooth. Well, almost gluttons, as they just bottom out with kick drum bass at about 450 watts peak (225 rms), as measured with a true rms wattmeter with squiggle tube display. The bass sections of either system are powered by the MC2300® on the floor.  The horns are padded down about 12 dB with respect to the reflexes. They (the horns) give me the punch and realism only a horn can give and unload at 34 hz. The reflexes get me down to 20 Hz. More details on them in a subsequent page but outside, they are flat +/- 1dB at a distance of 12 ft. In the room that's a different story.

The yellow drivers are the midranges in the famous d'Appolito configuration with the exception that they are reflex loaded for better output below the crossover point of 125 Hz. The tradeoff was transient response. The decision in that direction was governed by the fact that I watch a lot of older movies and shut off the 4 woofers and use the midranges as full range.  The midranges and tweeters are powered each by a McIntosh® Mc250®. Yes, the system is tri-amped.  The d'Appolito systems are prototypes for a subsequent system built by a friend, Jerry, and myself and are tri-amped also.  The rest of the video stuff is in the cabinet under the monitor and comprises of a VHS, Laser Disc Player and a DVD player. The bottom Mc250® and C26® preamp (not shown) were purchased in 1974; never seen a repair shop and all original with the exception of the panel lights.

The rest of the electronics will be shown later. Again, nothing spectacular. I'm not into high end audio, at least not the electronics part of it. There's a Mitsubishi® 3-head casette deck and FM tuner; Teac® 10 inch reel to reel, McIntosh® C26® preamp; Kyocera® CD player; Adcom® switching controller and a McIntosh® MA-5100® integrated amp for the rear channels. Also, I almost forgot, there's a Denon® DP-60L direct drive turntable and of course, the electronic crossover, a Furman® TX-424®; 3 way stereo, 4 or 5 way mono.

The square cabinet on the left is one of two nostalgic designs dating to the fifties and sixties, called a sweet sixteen.  The other, yet to be built will have sixteen 6 inch drivers.  It will be built as two separate cabinets as each driver requires about 0.4 cubic feet, requiring 3.2 cubic feet for 8 units.  The low end will be good to about 45 hz., more than adequate for doo wop.

In the interest of page simplicity, I've decided to put the room acoustics details on another page. The original intent was to place it here but this page is cluttered enough. The link is provided below.



The Corner Horns

Room Acoustics

Loudspeaker Main Page


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