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Speaker Design Help! Difraction Compensation

Firstly my email address in navin@vsnl.com. Since I do not have regular net address I would appreciate it if you guys could email me if you can help with my problem.

1. I am building a Home Theater System out of some older speakers. The speakers are:

a. 4 12" Audio Concpets DV12 woofers
b. 4 Scan Speak 8546 6" midbass
c. 2 Scan Speak 9900 tweeters
d. 2 8" Eminence woofers
e. 2 6" Audax HM170Z0 midranges
f. 2 Morel MDT33 tweeters

Front Channel will look like a NHT 3.3 / 2.5 with a side firing 12" and a Scan Speak 6" 2 way on the front baffle. Each channel will be 1 12", 1 6" and 1 tweeter.

Rear Channel would be a 3 way using Eminence, Audax and Morel drivers.

Center would use 2 remaining Scan Speaks and hopfully a spare MDT33 or 9900 tweeter that I will still have to obtain

Sub will be 2 remaining 12" in a 6 cu. ft sealed box (6 feet wide x 2.5 feet high x 6" deep).

Questions:
1.
I would like to use the 12" side firing woofer as difraction compensation for the 6" 2 way in the front channel. Is this possible? If so then the 12" would be have a Low pass around 200-300 Hz but does one not need a High pass crossover at 50-80Hz for the 6" so is not overloaded with low frequencies?

2.
Since the 6" in the front channel has only 3 edges (the fourth edge is not there since it is on a tower cabinet). The 2 side edges (of a 8" wide cabinet) and the top edge above the tweeter. How much difraction compensation is required for this? 4db? 6db? 8db? difraction compesation is a high frequency filter that starts around 100Hz and ends at about 1800Hz for a 20cm wide (8" wide) cabinet.

Regards
Navin


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Topic - Speaker Design Help! Difraction Compensation - Navin 23:23:49 01/01/02 (0)


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