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In Reply to: Re: Altec 825/825 cabinet improvement posted by Tom Brennan on January 31, 2007 at 19:27:19:
as you detune the cubic volume of the load of the woofer ...
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Greets!Which one can argue is way too much for optimum tuning with all but the original 803 driver and the high output impedance amp used to drive it.
Image above 4pi space.Hi GM
If you were to build a 2way Altec VOT inspired loudspeaker,with ~150hz front horn,would you use one with very low Qts,and a rising response FR on the 15"?-Looking for that 'Ben Hur cinema impact' some talk of here.
My guesstimation is that the horn will fill in the 150hz-800hz area.Not sure how the final response will be flattish though!
Mike.e
There are three constants in life: death, taxes, and the inevitability of a (speaker)wire thread being closed -SY
Greets!Well, typically the large Altec dual 515 80 Hz horns were used with the appropriate multi-cells XO'd at 500 Hz, so I guess my question is just how 'real' can your budget/floor space afford? Really, most folks are satisfied with M19 style speakers or at most, A7s, though some step up to A5s and a very few some variation of the original systems like I had once upon a time. Nowadays I find the dual 515Bs in large corner loaded EBS MLTL cabs with 511s on top suffice since I no longer sit far enough away to justify the large horns/separate LF system. Regardless, in each case a very low Fs, Qts wide BW 15" was used, so yes, this is what I recommend. FWIW mine measure ~20 Hz/0.2 Qts.
WRT getting a flat response, the objective is to design the horn so that it rolls off up high at a rate to ~blend with the driver's rising response/break-up peaking and why the Altec horns have such large throats/short pathlengths.
Hi GMOn second thoughts,the M19 looks gargantuan compared to modern 2" ipod speakers,it will do I think!
The 18sound drivers look good anyway,a few nice Qt 0.2 driver with flux shorting rings and decent FR.
Now,trying to see how much 90 x 50 PT waveguides are ,after reading audioheritage quick and dirty 4430s! EV HR9040s or other horns id like to get just arent available new.
Mike.e
There are three constants in life: death, taxes, and the inevitability of a (speaker)wire thread being closed -SY
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