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In Reply to: not this one ! posted by coresta on February 1, 2007 at 01:17:38:
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.
Follow Ups:
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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