Originally Posted by Altec Best
The 1005 is a longer/larger horn, so should be a good match to dual 416s once EQ'd.
In theory you want the system's response to be ruler flat from at least 20-20 kHz (or whatever the system's source available low/high F10 BW is) throughout the listening area which of course is extremely hard to do even in an acoustically ideal room and if max efficiency/SQ is required, then all the speaker system's (drivers+XOs) efficiencies must be matched in the sense that they can attain the desired dynamic headroom at low distortion at max desired average SPL.
From this we see that to do a proper system design requires knowing the room's acoustics and the max BW/dynamic headroom of the source(s), otherwise you design for the max your budget can afford in components, gross bulk and then EQ it to be as flat as practical over a fairly narrow 'sweet spot'.
FWIW, the acoustic power structure of the *recorded* music I've measured using a 1/3rd octave RTA's peak hold feature, max dynamic headroom is required in the ~250-500 Hz BW (+30 dB, clipped!) for a few symphony CDs and ~32-96 Hz (up to +32 dB!) for a couple of pipe organ CDs. The rest peak out at +24 dB in the ~40-1 kHz BW. I apparently no longer have the various individual source's data, so if you only listen to FM radio and/or pre-mid '70s vinyl and/or 78 rpm LPs, designing to any of these would seem overkill by the vast majority, though I just view it as that much lower a distortion level.
WRT XO or any other aspect of an audio system's design, the more powerful the software and measuring system, the less time required to dial it in to a target response once you've enough experience with them. Me, I didn't even have a RTA until well after my peak building years, so am strictly 'old school'/'dinosaur' for the most part.
Anyway, based solely on my limited measurements and using a worst case scenario, either the room's acoustic gain and desired F10 or how much EQ is required to flatten the T350 out to 20 kHz or its desired F10 will set system sensitivity, so don't have a clue how closely matched the components ideally need to be.
That, or a good 'ear' for matching tonal balance to within +/-3 dB over at least the ~40-15 kHz BW.
GM
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