Hi Ian, thanks for your comments.
If by "time correction," you mean delay, there isn't any applied, according to JBL's "Settings" document for the DMS-1, concerning which see the earlier discussion on this forum:
http://www.audioheritage.org/vbullet...ings-for-DMS-1
My plan is to first of all reproduce as exactly as I can what JBL did. After that, listen, measure, and decide further. . .
1. Components: 4 x 1400Nd woofers, 2 x 2450SL-A drivers, 2 x 2332 horns — I'm using the 2450SL hoping the difference is minimal
2. Cabinet dimensions and tuning — I've only got external measurements, so if anyone can supply internal and port dimensions, much appreciated!
3. Crossover according to the "DSC 280 Recommended Array Settings DMS-1" document:
LF: LR12 high pass @ 18 Hz, LR24 low pass @ 1 kHz; HF: LR24 high pass @ 1 kHz, low pass, out.
Gain Settings: LF 0 dB, HF –13 dB
I'll be using a dbx DriveRack 4820, arguably a much better processor than the DSC 280, but of course the settings won't necessarily "translate" perfectly. But, again, that's the starting point.
4. EQ: According to same document, only four EQ settings:
4.1. +6 dB @ 183 Hz with a "bandwidth in octaves" of "12 Lo" — not sure what "12 Lo" means here
4.2. –1.5 dB @ 378 Hz with a bandwidth in octaves of 0.25
4.3. +10 dB @ 8.28 kHz with a bandwidth in octaves of "12 Hi" — as with "12 Lo," not clear on this specification
4.4. –1.5 dB @ 3.24 kHz with a bandwidth in octaves of 0.25