no, the only thing you can do with it (beside crossovers!) is automatic time alignment (which is already quite useful!) with EMC8000 measurement mic. The DEQ2496 has measurement capabilities but a PC would be better.
If you buy that mic then you only need a mic preamp with phantom power and you can use any PC as a measurement device with something like HOLM impulse.
sorry I meant ECM8000 not EMC8000 :
http://www.behringer.com/EN/Products/ECM8000.aspx
If you want to do time alignement (delays on each driver to get them time-aligned at the crossover frequencies) you jsut need to plug it into the 'C' input of your DCX2496.
If you want to do real response measurement with this mic then this is more complexe, but you have two choices:
1- you buy a DEQ2496 and rely on its frequency response analyser (not very precise...)
2- you buy a usb sound card for your computer, with an integrated mic preamp and phatom power (the ECM8000 needs some power), and you install a free measurement sofware such as holm impulse. This is much more precise than a DEQ2496, but also much more complex...
yes you are right, level matching is much more important.
Also, if you go active and remove all passive parts, put a cap in serie with your 2404s to protect them in case of problem (bad parameters on DCX, amp problem, ...). Something around 15uF or 20uF should be good.
measurement with a PC is the best method, but with a simple SPL meter and some test signals (from a PC or a test CD) you can already do basic level adjustments.
You can plug your PC to your sound system and use WinISD to generate some test tones at different frequencies, and then you can use any SPL meter to check the resulting SPL trough your speakers.
First thing would be to connect all the drivers directly to amp (with a protection cap on the 2404), and dial the same crossover point as the original 4628 passive network in the DCX2496, with LR24 slopes as a start (800khz et 3khz I think?)
Then you plug you computer to the DCX2496 inpout, and try different test frequencies in the mid band of each driver (lets say 400Hz for the E145, 1.5khz for the 2118, and 6khz for the 2404), and you adjust your amplifiers to get the same SPL for each on the SPL meter (same position, lets say 2m from the speaker, at ear level).
When that is done you knwo your levels are ok and the system should sound similar to its passive version, and you can start tweaking...
yes you are right. At least all these frequencies are likely to be above the schroeder frequency in martin's room, so that should not be that bad, but larger band signals would definitely be safer.
Can you suggest a software that would easily generate these band noise signals?
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