Stuart Polansky wrote:
Very nice Hal.
A question about your subwoofer to OB crossover point. In general, doesn't one keep subs to under 80Hz or so? Can the H-frame baffle subs perform well above this? [Maybe because of the servo, they sound good enough to use to a couple hundred Hz? Doesn't the Neo10 lose usable output below about 250Hz?
On paper, it would seem that there is an issue. How did that work out.
BTW, I'm very interested in your crossover and measurement knowledge, if you're willing to share it.
REW and a Dayton calibrated USB mike are in my tool bag, but not much in the way of experience....
Stuart
Stuart,
The subs are with the main drivers, so no problem running them up higher in frequency to crossover to the NEO10. The servo subs go up pretty high at -6dB to crossover to the NEO10 without any issue. There is no localization issue with the subs and mains being separated. I do time align the subs to the main baffle with the digital crossover.
Since you are working with line array's, the measurement process has to be modified to take into account the line array length. The farfield measurement distance should not be closer than the vertical length of the array. REW use to offer gated time measurements to do the individual measurements needed to design the crossover. You need frequency response measurements for each of the driver arrays and the subs individually to design the crossover. Also only measure one channel at a time.
Be careful to start with the volume low for the measurements as to not blow drivers by mistake. I have to be very careful since the BG drivers are no longer produced and hard to get spares.
The drivers response is heavily influenced by the baffle design, so the response plots on the drivers from the mfg are just a starting point.
If you do speaker measurements, I am sure folks will post insights into the crossover design needed.