Crossover Help Needed With ANOTHER Pair of ALTECS

[Alien_Shore]

Hi Earl,

I'm also looking for a similar plot for the Model 14s 36633 woofer, if you happen to know where I might locate one?

Kind regards,

Sam

I created a M14 thread back in the day when I landed my pair. There are some (very) amateur measurements in there made by me.
Looks like most of the pics that I hosted on photobucket are broken links now. Lemme see if I can put a couple of the ones of interest onto Flikr...

[sam08861]

Many thanks EarlK!

- - - Updated - - -

Thank you, Alien_Shore!

I've been bi-amping these 'audiophile nirvana' style with the same dbx PA2 DSP crossover & microphone in their article and have been playing with 6, 12 and 24db butterworth and LR slopes.

Rather than using the device's auto EQ's (which is impressive) many suggested filters, I found that if I attenuate the horn 8db, LR 4th order crossover at 1.5Khz (stock xo point) I get a good cross and then just 3 filters: 1: a +5db high shelf to 217khz for baffle step correction for the low end, 2:a 3.5k suckout to flatten a hump the mids + 3: a lift on the high end at 10k, I got a pretty pleasing sound via DSP. (apologies for the large image, I've not yet figured out how to resize). The image below is the room measurement at the seating position using the DSPs condenser measurement mic.



The Auto EQ's many filters (#d items) and flat target response for comparison...


I've since switched to to xkitz 24db 3 way balanced crossovers (to incorporate a sub) but have since taken the subs out and crossed the 3 way at 1.5khz and 25khz to make them a 2 way and an external EQ for the shelf/suckout. When Eq'd properly, I found I preferred the sound of the Altec woofers over the mono sub. I tried crosses at 40, 60, 80 and 100hz.

Just ordered Nelson pass 6-24 crossover board ($33) and full range EQ ($10) pcbs to to see how close I can get with those and perhaps eliminate the EQ in my system and get everything for the crossover in one box again. (& analog!)