Hi all,

Long time listener, first time caller.

I've recently decided I would like to try my hand at a vintage Altec/JBL hybrid system and have slowly been acquiring drivers and other assorted relevant equipment.

My initial plan was to follow the Jean Hiraga Onken cabinet plans and I am still leaning in that direction although I've also been giving some consideration to the Altec 620 cabinet.

My room is 12' x 16' with 8' ceilings and my current driver compliment for the project is as follows:

Altec 416-8B woofers
JBL 2446h Compression Drivers
JBL 2380 Bi-Radial horn
JBL 2405h slot/super tweeters
Belden 9497 cables
Werner Jagusch Crossovers

I would like to build the cabinets to house the 416-8Bs while being able to mount the horns and super tweeters on a separate, removable plywood sled up top and am wondering about a decent, workable crossover frequency for the 416s? I've read everything from 500-800hz and have also read that they start to degrade in output quality after 1k. Does anyone here have experience with these that could speak to this subject?

The Werner Jagusch crossovers were purchased locally here in Vancouver from someone who was selling 16 Ohm Valencias and they are the older version that does not allow for the super tweeter (at least not as far as I can tell). I've reached out to Werner who says they can be run at 8 Ohm which is a relief as all of my drivers are 8 Ohm. As far as the super tweeters go, I am hoping to use an inline capacitor although I'm not sure of the value yet and want to experiment with just a 2 way first.

This is my first DIY speaker build project and I currently own Electro Voice Interface Deltas which I will be hanging onto in case this build does not end up being to my liking. I have a Mac laptop so currently can't use WinISD.

Any info regarding crossover frequencies would be greatly appreciated.

Thanks in advance.

Current System:
Pioneer M22 Power Amplifier
Pioneer C27 Preamplifier
Electrovoice Interface Deltas
Wiim Mini Streamer
Cambridge Azur DAC Magic
Technics 1200M3D
Pickering 625DJ Cartridges
Cardas 4S11 Speaker Cables