- there will be three Moroccan rugs. 🙂
- I use Doug Sax’s Mastering Lab crossovers. http://www.rintelen.ch/download/604xover_SP.pdf I had Jon Specter replace all the caps with Jensen audio grade caps
- as for the current enclosures, they ARE custom DIY enclosures, built to Altec specs of the 1960s. https://www.hifiengine.com/manual_library/altec-lansing/620a.shtml I think there is room for improvement, but I don’t (yet) know the first thing about it, engineering-wise.
- Altec claims that the 604C and D go down to 30HZ
- As for the Velodyne UHL15, it seems to crossover at 85HZ, see https://www.stereophile.com/content/velodyne-uld-18-amp-uld-15-subwoofers-specifications and https://www.manualslib.com/manual/533050/Velodyne-Uld-15.html?page=10#manual I don’t know that it can be adjusted to 100.
- T-S parameters?
- I had Lafayette speakers to go with the Dyna. I couldn’t afford AR speakers.
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see what J Frum says here:
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- #14
Y’all need to get religion with regard to enclosure simulation. With T/S parameters, modeling a basic bass-reflex cabinet is easy and accurate. It’s a brave new world.
You’ll learn all about the delicate balancing act between the driver’s electromechanical properties, enclosure volume, and tuning. It’s a lot more complicated than “bigger = better”, and you’ll see the effect changes have on frequency response, power handling, and group delay.
I’ve modeled the 604-8G every which-way, and I can’t come up with anything that’s better overall than a 9 cu. ft. cabinet tuned to about 40 Hz. - essentially, a 620.
I’ve said it before, and I’ll say it again: It’s almost like those Altec engineers knew what they were doing.