|21st September 2019, 08:22 PM||#31|
Join Date: Jun 2019
Wow, thanks a bunch, i love the looks of that tube amp and that's a really great website link.
i'll have to look into boxsim; i didn't simulate it but i have made some measurements at both ends of the knob.
|22nd September 2019, 08:28 PM||#32|
Join Date: Aug 2008
Location: Portsmouth UK
The thing I take from these ancient woofers is that they were highly efficient and very lively and detailed. The definitely had some thing good about them...
Most folks think it was low mechanical loss, i.e. a high Qms:
The high efficiency bass is a bit of a problem with modern tweeters. They struggle to be loud enough. The Eminence Alpha-8A for instance, which is quite retro in some ways, comes in near 92dB. The Beta-8A is nearer 95dB.
ALPHA-8A - Loudspeakers | Eminence Speaker
These days, you look for horn loaded tweeters to match that, except for a couple of modern domes like the Audax TWO34 or one SB Acoustics dome that gets near 95dB. I used a less efficient old 90dB 8" Elac bass here ( modern equivalent is SEAS CA22RNX, IMO ) with a similarly retro Monacor HT-22 90dB cone tweeter:
More modern Crossover, of course, with lower distortion:
And the LR4 maths which drives the design, though the above is actually around 3kHz crossover:
A very good 2 way, IMO. A lot to like for a relaxing sound. You take the beating from the narrow dispersion, but good and much more mellow than dome tweeters, IMO. And very retro inspired.
Best Regards from Steve in Portsmouth, UK.
Last edited by system7; 22nd September 2019 at 08:38 PM.
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