Hi All.
Earl K made this Valencia with a 411 and a 288 driver and an 511 horn.
I like the looks. BEEFY LOOK
Nope !Originally Posted by LICORNE
Hi All.
Earl K made this Valencia with a 411 and a 288 driver and an 511 horn.
I like the looks. BEEFY LOOK
That's not mine , but I certainly like the visual presentation quite a lot ( ie; "I wish it were mine" ) .
Thanks for the image ( it's a nice "beefy" look ) !
Me too, though it appears to be a 9846 box/woofer setup except with the 9848's horn, but the driver offset won't allow either's XO to work properly, so hopefully it's a hybrid also.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
So perhaps bi-amp and use an active crossover that does phase-alignment adjustments?
That would be my choice.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
I too am a firm believer in custom networks ( especially when components have been changed ) .
Let's keep in mind Licorne thought this box was mine ( & to boot, called it a custom-built Valencia ). I think the whole 288 driver ( swap thing ) is best treated as a theoretical exercise .
Having said that ( is the 511E horn swap a deal breaker for this class of network) ?
- A 288-8K on a 511E horn ( vs the 802D on a 511b ) doesn't miss duplicating the dimensional marks by all that much .
- In fact, the difference is around .75" ( with the 288-8K/511E combo coming up the "shorter" of the 2 combos ) .
- Here's bfish(s) work ( for a quick visual reference ) ;
- The 288-8K is @ 4" deep from exit to ( middle of ) top plate while the 802D is @ 2.5" .
- Cutting off say 2.5" from the 511b ( then adding back on a 1/4" deep mounting flange ) leaves one with a 2.25" ( shorter horn ) with 1.5" added back ( accounting for the 288s extra depth ) giving an approx. depth difference of just .75" ( less ) .
- At crossover ( & say it's exactly 500hz ) a quarter wavelength is @ 6.5" - 6.75" . So the .75" difference is well within what I'll call an allowable zone of additive quadrature ( all the while making some pretty broad assumptions, such as Altec having actually "nailed" the phasing of the original crossover ) .
- Assuming my early morning math hasn't failed me [ ( .75 / ( 1130 / 500 * 12 ) ) * 360 = 9.96 deg ] , that .75" represents about a 10deg difference ( in phase rotation ) compared to the original network.
- A 10deg difference ( compared to the original ) wouldn't hinder the goal of achieving proper summing ( within the crossover region ) .
- OTOH, the 288 & the 802 variants differ quite a bit in their sensitivities , their impedance curves ( from 400 to 2K ) as well as their frequency response curves .
- ( If this was my project ) I would proceed to modify the original HF leg of the network based on those factors . And since I really prefer bi-amped woofers ( with passively crossed HF driven by another amp ) the original network would be right out the window .
Hi All.
Earl K made this Valencia with a 411 and a 288 driver and an 511 horn.
I like the looks. BEEFY LOOK
Looks like a stock 9846 from the outside and it should answer the question
"Where's the beef?" quite soundly........I know mine does..........
9846216 | Flickr - Photo Sharing!
Hi All
The speakers pictured are mine - they are standard 9846As
They take up a lot of real estate in our lounge! but fit snugly in the corners on 200mm stands - essentially to get clean bass.
They are bi-amped with a Marchand crossover
I love'em.
Here's the link from the previous owner
Altec 9846
Wow--those are real beauties Art! Never seen them with wood grain like that....
http://altecpro.com/pdfs/vintage/Spe...r%20System.pdf
Being of "Sound" Mind
Thanks VOT. When they were new, they were sent to a cabinet maker for the stands
and finish to match the auditorium stage they were displayed on.............
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