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Multi-Way Conventional loudspeakers with crossovers

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Old 30th March 2004, 11:44 PM   #21
ScottG is offline ScottG  United States
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"SA8535 beats G1"

Sorry, no. It will most certainly with regard to SPL, but we are talking about domestic audio playback - not sound reinforcement. The thing that SA touts so highly, spectral decay, is substantially bettered by the G1 where its the most important - the midrange. Additionally this depends HIGHLY on the quality of the amplification (on wether you'll here a difference or not). There is a real "voodo" mix going on with an amplifier's dampening factor and true ribbons that you can't get with planars, (something to do with the suspension creating a MECHANICAL dampening factor for the planar I suspect).

Impact has a lot to do with driver eff. & forcefactor, and dampening factor of the amplifier (along with its current capability). The amp I mentioned has a very good dampening factor with high current - what it suffers from is ONLY headroom. I think you would find that if you substituted Bruce's amps in your system you wouldn't take them out.

For the PHL 10 inch, the 3450 - it has greater X-max and higher eff.. most certainly NOT the 3860 (which will have a curtailed bass response) As far as loading I mean OPEN BAFFLE, i.e. no enclosure - just a baffle to screw the drivers frame to. The size of the baffle will determine when dipole cancelation will occur - if its a very small baffle it will occur starting just below 400 Hz. This works though because you'll have your pair of woofers crossing over in conjuntion with the acoustic high-pass crossover created by the dipole cancelation (probably a 1st order low-pass on the woofer around 300 HZ considering baffle step loss - just a guestimate though).

still though, the more I think about it the more I like my most recent suggestion (the 2 Supravoxes in a T-line with the G1) (though not if you cranking the system past 105 db at 1 meter).
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Old 31st March 2004, 02:09 AM   #22
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Audiophile quality 'sound reinforcement' is my goal for home use.
While one SA driver per channel is plenty, I'm shooting higher and
planning to use four SA per channel (small line source). If I had more
funds, I would do eight per channel, but that is really a different
design that I have planned. Fun + punishment = Funishment[tm].
This isn't for normal people

:
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Old 31st March 2004, 03:50 AM   #23
ScottG is offline ScottG  United States
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Thats cool.. say you don't live in an apartment do you?
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Old 31st March 2004, 06:26 AM   #24
AR2 is offline AR2  United States
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What a beautiful tread. I always like reading Thylantir's posts, he is right on. Since I have my speakers almost in exact config. you are seeking, I would just stress that type of amp will define your sound. I use 2A3 Cary monoblocks for the Aurum Esg3 and it sounds perfect. I just have finished Gainclone amp (BrianGT group buy) and tried it on Aurums. Very revealing but certainly not harsh, completely different from my tubs. Having tube sound for a long time, I was surprised with so much highs coming out. The beauty is that ether way, tubes or good solid state, they sound great, relaxing and undistorted. Everything else is just a matter of taste.
I would also agree that with PHL 3450 great crossover point would be 2,2K. If you go higher there would be noticeable beaming in mid tones, and if you go lower you would be making your ribbon working very hard - easily damaged. When you hear PHLs, you will want them covering voices and piano, they are awesome at that.

The difference between 3450 and 3451 is 8 and 16 ohms impedance, otherwise they are the same.
I was very happy with e-Speakers, Andre is great. Very helpful and honest.
Good luck with your project
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Old 31st March 2004, 07:10 AM   #25
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Quote:
Originally posted by ScottG
Thats cool.. say you don't live in an apartment do you?


If volume knobs didn't exist then I would be in trouble.

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Old 31st March 2004, 07:18 AM   #26
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I connected a cheap portable CD player to the SA tweeters
for comedy reasons.

Headphone output --> SA tweeter.

no crossover.

I did get some sound out of the tweeter.

It's funny to drive a speaker with only a small signal preamp.

The drawback to high sensitivity drivers is they tend to 'amplify'
weaknesses in the electronic gear you use -- mainly noise.
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Old 31st March 2004, 09:33 AM   #27
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Thanks but I will be using my loudspeakers with more than 105db / 1m.
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Old 31st March 2004, 10:03 AM   #28
dhaen is offline dhaen  Europe
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Old 31st March 2004, 10:03 AM   #29
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Old 31st March 2004, 05:03 PM   #30
ScottG is offline ScottG  United States
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Conceptually the design would be something like this:

http://www.alonbyacarian.com/index2.htm

click on either lotus elite

with the ribbon centered obove the PHL mid;
the PHL mid open in the rear;
The 2 TAD drivers in a bass reflex enclosure below.

Say, with your thrist for SPL you might ask the guy your conscripting for the crossover to make a pair of Bruces T-8's for you from scratch (the design is in is audio reality book - as is his preamp.. use EL519's instead of EL509's)
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