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75.109.11.25
In Reply to: RE: Stock Fostex BLH vs RCA-fan BLH posted by RCA-fan on August 13, 2007 at 15:50:17
your horn is better
there seems to be banter that 208 horn is "better" than their 206 horn
your graph of 208 in RCA-Fan BLH vs 2226 type in hitbox half-horn looks like the halfhorn trace is too high - sims with 206E for K-slot vs M151 for hitbox say K-slot is stronger sensitivity wise around cutoff
I've got Nirvana 10 coming and need enclosure- - hit-reflex? can't imagine 500+ liters airpace horn for weak drivers (?)
best.
Freddy
Follow Ups:
I have been experimenting with four accepted open baffles alterately stuffed with my 15 pairs of full/wide range 8" drivers, backed by either subwoofers or on board powered 15" woofers. I also have several front and back horns for listening to these drivers. I have become a convert to open baffle through this process and can speak to the fact that the Nirvana drivers are remarkable in this application. I am currently evaluating a pair of cast Super 8 Nirvanas in one of my open baffles with stunning results. I'm not saying that I believe that single full range drivers, augmented in the bass, is the best of the best, but, I am a big fan of maximum results through simplicity. Even though I am a big fan of multi driver compression horn based systems, I love the coherence and simplicity of open baffle.
Here are outdoor curves of the "hit horn" outdoors vs other horns.
It is loud. Sims are simulations. not perfect.
cool Bill - I've gotta see which of my woofers might get about that much hit - is that more hit than your simulations predicted?why is there an apparent rise with the hitbox around 1K?
was there any more half-horn activity?
Freddy
simulation 206E in RCA Fan K-slot BLH vs M151 in RCA Fan hithorn w. M151
There is no activity past 200Hz, because the level is much higher between 50Hz-150Hz than the midband response of the woofer past 200Hz, due to the horn.
Same for the C-40 backloaded horn. You just get a lot of gain with these type boxes.
The box is doing all the work. What ever woofer you use will have similar bass, just less midrange as the cone gets heavier
guess question might come down to which potentially plays "nicer" - 8" wideband in RCA-Fan BLH or good 15" coaxial in RCA-Fan Hawaii V-vent (or hitbox)? - ?flip of coin?
I supsect theres a market (maybe very small?) for flat-pack BLH for 8" - Madisound only offers BK16 and Planet 10 made its flat-pack debut with the little Frugal-Horn
The Hit horn is about as loud as you can get it without a true horn. The power output far outstrips an 8" BLH.. at the expense of flat response.
If you like kick drums, floor toms, or conga drums-- a hit horn is for you. I put a lit "hit" from 90-150Hz in the RCA-fan horn, just for this reason.
There is a market for a 8" BLH. That is one of the reasons so much time was put into the RCA-fan horn. I was curious as to how good you could get a BLH with an 8", in a small box.
But, I decided I did not want to be in the woodworking business, and
after the design was fixed, I posted it here on A.A.
Partly good will, partly advertising.
Bill
hi Bill -
I love hit-types for drum and if my precise-cutter ever cuts then your hitbox is coming up.
your K-slot BLH has strength in that graph where its needed vs Fostex's 208 BLH plus 5 internal panels all the same width is pretty simple - do you think it would play big drum with Fostx at good level? (i play that with 150W/channel tube on Klipshorn - k-Horn not very coherent but can startle despite some k-horn mudiness)
Karlson may still win on Ken Griffin (?)
Freddy
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