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In Reply to: Re: Anyone know dimensions for Olson rear horn rectangular enclosures? RCA-Fan too posted by freddyi on January 29, 2007 at 15:49:22:
I have the 15'' Paudio coax's, 15BMCXA. In an earlier psot, Paul felt that the Olsen back loaded horn would work for this epaekr, hence my query on the dimensions of the box.
Ypur thoughts on that?
Many thanx
john
Follow Ups:
I'd trust Paul's guesses (lets see if he catches this thread) - IIRC he modified throat and extended path and rear horn's mouth (an dcabinet depth) plus added a front horn to David B. Weems' basic "Mellow Monster"have you measured CXA's parameters? - Qts is quoted nice and low.
how's CXA's tonal balance and qualities in reflex (or on baffle)? -
-might try CXA or SN15C in Karlson or V-vent box (and have old Eminence 95oz magnet C15CX with 3"x6" horn) SN15C's Q and mass look a bit high for K15 due to 3" coil but if SN15C are tonally lively then may be ok (?) = pig N poke
I have the Paudio in an OB arrangement. JE labs design. extremely happy with the imaging and mid range. However bass is lacking, not tight. top end harsh. I put a post a few weeks back asking about compund horn enclosures, and basically from the advice there, it appeared a rear horn loaded enclosure would be more suitable.
I have so far added a passive 2nd order XO at 1250hz. This has improved the bass quite a lot. I must note that i have supplemented the bass with ahome theatre subbie (not great, loose, but it helps). The mid range is still good. the top end is too harsh. i padded down with an l pad -6dB for top end/tweeter on the driver, and this has helped too.
I think long term, a ribbon or the like tweeter above 10Khz will be needed for this driver.
For long term happiness, i have hence looked at horn enclosures. Paul suggetsed Olson's enclosure, hence my search for this. Under his recommendation and pointers, i looked up the patent, and downloaded drawings. No dimensions however.
I bought a citation of the paper he did with ? Massa in the American Acoustical Soiciety, i think 1936, but the box/horn design is different.
Also, can someone tell me how I can copy a pic onto the body of the letter? that would help to show what i have.
Many thanks
John
(word processor or insert image on another image?)could "half-horn" have any advantage over regular bass-reflex? I believe RCA-Fan looked at a few half-horn for D130 besides the "Hawaii" V-vent. IF CXA Qts is really that low, then 15CXA might work for a box designed for D130.
a Karlson would have mild gain from ~55-200Hz over a reflex, low cone excursion but one may or may not like Karlson artifacts.
(one person's wife did not like the look of V-vent - maybe WAF can be tricky)
Seleninum ST324 slot tweeter might be good for a "helper"
Eminence C15CX in RCA-Fan V-vent box
C15CX impedance in RCA-Fan's V-vent enclosure
one builder's adjustable gap V-vent variant
D130 parameters from listing at Lansing HeritageFs = 40 / Qts = 0.25 / Qms = 4 / Qes = 0.27 / Vas = 297.3 / Eff = 6.7 / Pe = 75 / Xmax = 0.76 / Re = 6.3 / Le = 0.6 / Sd = 0.09 / BL = 18 / Mms = 60 / Flux = 1.2
P-Audio 15CXA listing
BM-15CXA
Description COAXIAL TRANSDUCER
Size (in.) 15.0
Power RMS (Watts) 250
Fs (Hz) 39.0
Xmax (mm) 2.75
Sensitivity 1w/1m (dB) 101
Qts 0.24
Vas (lt) 257.5
Magnet Material Ferrite
Thanx Freddy
The Paudio I have is the BM-15CX38. i am sorry if I have given wrong info. The manufacturers info is:
Fs 36Hz
Qes 0.23
Qts 0.22
Vas 287Lt
Xmax 4.5mm
These alter any of your findings?
Many thanx
John
Hi John - might be even closer to D130's factory specifications.RCA-Fan suggested one half-horn arrangement for D130 but its not been built. I'm not sure if Bill is fond of most coaxial. You might write him a few brief questions from Acoustichorn's website under " Contact "). Coax are an ok tradeoff for me.
AH Pages
Thanx
i emailed him about a month back, and he felt that the sepaker would do well in an Olsen horn enclosure, hence my search for this enclosure now. In the "Horn News April 2006", there is an article on it. I Presume you have seen/already know of it anyway. There is a corner horn enclosure there.
many thanks for your help'
best wishes
john
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