I do not know but I surmise the JBL to be better cause its structure magnet. But here it is almost the double of the price here in EC.
Though your challenge is the linearity needed because of relative high XO for the 15" and the Audax. But 600 hz is still doable for such 15" drivers and it doesn't arm in my relative subjective preference book to have recess spl around that frequency. But precision of soundstage (think off axis behavior of the overlap of the two drivers) may suffer if the 15 " is not flat enough there. Theory.
What is the load you have in your box though ? The Pr400 works fine as low as 80 liters vented. Sure the Audax is a geme anf do needs carefull partners . Maybe the Faital could be better in the highs of the XO area.
Jbl are easy to refurb 😉 So perhaps is worthing the bucks you try or to keep on your shelves for latet designs. You know...our stupid hobby 🙂
Though your challenge is the linearity needed because of relative high XO for the 15" and the Audax. But 600 hz is still doable for such 15" drivers and it doesn't arm in my relative subjective preference book to have recess spl around that frequency. But precision of soundstage (think off axis behavior of the overlap of the two drivers) may suffer if the 15 " is not flat enough there. Theory.
What is the load you have in your box though ? The Pr400 works fine as low as 80 liters vented. Sure the Audax is a geme anf do needs carefull partners . Maybe the Faital could be better in the highs of the XO area.
Jbl are easy to refurb 😉 So perhaps is worthing the bucks you try or to keep on your shelves for latet designs. You know...our stupid hobby 🙂
I can find a pair locally for around 500$ used all day long it seems. 2226h seem a decent option for my budget.
my audax pr170mo is crossed around 300hz, first order no less 🙂. its a series crossover design, first order 300hz and 1.7khz. impedance is about 6ohm over 600hz, 95db efficiency speaker!
acoustically, a first order xo on the audax gives a third order highpass. Its been reported the audax 170mo can be played without any filter. i wouldnt be surprised at all once you work with the driver
wow it is low xo for this driver and butterworth first slope... do not pump up the volume too much...
it is low, but honestly even when i used the audax 170mo in a active setup, i personally thought it sounded better when I let it play down to circa 325hz rather then the more "correct" 500hz theoritical value.
Ive noticed the way the cone moves on the pr170mo even without filter is really obvious and unique. the cone is restricted of movement by the spider design of the audax. it seems to protect it from moving at all. therefore i suspect the xmax value while small is super hard to attain. id recommend to anyone the audax with a xo around 350hz (which is I think my xo point actually if i look at my measurements)
seems to work perfectly. the mids are to die for 🙂
that's interresting, cause it is meaning that its Aerogel brother could be used lower as well in a non pro environment, aka home spl level....perhaps ?!
never worked with it!
ive read comments from serious people that the aerogel audax is slightly inferior then the 170mo.
audax is a professional companie, therefore their specs are intended for PA situations. their XMAX is probably for 120 DB applications?
im sure the aerogel could go lower as well indeed for domestic context.
even at 100db, playing techno, my audax pr170mo is not moving at all. and i wont ever use more then 100db 🙂
imo sup in the highs and less good in the lows is the PR17 aerogel, but as well its frequency range is littlier... so not the same filter may works for both...
There is something with aerogel in the high mids to the treble : sounds really accurate to me. YMMV. (it is not so good in the upper bass low mid imho).
Edit : T. Loesh liked the ref you have... but all is about the Xo designer talent as always ! Caps if passive are very important for me !
Edit 2 : for Audax the theorical value for the 17PRM0 is 600 hz third order slope. (PA audio use)
There is something with aerogel in the high mids to the treble : sounds really accurate to me. YMMV. (it is not so good in the upper bass low mid imho).
Edit : T. Loesh liked the ref you have... but all is about the Xo designer talent as always ! Caps if passive are very important for me !
Edit 2 : for Audax the theorical value for the 17PRM0 is 600 hz third order slope. (PA audio use)
The Pr17omo and the little brother
https://en.toutlehautparleur.com/br...er-audax-pr17hr37rsm2ca7-8-ohm-7-48-inch.html
I have used and heard A lot since the early 90's. They can be crossed lower than 350Hz for sure with 6db. I know one guy who cut them about 200hz / 6db and played insanely loud with them together with a big old NAD amp and they never sounded bad or broke down. It just sounded very very loud and clean.
Not often ive heard such as clean open mid even to date..he used them up to 4.5khx with Beyma CP16 while his father had the PR170mo with the CP21 Alnico and some Revox amp and that was also quite wild but i always preffered the sound from the smaller brother... They're quite smilar. intead of 100db on paper sens its 96db. ALU former instead of kapton makes them little nicer on the top end and coil little smaller 37 instead of 40mm.
I have now for many years been using PHL 1120, 1130 and 2520 and recently bought some Audax again from Link above and its gonna be fun to compare, i kinda miss that mid... the PHL was very good but seem to have less "sparkle" than the PHL. Maybe just less distorsion? =) Anyhow the PHL suppose to be an improved Audax PR17 from same guy who designed them in first place but i think they changed a few things to make them more reliable and that can affect soundquality aswell..thinking on rubberfoam instead of coated foam etc (same on Focals tweetrs)... sometimes i feel the newer driver it is the more boring it sounds.
I haven't heard the aerogel version yet but i think its not as good.
Commerical speakers that used the above mid was for example Snakespeakers REF 1 (huge monitor with dual RCF L15AK200 and Dynaudio Esotar tweeters) located in now infamous studio CHEIRON aka MAX MARTINS/Denniz POPs old studio in Stockholm) and Von Schweikert VR4 from around 2010 (newer modell) -They also in update offered it with nextel coating)
My HIFI journey started hearing the best sound ever still today and that was on AUDAX PR17. one funny thing is that i had a brake with this Audax driver for about 7-10 years and had lots of other speakers in between, Magnepans, Focal Utopias, you name it. i had it... and one day i barrowed my old speakers back from a friend who bought them and it put a big grin on my face, what a mid! what a feeling, i must've shed a tear and my fot was tapping like crazy and i thought "this is to die for"... (this speaker was made cheaply with some China 12" woofers and an old FOSTER7Fostex phenloic horntweeter) BUT dang it sounded so good. Everything i wanted so i bought them back.. but then sourround rottened and Audax had stopped producing them so stripped them... 3 yrs later i was back again when Audax old supplier A.C.C of France decided to start production again Thanks ACC! just wished you painted magnets black also like old Audax units =)
https://en.toutlehautparleur.com/br...er-audax-pr17hr37rsm2ca7-8-ohm-7-48-inch.html
I have used and heard A lot since the early 90's. They can be crossed lower than 350Hz for sure with 6db. I know one guy who cut them about 200hz / 6db and played insanely loud with them together with a big old NAD amp and they never sounded bad or broke down. It just sounded very very loud and clean.
Not often ive heard such as clean open mid even to date..he used them up to 4.5khx with Beyma CP16 while his father had the PR170mo with the CP21 Alnico and some Revox amp and that was also quite wild but i always preffered the sound from the smaller brother... They're quite smilar. intead of 100db on paper sens its 96db. ALU former instead of kapton makes them little nicer on the top end and coil little smaller 37 instead of 40mm.
I have now for many years been using PHL 1120, 1130 and 2520 and recently bought some Audax again from Link above and its gonna be fun to compare, i kinda miss that mid... the PHL was very good but seem to have less "sparkle" than the PHL. Maybe just less distorsion? =) Anyhow the PHL suppose to be an improved Audax PR17 from same guy who designed them in first place but i think they changed a few things to make them more reliable and that can affect soundquality aswell..thinking on rubberfoam instead of coated foam etc (same on Focals tweetrs)... sometimes i feel the newer driver it is the more boring it sounds.
I haven't heard the aerogel version yet but i think its not as good.
Commerical speakers that used the above mid was for example Snakespeakers REF 1 (huge monitor with dual RCF L15AK200 and Dynaudio Esotar tweeters) located in now infamous studio CHEIRON aka MAX MARTINS/Denniz POPs old studio in Stockholm) and Von Schweikert VR4 from around 2010 (newer modell) -They also in update offered it with nextel coating)
My HIFI journey started hearing the best sound ever still today and that was on AUDAX PR17. one funny thing is that i had a brake with this Audax driver for about 7-10 years and had lots of other speakers in between, Magnepans, Focal Utopias, you name it. i had it... and one day i barrowed my old speakers back from a friend who bought them and it put a big grin on my face, what a mid! what a feeling, i must've shed a tear and my fot was tapping like crazy and i thought "this is to die for"... (this speaker was made cheaply with some China 12" woofers and an old FOSTER7Fostex phenloic horntweeter) BUT dang it sounded so good. Everything i wanted so i bought them back.. but then sourround rottened and Audax had stopped producing them so stripped them... 3 yrs later i was back again when Audax old supplier A.C.C of France decided to start production again Thanks ACC! just wished you painted magnets black also like old Audax units =)
Last edited: