And Now For Something REALLY BIG

[RockLeeEV]

I think passive crossovers sound a bit more natural than active, but that just my taste. I ran my system active for a long time.

Why do you think this would be the case?

series DCR raising Q at system resonance?

 

[buzzforb]

Bi radial vs iwata vs jmlc. Any opinions?

 

[tinitus]

I will begetting the hf144 or 204. Both push resonant impedance down low and will give the option of crossing low or high,depending on what you want handle vocal range.

yes, tempting isnt it
but not so easy at all
for one, bigger drivers are usually built for higher power handling, and less aimed lower frequency
for hifi you dont need the huge powerhandling, and thus its possible to cross lower
but dont forget you need a much bigger waveguide
and its getting a lot more expencive

another problem could the transition to a big woofer
two drivers with totally different sound character
cannot be easy I guess
is it worth it ? I dont know, maybe it is
but surely, just crossing low is not all there is to it

 

[buzzforb]

Mating issues are there regardless. Only get better by crssing to 6-8" mid. None of those go far and niw you have multiple xo points. Ill try two way and go from there. So many people prefer bigger throat sound over 1"

 

[tinitus]

So many people prefer bigger throat sound over 1"

how low do you expect to cross it ?
only interested, not argueing

 

[JRKO]

looking at the freq. response for the HF144 I'd guess you could cross at 600-700hz as long as you dont bash it too hard - its still producing 105db/w/m for 1w at 500hz so you'd barely need to tickle it to damage your hearing

 

[buzzforb]

If I go Iwata, I may try 500-600. Cant tell until it begins. found a couple interesting sites i case you are interested.

Are Iwata horns that good?
Yuichi's Audio Lab.
L'ébéniste audiophile
Iwata horn - Audio Voice Acoustics

Second one is the most interesting with more explanations. I really like the finned versions. I could pull this off as I am a bit of a woodwroker, but i still have interest inthe LeCleach versions as well.

 

[tinitus]

looking at the freq. response for the HF144........

nice looking driver, but response seems a bit bumpy
but maybe thats normal, i dont know
also most of the big waveguides appear to have a bit rough upper frequency
I wouldnt mind trying it myself tho
too risky for me, but if it sound like the HF100, Im in

found a couple interesting sites i case you are interested.

wow, thats cool
I didnt know my own waveguide was a Iwata profile
or at least a 'look alike'
no wonder it sounds so good

 

[Pano]

Why do you think this would be the case?
series DCR raising Q at system resonance?

Q could be part of it, of course. I really don't know "why", it just a subjective impression that I've gotten on a lot of different systems. Active can sound a bit hyper-realistic to me. So detailed it sounds better than real. Like peering at the music thru a microscope. Very impressive, to be sure, but a good passive crossovers seem more organic, more natural to my ears. That sounds like pure woo-woo, I know - but that's how I hear it!

(Active subs are a different matter).

 

[JRKO]

if it sound like the HF100, Im in

Where do you cross the HF100 in? They say it should be 2Khz but it dips nicely to 1khz at 100db/w/m - do you think you could use that to mate nicely with the 15FH100 at 1khz?

 

[buzzforb]

If i go with 1", it will be 10hk or rk as they go lower. Have to watch resonant frequwncies

 

[tinitus]

my HF100 is the old one
from memory its more like the HF102, a bit round and rolled off
the new revised model should be able to go lower
but maybe the low ressonance peak is lowest possible xo point
but I dont know

hmm, right now its a 6.8uf cap looking into 15ohm series resitor, then some inductors and resitors in paralel, and a very small series inductor looking into a small resistor
its probably not crossed very low, maybe just below 2khz, like maybe 1.7khz, but I really dont know

that said, I did put a lot of work into making the throat transistion smooth as possible
CD exit angle ? I dont see there could be much to do about it

 

[buzzforb]

I just want to hear the polymer diaphram. It sounds like it has the potential to maintain clarity, but be smoother like BE diaphram is said to do.

 

[Pano]

I doubt this is a driver you'd want to cross at 1K. It might "work", but would it sound good? I don't think it would.

 

[buzzforb]

Pano, what about the hf 144? This was what i was leaning to.

 

[ingvar ahlberg]

I prefer to x-over a bit higher, think it sounds better when the lf unit covers the fundamentals in voices, but that´s just an opinion.

If You can accept 1.7kHz or up a bit then the STH tractrix horn is really nice, very well built and cheap.

 

[buzzforb]

Is that the 104?

 

[ingvar ahlberg]

No, it´s the old version of HF100.

This is the 104

 

[JRKO]

HAHAHAHAHA!! The local rep for Auto-Tech is a 20 min drive from me. Am trying to arrange demo. Will take pix if allowed and feedback next week

 

[JRKO]

Seeing him monday!

heres some pix I found to wet the appetite

To me the first pic of the E-JMLC-300 looks like a triffid that might swallow you whole if you talk while its playing! Im liking the JMLC-400.........