Hi Christian
Where do you think that the 1/4wl cancelation-notch in the response of the midranges is?
Maybe your midranges "reflect" of at the end of the long/narrow initial slot, where the horn opens up drastically? And than the notch-frequency would not correspond to the 60 cm to the tweeter but to the end of the initial slot, which would be a lot shorter, meaning a higher cancelation-notch-frequency.
What do you think Christian and Mark. If this is the case, the HP6040 would work for a MEH.
Steffen
Where do you think that the 1/4wl cancelation-notch in the response of the midranges is?
Maybe your midranges "reflect" of at the end of the long/narrow initial slot, where the horn opens up drastically? And than the notch-frequency would not correspond to the 60 cm to the tweeter but to the end of the initial slot, which would be a lot shorter, meaning a higher cancelation-notch-frequency.
What do you think Christian and Mark. If this is the case, the HP6040 would work for a MEH.
Steffen
Hi Christian, sorry if I'm focusing on the delay between mid and tweeter too much....but that and the raw response of the mids are what matter ime.
A hpf filter doesn't induce any measured delay at all until high-pass is about 3kHz or higher. Even then it's not worth mentioning...for instance a 10kHz LR24 hpf will measure only 0.04ms delay.
It's the low-pass filters that add measured delay.
On a measurement of the mids without a low-pass, the measured delay vs loopback should match physical distance to mic pretty closely.
HPF on tweeter won't do anything delay wise, and any fixed processing latency will apply equally to both drivers, leaving what should be pretty close to their time-of-flight delay difference.
So knowing it's a measurement at mouth of both the tweeter and mid with same mic position is what I'm hoping to see/confirm.
BTW, have you tried Crosslite's "snap-to-rise", and "snap-to-peak on impulses".? I think it's my favorite feature so far. Makes IIR crossover time alignment, using snap-to-rise easier than anything I've ever seen.
Although I don't use IIR xovers......lol.
Never seen it so clearly/easily demonstrated, how IIR needs impulse rise times aligned, and linear phase FIR needs impulse peak times aligned
If you haven't tried them, and can't find it easy in manual......lemme know and I'll post a quick how to...
Hi Steffen...I'm not seeing any sign of a 1/4wl notch. Maybe the long diffraction-slot-throat negates such a strong reflection???
Appears so...
Hi Mark
It does because it is linear phase in the DSP!
So PLEASE don't care of the delays!
I am doing linear phase crossovers as well 😉
at the moment i am doing the delay manualy... trying to find a compromise between best addition at crossover and best step response 😉
And because you can do that "in silent" and see the impact directly, it is also very easy 😉
It does because it is linear phase in the DSP!
So PLEASE don't care of the delays!
I am doing linear phase crossovers as well 😉
at the moment i am doing the delay manualy... trying to find a compromise between best addition at crossover and best step response 😉
And because you can do that "in silent" and see the impact directly, it is also very easy 😉
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Here i have made the same 150Hz Crossover for the tweeter AND the mids. You see: everything is as it should be 😉
Aah, I see. By raw response, what I'm asking to see is devoid of any processing whatsoever, other than removal of constant delay (time-of-flight, processing latency, etc)
So pretty please 🙂, how about showing no low-pass, no delays, no nothing at all, on mid and tweeter raw responses....
Thx !
Hi Steffen
Since i have moved the mids to the front, everything is fine... or much better than before!
The walls of the Horn are verticaly VERY narrow. i think reflections from the mid- ports where destroing the frequency respinse of the tweeter. NOW where i have moved them to the front, its much better!
What i am wondering is: i have left the 1/4 role, but it doesn't seem to be a big problem... maybe because of the small slit?
Since i have moved the mids to the front, everything is fine... or much better than before!
The walls of the Horn are verticaly VERY narrow. i think reflections from the mid- ports where destroing the frequency respinse of the tweeter. NOW where i have moved them to the front, its much better!
What i am wondering is: i have left the 1/4 role, but it doesn't seem to be a big problem... maybe because of the small slit?
Like before, the 150Hz high-pass (crossover) won't effect impulse timing on either at all.
Peaks sepation does look like about 1+ms as expected.
Hi Mark
I placed a crossover in both drivers... i don't want to measure the tweeter without a filter in front! I already destroyed one TAD because of that... was pretty expensive 😉
But both crossovers are the same and almost linear phase... so it should give you a good picture 😉
I placed a crossover in both drivers... i don't want to measure the tweeter without a filter in front! I already destroyed one TAD because of that... was pretty expensive 😉
But both crossovers are the same and almost linear phase... so it should give you a good picture 😉
I can not follow... delay between mids and the tweeter is less then 2ms what is absolutly correct for the physical distance.
OK... stupid but brave as i am, here without any crossover. Of course, because of the DSP, there is an offset, but this is the same for both measurement's.
Is this now as expected?
Is this now as expected?
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Thx Christian, yep that does look right.
So i think my misunderstanding was that you are using a linear-phase high pass at 150Hz. Which would surely induce delay.
And not an IIR which doesn't.
So i think my misunderstanding was that you are using a linear-phase high pass at 150Hz. Which would surely induce delay.
And not an IIR which doesn't.
Bless you ! Lol
Sorry to hear you lost a TAD. Accidental loud sweep or something?
fwiw, i never bother high-passing CDs for any low level testing...maybe just lucky so far...and just jinxed myself !
I messed up my outputs... and so i had a loud bass sweep on the tweeter ;(
As i wrote: stupid as i am 😉
My "zero" preset for measurements in the dsp has the preset 😉
The FourAudio DSP a pretty good, just missing some more Taps. They have 5632 it total and you can use them how ever you like. You can also import FIR filters like the Q-Sys.
I could buy some more... each chassis its own one 😉
Did I read the FourAudio allows lower sample rates for low-frequency work? That would help for sure.
I got scared off of FourAudio reading the Monkey Forrest literature.
Buy some more? ..them things ain't cheap !
Be a cheapskate like me, and pick up a used 510i when one shows up for about $2000 or less (with needed I/O cards)
I got scared off of FourAudio reading the Monkey Forrest literature.
Buy some more? ..them things ain't cheap !
Be a cheapskate like me, and pick up a used 510i when one shows up for about $2000 or less (with needed I/O cards)
Only the HD2 can do that... not available anymore ;(
HaHa... yes... but you don't need monkey forest for the DSP's in the plat amps. I am just ordering the DSP's and buy Pascal amps on ebay. The FourAudio Plate amps are using the same 😉
here is an old video how to configure the DSP:
Its pretty powerfull... just some more taps would be fine 😉
Would like to, but not easy to get in germany. Q-sys is not that common and if: expensive 😉
You wrote about the SSD- problem: ist this on all units a possible problem or just the 110?