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So the pre-selection and preparation is almost done, methodology rethinked, ajustable chair with the measuring stick all set 🙂
We'll be ready to get everything started by the end of the week.
Can't wait to see the first results.
We'll be ready to get everything started by the end of the week.
Can't wait to see the first results.
Few testing today:
First, the center of the drivers will be exactly 107cm (42.1'') from the floor.
The distance from the center of the driver to the ear will probably be between 1.6m and 1.9m (63-75'') but i'll need to confirm the final distance later. Distance from the wall might change as well, it will depend of the measures, etc...
First, the center of the drivers will be exactly 107cm (42.1'') from the floor.
The distance from the center of the driver to the ear will probably be between 1.6m and 1.9m (63-75'') but i'll need to confirm the final distance later. Distance from the wall might change as well, it will depend of the measures, etc...
Ah, you have the BM2500.4, that's a different balance of strengths to the '251.3. The latter will work well up to 2 or 3kHz, but the directivity match wouldn't look great up there. If you're going for a 4-way system crossing at 500Hz or so to a mid you should be fine.
A 4-way is the ultimate. still, very complex, and difficult to get right. If your search for the "World's best" mid range is part of your quest for the ultimate 4-way, you simply need to decide where your "center" crossover point is (?) By that, I mean where do you cross your mid-bass to mid range ?
18db/oct ANALOGUE active crossovers are the best here, provided you follow the one octave linear-overlap rule.
Not really.
This whole test is not about my personnal quest for a speaker project but rather to fill a scientific curiosity.
Of course, if my Vox ac-1.6 get beaten by a Scan, chances are high that i'll put the Vox's for sale 😛
15" coax consists of one 15" midbass and one tweeter/compression driver. 15" coax without a tweeter/compression driver is a plain old 15" midbass. Coaxs are sold with or without tweeter/compression driver. Take a look at this 12" midbass coax which comes without compression driver:
http://www.sica.it/media/Z007852.pdf
Check out this review with the old Behringer 8024 digital eq and Vinyl by Thorsten Loesch which he highly recommend.
Behringer Ultracurve Pro 8024 Digital Equalizer Go to your nearest Pro-Audio shop and buy one. NOW! Review By Thorsten Loesch
And its over 15 years ago, even the newer Behringer 2496 is dated. ADC and DAC has continued to advance since than.
Any chance you can throw in some vintage drivers into the mix. My friend keeps claiming there is something magical about those drivers and I really want to know they really can be identify after EQ. Something like the Saba greencone, Diatone p610, Coral Holey Basket, etc...
BTW, looking at your setup. My comment is WOW.
No Accuton C173-6-90 or BMS 4594ND-mid? I'd say this list is lacking if the "world's best" is to be found.
Sorry, you're about one year late. 😉
seriously, the list could never end... At some point we have to decide the contenders and start with it. More rounds with other contenders could be added later..
Impossible to have all contenders or perfect methodology- that will always be debated- but comparisons like this remain very interesting on their own terms.
will start later today with crossovers & EQ for the final set-up.
Fingers crossed, i hope i'll be able to make a solid 4 octaves.
Fingers crossed, i hope i'll be able to make a solid 4 octaves.
Sounds great have fun and interesting research.
Because you announced steep stopband filter slopes and probably have plenty power full DSP engine consider some small test FIR verse IRR steep stopband filter slopes. Below two examples is IRR and then FIR domain of 0,5kHz-7kHz 8th order LR band-pass, and because those steep filters relative high time lag into IRR domain gives long decay tails in waterfall suggest such listening test IRR verse FIR if you happen run up in 8th order slope class, if you happen filter out with 4th order slopes or lower then forget above thoughts : )
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The compression driver is supposed to work down to 500hz in a short horn? The performance of the CD has alot to do with the chosen horn.
The biggest challenge as of now is to find a bandwith that is both realistic (limits of the 4 drivers) and... listenable.
I don't see (hear) how 500hz-5khz could be listenable. Yes, you can hear sounds coming from it, but it's not ideal.
I don't see (hear) how 500hz-5khz could be listenable. Yes, you can hear sounds coming from it, but it's not ideal.
Record it and mix in a virtual tweeter and woofer and listen through headphones? That would make switching much easier, the blind test could be done online with a large listening panel, diy readers.
If the blind test is just the midrange itself on a baffle and in a room, its dispersion will affect its sound. The mids with wide dispersion like the ss 10f should sound more open as they will have a flatter power response in the passband.
If the blind test is just the midrange itself on a baffle and in a room, its dispersion will affect its sound. The mids with wide dispersion like the ss 10f should sound more open as they will have a flatter power response in the passband.
First in-room measurement trial:
So far it's doing very well. I positionned the baffle as this:
1.2 meter from the wall behind (w/acoustic foam tiles)
2.7 meters from both sides
2.3 meters from the ceiling
When i place the mic +/- 1.3m distance from the driver and with 400-6500hz settings, there is little room interaction. At least nothing out of the ordinary and nothing that makes a huge impact on the EQ i have to apply. I'll continue testing the position of the kit, especially a greater distance from the wall behind, but it doesnt seem like a big concern so far, thanks to the large size of the room.
So far it's doing very well. I positionned the baffle as this:
1.2 meter from the wall behind (w/acoustic foam tiles)
2.7 meters from both sides
2.3 meters from the ceiling
When i place the mic +/- 1.3m distance from the driver and with 400-6500hz settings, there is little room interaction. At least nothing out of the ordinary and nothing that makes a huge impact on the EQ i have to apply. I'll continue testing the position of the kit, especially a greater distance from the wall behind, but it doesnt seem like a big concern so far, thanks to the large size of the room.
Made the first EQ attempt on the first driver. Got a very decent frequency response with only 3 bands EQ:
2000hz -3.8db Q0.6 (High-shelf)
1890hz -3.1db Q3.8 (peak)
4800hz -3.0db Q1.7 (peak)
That's an easy one, i'm expecting to struggle a little more with the others, but it's a good start.
2000hz -3.8db Q0.6 (High-shelf)
1890hz -3.1db Q3.8 (peak)
4800hz -3.0db Q1.7 (peak)
That's an easy one, i'm expecting to struggle a little more with the others, but it's a good start.
