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Old 11th May 2013, 09:41 AM   #451
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Bob, thanks for your response! I have simulated this passive circuit situation in the parametric EQ. Changed Q values, reduced BSC level a bit and now the sound is much better. I will try to change resistor values in passive filter and see if some improvements can be made.

Maybe someone can suggest a measurement software where EQ before measurements could be applied? I want to see response I like so I can try to make passive filter as close as possible.
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Old 11th May 2013, 11:50 AM   #452
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Darkheart View Post
Bob, thanks for your response! I have simulated this passive circuit situation in the parametric EQ. Changed Q values, reduced BSC level a bit and now the sound is much better. I will try to change resistor values in passive filter and see if some improvements can be made.

Maybe someone can suggest a measurement software where EQ before measurements could be applied? I want to see response I like so I can try to make passive filter as close as possible.
Holmimpulse is an excellent program to do measurements with. Get a good mic or make one from a Panasonic WM61A capsule. It need not be absolute calibrated but just flat in response.
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Old 13th May 2013, 09:37 PM   #453
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I didn't saw any EQ in Holmimpulse. I have Behringer ECM8000 already and did some measurements with REW, but I need apply an EQ before making measurements.
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Old 18th May 2013, 07:40 PM   #454
Scott L is offline Scott L  United States
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Default 1772's horn loaded

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Originally Posted by Dkalsi View Post
Hi,

I know many here have used the W8-1772 in an open baffle application, but I was curious whether anyone here has tried the W8-1772 with horn such as the Azurahorns 160Hz or the Oris 150 horns.

Any idea why this driver would or would not work in the aforementioned application. I did speak to a fellow forum member who used the TB W8-1808 with the Oris 150s and was able to achieve excellent results.

Unfortunately, I am not as technically competent to be able to determine after reviewing the specs for the W8-1772 that it would be as (or more or less) suitable as the W8-1808 for front loaded horn application.

Any thoughts/comments would be much appreciated.

Thanks,
D
Just for kicks, I loaded my pair in some vintage 1939 Jensen Exponential horns. As far a back chamber, it's simply a 9 inch by 18 inch long cardboard tube loaded with acoustic material. While no means "state-of-the-art" they do some things that are simply amazing. I sure can hear the effect of the horn, so I'd say an ORIS type would do much, much better. Even so, the sound quality is very robust and rich, by NO MEANS is it as lean as when I tried these in an open baffle. I mean night and day differences. The highs are quite a bit subdued, though. I must stress, they are far from perfect, but what they get right, they get soooooo right. Some of my fellow club members insist it's all about the round horn.
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Old 30th July 2013, 10:30 AM   #455
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Default W8-1772 open baffle

This is my second speaker building project and the best sounding pair of speakers I ever heard. The baffle plan comes from Troels OBL-11. Instead of his midrange and tweeter combo I decided to try W8-1772 and go fully active.

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Works without BSC if LPF 2nd order + HPF 1st order @175hz used. I got better results using lower crossover point (80hz LPF + 115hz HPF both 4th order) and adding -5db BSC to W8-1772 @230hz. I also use -5db high-shelf for bass driver @60hz + -3db@1500hz and -3db@7000hz high-shelf for W8-1772.

Measured right speaker from listening position:
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Old 30th July 2013, 10:34 AM   #456
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very

very

nice
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Old 30th July 2013, 11:24 AM   #457
xrk971 is offline xrk971  United States
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Darkheart,
Wonderful looking and sounding build there. Congratulations!
I don't think I have ever seen such a nice frequency response curve flat from 30 Hz to 20 kHz. How is the spatial presentation and imaging? Is it tolerant to moving outside of sweet spot as I hear 8 in full range drivers can have 'beam like' HF. Also, how are you implementing all your filtering? Is that all done via mini DSP and biamping? That would be a pain to do all that passively.
Great job !
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Old 30th July 2013, 01:23 PM   #458
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Thanks!
Imaging and spatial presentation is quite good, but not perfect. They don't disappear like narrow baffles, but it's not my priority. There is some beaming, of course, if I move more then 0,5m too each side, but usually I don't. The off-axis response of W8-1772 is relatively good.
All filtering is done via JRiver's Media Center in-built DSP. My current source is Asus Xonar Essence ST + Xonar H6, which feeds two stereo amps (NAD C355BEE for bass and NAD C326BEE for widerange).

Forgot about one more filter - at 250hz there is -5db notch filter for baffle hump.
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Old 30th July 2013, 08:58 PM   #459
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that is way cool! - - hey Bob Brines - does the Alpair10 'beat" 1772?
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Old 30th July 2013, 09:35 PM   #460
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Originally Posted by freddi View Post
that is way cool! - - hey Bob Brines - does the Alpair10 'beat" 1772?
The 1772 and the Alpairs are apples and oranges. I don't have a pair of 1772's on hand at the moment for a direct comparison, so this is from memory.

The W8-1772 is a heavyweight. It will fill a fairly large room with a lot of sound and it has a both a decent top and bottom. In a decent cabinet, the 1772 will get into the low 30's with authority. The dispersion at the top is good enough that a tweeter in not required. It remains my favorite 8" driver. Does everything a FF225WK plus a FT17H can do.

Alpairs are a different animal. They are about finesse. You need to sit down with a pair and play some transparent music. Two cuts that pretty much say it all are Alison Krauss "Forget About It" and Fleetwood Mac "Never Going Back Again". I am listening to the new A10M.3's and I am getting the impression that they are A7.3's on steroids. You will hear that the Ailpairs are intolerant of poor electronics (usually intended to mean anything not tubes). I don't really think so, as they sound wonderful on T-amps. However, they are death to bad recordings. Don't bother playing anything mastered for pop radio this century. You will not enjoy the results.

Bob
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