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Tang Band W8-1772 Impressions.
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Old 1st September 2009, 03:05 PM   #21
AstroSonic is offline AstroSonic  United States
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Default Response Plot Questions

Bob,

These drivers sure look promising: relatively even frequency response and T/S parameters allowing reasonable bass in manageable enclosures.

Regarding the response plots, are they for the raw driver or are your BSC and HF correction networks included? I wonder how audible the two HF peaks and the suckout between 4.5 and 6.5 kHz will be. The curves for 15 and 30 degrees off axis look very promising.

Thanks for taking the lead on this.

Regards,

Bob P.
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Old 1st September 2009, 05:14 PM   #22
Godzilla is offline Godzilla  United States
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>>> Now one stretched out so the details are visible:

Many thanks Bob! The only thing i don't like about the measurements is the dip at 150hz... otherwise it looks great.

Godzilla
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Old 1st September 2009, 08:00 PM   #23
Bob Brines is offline Bob Brines  United States
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Quote:
Originally Posted by AstroSonic View Post
Bob,

....Regarding the response plots, are they for the raw driver or are your BSC and HF correction networks included? I wonder how audible the two HF peaks and the suckout between 4.5 and 6.5 kHz will be....

Bob P.
No BCS, No EQ. The driver is in an MLTL, not on an EIC baffle.

The 4.5kHz notch only starts to appear in the 30* plot, so at normal listening angles -- 10-15* -- it is probably not an issue. The 6.5kHz notch coincides with the sibilance peak in most pop recordings. The effect is softening of the "s" and "p" sounds. Interestingly, this notch appears in every driver I have converted to phase plugs. I have to wonder if it is not the effect of the phase plug in THIS driver. The HF peaks are so narrow in terms of octaves, that you will probably not hear them. Look at these peaks as a continuing of the general rising FR.

Bob
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Old 1st September 2009, 08:02 PM   #24
Bob Brines is offline Bob Brines  United States
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Quote:
Originally Posted by Godzilla View Post
>>> Now one stretched out so the details are visible:

Many thanks Bob! The only thing i don't like about the measurements is the dip at 150hz... otherwise it looks great.

Godzilla
That dip is floor bounce. You should ignore anything below ~500Hz as artifacts of the cabinet.

Bob
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Old 1st September 2009, 08:41 PM   #25
rdf is offline rdf  Canada
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Thanks for posting this, nice work & driver. Is the elevated frequency response above ~200 Hz a baffle step artifact?
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Old 1st September 2009, 08:52 PM   #26
Bob Brines is offline Bob Brines  United States
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Quote:
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Thanks for posting this, nice work & driver. Is the elevated frequency response above ~200 Hz a baffle step artifact?
Yep! That's what baffle step looks like.

Bob
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Old 1st September 2009, 09:03 PM   #27
speakrsrfun is offline speakrsrfun  Canada
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Anyone have an idea what retail will be on these, they look good for next years project to be started in January LOL. Take care....
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Old 1st September 2009, 10:48 PM   #28
Bob Brines is offline Bob Brines  United States
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Anyone have an idea what retail will be on these, they look good for next years project to be started in January LOL. Take care....
http://www.parts-express.com/pe/show...number=264-893

Bob
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Old 1st September 2009, 11:22 PM   #29
Holger Barske is offline Holger Barske  Germany
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There's a self-taken set of TSP on the German distributor's page: http://oaudio.de/Lautsprecher-Chassi...1772::664.html
Meets Bob's measurements quite nicely.
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Old 2nd September 2009, 04:37 AM   #30
speakrsrfun is offline speakrsrfun  Canada
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Thank you sir I appreciate it, good lookin out.
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