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Speaker Asylum: RE: To set the record straight on this antique JBL stuff... by villastrangiato General speaker questions for audio and home theater. |
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In Reply to: RE: To set the record straight on this antique JBL stuff... posted by Thorsten on July 12, 2012 at 22:52:45:
There is way too much incoherent babbling by Thorsten above to correct point by point. So I will reiterate and re emphasize the main underlying problem as it seems Thorsten is intent on spreading his confusion to others. Thorsten doesn't know constant directivity from the tip of his nose. A given loudspeaker's beamwidth or radiation pattern cannot vary all over the place as it does with the D130 and 075 JBL and produce a constant directivity result. As the name implies, "constant" directivity means that as frequency increases across a loudspeaker's operating spectrum, the portion of radiated sound in a given direction remains essentially CONSTANT. A cursory look at the graphs I posted demonstrate clearly that the drivers in question are not capable of constant directivity - particularly over the frequency bands Thorsten was suggesting for them. Thorsen saying the 075 bullet tweeter maintains constant directivity is a clear indication that he doesn't have a clue what he's talking about. Over a +/- 20 degree window, practically every driver in existence will appear to have constant directivity. True constant directivity implies uniform radiation pattern with frequency over a wider angle - a design objective for high fidelity in a near field listening environment. Toole, who essentially wrote the book on directivity of loudspeakers, makes it pretty clear in his papers that response off axis to about 60 degrees needs to be a carbon copy of the on axis response (excepting a minor uniform level of attenuation with each increase in off axis angle). If the reader of this thread has any doubts, the Revel Ultima Salon 2 (a product design inspired in part by Toole) I linked to earlier possesses a directivity plot that is TEXTBOOK constant directivity. The response plots of the JBL D130 operated wide band and the 075 bullet tweeter responses look nothing like this. Neither do the plots of the Tannoy 12 inch two way referenced by Thorsten. Compare the plots of these speakers and you will get a better understanding of what constant directivity means and why constant beamwidth only suggests constant directivity when it occurs over a relatively wide listening angle. Forty degrees listening angle is clearly not in the same ballpark as 120 degrees. It might be in Thorsten's warped, myopic world view but not where real loudspeaker designers are concerned. Thorsten, given that every successive post of yours on this subject has provided further evidence of your ignorance on the subject, it might be wise for you to stick with electrical fuse design.
(ROFLMAO)
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Topic - Best Mid-Bass of All Times! - Belgarchi 18:51:03 07/8/12 ( 80)
- RE: Best Mid-Bass of All Times! - Tom Brennan 13:46:13 07/10/12 ( 0)
A well known DIYer used that one... - Presto 09:00:34 07/10/12 ( 1)
- RE: A well known DIYer used that one... - Belgarchi 16:50:29 07/11/12 ( 0)
RE: Best Mid-Bass of All Times! - rkeman 07:43:20 07/10/12 ( 0)
The old Dynaudio 15W-75 and 17W were known to do some of the best mid-bass in a dynamic driver - cfb 06:11:53 07/10/12 ( 0)
One of my favorites... - mkuller 19:47:37 07/9/12 ( 0)
Dare I include the big Acoustats? - Ozzie 12:44:30 07/9/12 ( 1)
- RE: Dare I include the big Acoustats? - DKL 18:52:37 07/9/12 ( 0)
Ahh...semantics. I thought you were going to discuss one octave of bass. - jeffreybehr 11:02:36 07/9/12 ( 1)
- Thanks, you are right... - Belgarchi 16:55:53 07/11/12 ( 0)
RE: Best Mid-Bass of All Times! - Presto 08:59:53 07/9/12 ( 0)
I'm sure it's quite good - badman 07:45:54 07/9/12 ( 0)
RE: Best Mid-Bass of All Times! - villastrangiato 05:00:58 07/9/12 ( 47)
- AE woofers - Scholl 18:16:34 07/13/12 ( 1)
- RE: AE woofers - huynguy.enlatoi1988@gmail.com 20:34:16 07/13/12 ( 0)
RE: Best Mid-Bass of All Times! - Belgarchi 10:30:08 07/9/12 ( 44)
- RE: Best Mid-Bass of All Times! - Thorsten 04:51:21 07/10/12 ( 40)
- RE: Best Mid-Bass of All Times! - Belgarchi 05:32:40 07/11/12 ( 39)
- RE: Best Mid-Bass of All Times! - Thorsten 06:47:36 07/11/12 ( 38)
- ,,,and the enclosure size needed for large woofers... - Belgarchi 10:21:45 07/11/12 ( 1)
- RE: ,,,and the enclosure size needed for large woofers... - Thorsten 10:57:03 07/11/12 ( 0)
- You forget the response in the mids..... - Belgarchi 09:58:04 07/11/12 ( 34)
- RE: You forget the response in the mids..... - Thorsten 10:42:54 07/11/12 ( 21)
- That would most likely deliver... - E-Stat 17:59:10 07/11/12 ( 20)
- RE: That would most likely deliver... - Thorsten 05:23:44 07/12/12 ( 19)
- Do you find that - E-Stat 06:12:10 07/12/12 ( 18)
- RE: Do you find that - Thorsten 08:43:51 07/12/12 ( 17)
- To set the record straight on this antique JBL stuff... - villastrangiato 13:00:15 07/12/12 ( 8)
- RE: To set the record straight on this antique JBL stuff... - Thorsten 22:52:45 07/12/12 ( 7)
- RE: To set the record straight on this antique JBL stuff... - villastrangiato 07/13/12 05:11:37 07/13/12 ( 6)
- RE: To set the record straight on this antique JBL stuff... - Thorsten 07:57:57 07/13/12 ( 5)
- Straightening out the mess Thorsten leaves behind... - villastrangiato 07:04:28 07/14/12 ( 4)
- Getting minimum acoustic sense into this mishmash of false dogma... - Thorsten 08:15:57 07/14/12 ( 3)
- ugh - villastrangiato 10:06:05 07/14/12 ( 2)
- RE: ugh - Thorsten 10:46:17 07/14/12 ( 1)
- double ugh - villastrangiato 11:48:57 07/14/12 ( 0)
- Ah, narrow directivity tweeter - E-Stat 09:06:57 07/12/12 ( 7)
- RE: Ah, narrow directivity tweeter - Ozzie 11:31:31 07/15/12 ( 3)
- RE: Ah, narrow directivity tweeter - Thorsten 00:01:45 07/16/12 ( 0)
- RE: Ah, narrow directivity tweeter - villastrangiato 13:21:58 07/15/12 ( 1)
- RE: Ah, narrow directivity tweeter - Thorsten 00:20:05 07/16/12 ( 0)
- RE: Ah, narrow directivity tweeter - Thorsten 09:17:45 07/12/12 ( 2)
- RE: Ah, narrow directivity tweeter - E-Stat 09:27:05 07/12/12 ( 1)
- RE: Ah, narrow directivity tweeter - Thorsten 10:04:55 07/12/12 ( 0)
6 - 7 octaves if you're into low fi... - villastrangiato 10:35:18 07/11/12 ( 11)
- RE: 6 - 7 octaves if you're into low fi... - Thorsten 11:16:34 07/11/12 ( 10)
- RE: 6 - 7 octaves if you're into low fi... - villastrangiato 13:01:50 07/11/12 ( 9)
- RE: 6 - 7 octaves if you're into low fi... - Thorsten 13:30:22 07/11/12 ( 8)
- Double face palm time, yet again... - villastrangiato 18:00:23 07/11/12 ( 3)
- RE: Double face palm time, yet again... - Thorsten 05:34:47 07/12/12 ( 2)
- Are you as deranged as your posts suggest? - villastrangiato 08:19:59 07/12/12 ( 1)
- RE: Are you as deranged as your posts suggest? - Thorsten 09:43:54 07/12/12 ( 0)
- Never saw measurements proving your 'point.' - Belgarchi 16:34:50 07/11/12 ( 3)
- RE: Never saw measurements proving your 'point.' - Thorsten 05:22:30 07/12/12 ( 2)
- I think - Presto 11:28:05 07/12/12 ( 1)
- RE: I think - Thorsten 11:44:45 07/12/12 ( 0)
Actual measurements "small vs. big midbass"... - Thorsten 06:56:46 07/11/12 ( 0)
RE: Best Mid-Bass of All Times! - John Elison 23:45:51 07/9/12 ( 2)
- RE: Best Mid-Bass of All Times! - Belgarchi 10:14:33 07/11/12 ( 1)
- RE: Best Mid-Bass of All Times! - John Elison 07:51:20 07/14/12 ( 0)
JBL D130 - Thorsten 01:54:36 07/9/12 ( 5)
- Do you know of any plans for the JBL D130 as a 2-way with a wave-guide tweeter? - Frihed89 21:54:48 07/10/12 ( 1)
- RE: Do you know of any plans for the JBL D130 as a 2-way with a wave-guide tweeter? - Thorsten 22:09:53 07/10/12 ( 0)
RE: JBL D130 - Ozzie 12:40:16 07/9/12 ( 2)
- RE: JBL D130 - Thorsten 20:35:45 07/9/12 ( 1)
- RE: JBL D130 - Ozzie 07:32:05 07/10/12 ( 0)
RE: Best Mid-Bass of All Times! - hahax@verizon.net 23:07:53 07/8/12 ( 7)
- RE: Best Mid-Bass of All Times! - Disbeliever 23:43:01 07/13/12 ( 0)
RE: Best Mid-Bass of All Times! - Belgarchi 10:33:10 07/9/12 ( 5)
- How are you using it? - caspian@peak.org 12:10:30 07/9/12 ( 4)
- RE: How are you using it? - Belgarchi 16:45:23 07/11/12 ( 0)
- RE: How are you using it? - Belgarchi 16:53:51 07/9/12 ( 2)
- Everybody has their "best" for certain reasons... - villastrangiato 18:09:12 07/9/12 ( 1)
- RE: Everybody has their "best" for certain reasons... - Belgarchi 18:24:22 07/9/12 ( 0)
RE: Best Mid-Bass of All Times! - DanWilson 19:35:26 07/8/12 ( 5)
- RE: Best Mid-Bass of All Times! - Inmate51 12:38:32 07/9/12 ( 1)
- Well, "bass" is the "base" of music - caspian@peak.org 11:01:55 07/10/12 ( 0)
...and now it's 'midbase'! :-) Dan, that should be 'midbass'. (NT) - jeffreybehr 11:06:08 07/9/12 ( 2)
- RE: ...and now it's 'midbase'! :-) Dan, that should be 'midbass'. (NT) - Wojciech 19:55:06 07/10/12 ( 1)
- RE: ...and now it's 'midbase'! :-) Dan, that should be 'midbass'. (NT) - Scott L 12:53:55 07/12/12 ( 0)