robocop horny speaker

[Andysu]

what type speaker horn is it ?

is it this

 

[amirm]

Looks identical to me.

 

[fpitas]

Sure looks like it.

 

[mhardy6647]

Yes the photo in the screen capture shows a CobraFlex horn.
These were have been* in production for a long time, under several different brand names.

https://products.electrovoice.com/binary/Corbreflex%203%20Engineering%20Data%20Sheet.pdf

They have been used in both domestic hifi and commercial sound reinforcement now and again. I'll offer no further comment

__________
* Last I knew, they were still available. Looks like it...
https://www.parts-express.com/EV-Cobreflex-IIB-Sectoral-Horn-300-155?quantity=1

 

[fpitas]

For loud PA stuff, just like that guy is doing:

Home

Electro-Voice Cobreflex IIB Sectoral HornThe Cobreflex® Series of folded sectoral horns from EV / University Sound features a patented design that eliminates high frequency phase cancellation and improves intelligibility. Ideal for use with the ID Series and 1800 Series horn drivers, the...

www.parts-express.com

 

[fpitas]

Yes the photo in the screen capture shows a CobraFlex horn.
These were have been* in production for a long time, under several different brand names.

https://products.electrovoice.com/binary/Corbreflex%203%20Engineering%20Data%20Sheet.pdf

They have been used in both domestic hifi and commercial sound reinforcement now and again. I'll offer no further comment

That acute fold will play havoc with FR. But you knew that already

 

[MAB]

It's what he blasts over those PA horns that really kills me...

 

[mhardy6647]

I was able to trace the Cobraflex back to 1953 courtesy of https://www.alliedcatalogs.com/flipbook/1953_allied_radio_catalog.html

By the late 1950s Within a few years, the Cobraflex was on the same page(s) as University's domestic hifi offerings.

1956 Allied Radio Catalog

Flip-through every page of this 1956 Allied Radio Catalog containing vintage radios, phonographs, amplifiers, amateur / short wave radios, knight kits & electronic parts.

www.alliedcatalogs.com

 

[fpitas]

I was able to trace the Cobraflex back to 1953 courtesy of https://www.alliedcatalogs.com/flipbook/1953_allied_radio_catalog.html

View attachment 314451


By the late 1950s Within a few years, the Cobraflex was on the same page(s) as University's domestic hifi offerings.
View attachment 314452

1956 Allied Radio Catalog

Flip-through every page of this 1956 Allied Radio Catalog containing vintage radios, phonographs, amplifiers, amateur / short wave radios, knight kits & electronic parts.

www.alliedcatalogs.com

It's a compact way to get good horn loading, as long as high fidelity isn't a priority.

 

[mhardy6647]

It's a compact way to get good horn loading, as long as high fidelity isn't a priority.

Two data points (strictly anecdotal, of course*) from a quick search at https://worldradiohistory.com/

data point the first (1954):

source:

https://www.americanradiohistory.com/hd2/IDX-Audio/Archive-Audio-IDX/IDX/50s/Audio-1954-Mar-OCR-Page-0045.pdf#search=%22cobraflex%22

data point the second (1970):

source:

https://www.americanradiohistory.com/hd2/IDX-Audio/Archive-Audio-IDX/IDX/70s/Audio-1970-02-OCR-Page-0063.pdf#search=%22cobraflex%22

______________________
* This is Audio Anecdotes Review, right?

Am I deaf? And what is the next step up?

This thread proves that measurements don’t tell you what you might prefer We don't really know how the test was conducted and it was probably not rigorous to account for everything. It doesn't prove much of anything except maybe to be cautious about what people say online.

www.audiosciencereview.com

 

[fpitas]

Two data points (strictly anecdotal, of course*) from a quick search at https://worldradiohistory.com/

data point the first (1954):
View attachment 314453
source:

https://www.americanradiohistory.com/hd2/IDX-Audio/Archive-Audio-IDX/IDX/50s/Audio-1954-Mar-OCR-Page-0045.pdf#search=%22cobraflex%22

data point the second (1970):
View attachment 314454
source:

https://www.americanradiohistory.com/hd2/IDX-Audio/Archive-Audio-IDX/IDX/70s/Audio-1970-02-OCR-Page-0063.pdf#search=%22cobraflex%22

______________________
* This is Audio Anecdotes Review, right?

Am I deaf? And what is the next step up?

This thread proves that measurements don’t tell you what you might prefer We don't really know how the test was conducted and it was probably not rigorous to account for everything. It doesn't prove much of anything except maybe to be cautious about what people say online.

www.audiosciencereview.com

In that last picture, the horns sure look like 811s.

 

[fpitas]

As for using the Cobreflex for hi-fi, well, people do a lot of things

 

[mhardy6647]

In that last picture, the horns sure look like 811s.

Reading between the lines of the description, there are both Cobraflex and 811Bs., I think.

... he was determined to build a system that could faithfully reproduce organ music. Four University 15" woofers take care of the extreme bass (each side) and they cross over at 150 Hz to a University C15W, then a Cobraflex horn, an Altec 802D and two University H600's for the high frequencies.

... and no, I AM NOT obsessive!

 

[fpitas]

Odd to refer to the horn by its driver alone, but that must be the case.

 

[Andysu]

okay , cobraflex
horns are they more less the same used on emergency vehicles as i have to cover my ears when those pass by on the road , ear shattering , ear bending , maybe why the same siren sound used in movies doesn't sound anywhere near

are these of any real use for hi-fi , do they have honky sound that can be addressed with Peq , i have no experience with them , what is the frequency response ?

 

[mhardy6647]

Odd to refer to the horn by its driver alone, but that must be the case.

Odd indeed -- but pretty sure that's what's going on.
Even though the opposite tactic was applied to the Cobraflex (which is a horn; the driver for it is an "optional extra" ).
EDIT: Of course, one could put an 802D driver onto a Cobraflex horn, but an adaptor would be required (Altec 2-bolt to 1-3/8″-18 TPI).
I stand by my original diagnosis (or interpretation, as the case may be).

PS: I hope y'all noticed the SPL estimate for the Great Dane: "rated output - probably +100 dB"[ sic ]
Think of it: 100 dB SPL (@ 1 meter?) per 1 dogpower (DP). Of course, I don't know the conversion factor for DP to watts, and the bark impedance isn't specified.

 

[mhardy6647]

i have no experience with them , what is the frequency response ?

@Andysu The FR will depend on both the horn and the driver, as well as how well matched the exit geometry of the latter is matched to the throat of the former.
Here's a pretty good, well-written, and extremely practical white paper on the subject from Electrovoice:

https://electrovoice.com/media/downloads/ev_pabible-17-add16-mismatching_drivers_and_horns-1986.pdf

Typically*, though, the FR curve will look sort of like a "monadnock"**.

The shrillness of public safety horns is, one might say, designed in. The horn & driver are tuned to maximize cacophony. That isn't quite true for PA applications (as opposed to sirens), but it can sure seem that way. As mentioned above, some fairly respectable high-sensitivity loudspeaker systems in the early hifi era used the Cobraflex horn for midrange or "treble".

_______________
* remember: All generalizations are false, including this one.
** Here's a typical monadnock (in fact, the one for which this geological feature is named).

As an aside, southern New Hampshire's Mount Monadnock is reputed to be the second-most 'climbed' mountain on earth (after Mt. Fuji/ Fujiyama).

 

[fpitas]

are these of any real use for hi-fi , do they have honky sound that can be addressed with Peq , i have no experience with them , what is the frequency response ?

I have been unable to find a frequency response, which should tell you something. I would not use them for hi-fi today, since much better horns are available. The folding of the Cobreflex is a great idea for making it more compact, but has consequences of internal standing waves. Could you EQ it half to death and get something worthwhile? Well...maybe.

 

[mhardy6647]

I am really, TRULY NOT OBSESSED with this topic. Just academically curious about the venerable Cobraflex.

https://products.electrovoice.com/binary/ID30CT%20Engineering%20Data%20Sheet.pdf

The document above shows the FR (as the "fundamental" in a harmonic distortion plot) of a specific EV driver (University ID30C) on a Cobraflex III horn.

As the genie says in Disney's cartoon version of Aladdin:

It's not a pretty sight.

Spoiler

EDIT: It's actually not too bad from ca. 300 to 3000 Hz. I suspect that those two notches are related to the folded horn configuration as @fpitas mentioned a few posts earlier.

 

[fpitas]

I am really, TRULY NOT OBSESSED with this topic. Just academically curious about the venerable Cobraflex.

https://products.electrovoice.com/binary/ID30CT%20Engineering%20Data%20Sheet.pdf

The document above shows the FR (as the "fundamental" in a harmonic distortion plot) of a specific EV driver (University ID30C) on a Cobraflex III horn.

View attachment 314530

As the genie says in Disney's cartoon version of Aladdin:

Spoiler

EDIT: It's actually not too bad from ca. 300 to 3000 Hz.

Thanks! I suppose were one determined, you could EQ it.