JBL came to mind. I auditioned a new professional-grade JBL monitor and was not overly impressed. By chance, the next day, a pristine pair of ‘s came up. Here is a very superb pair of JBL Professional Monitors from the early 70’s. They are OWX enclosures which were used with several. JBL / L Professional Studio Monitors * Beautifully restored and upgraded Photo. Share |. Previous | Next. JBL / L Professional Studio.

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The sensitivity of the compression driver on the by horn was about dB from Hz up until its rolloff above 3K. Secondly, it would be nice kbl have sensible response controls for the system. If you look at the impedance curve you see impedance peaks that correspond to the response peaks.

Made by 3D printing FDM technology. Studios 433 build their main monitors into soffets over the control window and the was just too big. Don developed a sidewall contour that gave a great polar pattern for a wide range of frequencies.

For example a cycle cutoff would dictate that horn area should double every 38 millimeters. This is just my opinion and I do realize that a lot of great JBL speakers were designed contrary to this.

Back in the acoustical gramophone days 4330 had figured out that Exponential area growth gave the most extended acoustical load to the transducer. Altec made thinly veiled copies with their “Manta Ray” horns.

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It is up to the crossover network to take this rolled off response and makes it flat. Due vie – professionali – reflex. Secondly, it would be nice to have sensible response controls for the system. Studios typically build their main monitors into soffets over the control window and the was just too big. Learn More – opens in a new window or tab Any international shipping is paid in part to Pitney Bowes Inc.

Horns that were expected to sell in volume could be cast in aluminum, such as the Altec and Don, now at JBL, was to develop a line of horns and at the same time needed to change the design enough to get around the other patents. Add to watch list. Thanks for the quick picture – very nice and mirror imaged too.

Exponential growth simply means that the cross sectional area grows a constant percentage for a fixed unit of length along the horn.

Reasonable Price for 3 Pairs of JBL 4430’s

The slower the area grows the lower the cutoff frequency. Don’s big theater horns would have been cost prohibitive and heavy if aluminum diecast due to their large size and relatively low projected sales volume.

First samples were from a low tech molding process reaction injection molding? Slice such a horn from front to back at any angle through the vertex and the cross section would be the same.

The item you’ve selected was not added to your cart. Last activity on AK at 11am today. 4330 consequence was a periodic ripple in frequency response.

Used JBL L Floorstanding speakers for Sale |

This amount is subject to change until you make payment. The sensitivity of the compression driver on the by horn was about dB from Hz up until its rolloff above 3K. Most of the work in this network was in getting the best blend between woofer and horn.

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Please enter 5 or 9 numbers for the ZIP Code. The slower the area grows the lower the cutoff frequency.

Reasonable Price for 3 Pairs of JBL ‘s | Audiokarma Home Audio Stereo Discussion Forums

Measured in this way most of the JBL compression drivers would have flat response from several hundred Hz to about 3kHz. They were in production longer than any other JBL main studio monitor, being introduced in and not discontinued until for the and for the The curve will be massaged a dB here and a dB there until the group primarily Gary Margolis and John Eargle for this product is happy. With the by horn the polars are so consistent and the directivity index so flat that the on and off axis response looks just like the terminated tube measurement of the compression driver.

Putting a crossover between the main horn and a small super tweeter type horn is problematic, though. The horn then modifies this response via its acoustic load at 3430 low end its and via its directivity index at the high end.

Theand especially thewere very large and were sometimes referred to ironically as “Japanese bookshelf speakers”. The consequence of the ripple was a slight coarsening of the sound of the midrange, nbl noticeable on pink noise.