Massdrop x JBL LSR30X Powered Speakers Discussions | Drop

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Massdrop x JBL LSR30X Powered Speakers

Audiophile

FULL DISCUSSION

Peter JBL

JBL, Director Recording and Retail Solutions

Jul 1, 2017

JBL LSR30X DESIGN GOALS AND PERFORMANCE
Hello MassDrop Community. As you know, we at JBL Professional have developed a custom version of the very popular LSR305 powered studio monitor specifically for the Massdrop community.
In producing the LSR30X, our goal is to celebrate the popular LSR305, producing a limited quantity with an extra level of performance and refinement. How does this special LSR30X differ from the standard LSR305? Here are the details:
An Extra Measure of Performance:
While the LSR30X utilizes the same High Frequency and Low Frequency transducers as used in production of the LSR305, there is one significant difference. Following production, measurements of all LSR30X speakers are carefully reviewed to identify pairs of speakers that have a performance variation of less than 1dB. The benefit of matched pairs and use of a 1dB criteria optimizes system performance in the area of imaging, resulting in enhanced depth and detail heard in stereo recordings. While the patented Image Control Waveguide gives the LSR305 an advantage in this area, the additional care taken to produce matched pairs gives the 30X a refined level of performance. Just as a matched pair of microphones is used to optimize the stereo image in a recording, matched 30X pairs optimize the stereo image in playback of the recording.
The Actual Figures:
In the development of the LSR305, our internal design criteria was +/- 3dB from 49 Hz to 20 kHz with a usable Frequency Range of 43Hz to 22 kHz. As mechanical devices, low and high frequency transducers vary in performance. To ensure all speakers meet or exceed our criteria, on the assembly line all speakers are measured relative to an engineering standard unit. In this test, the speaker being measured can vary from the standard by no more than +/- 1.75dB at certain frequencies to 2.25dB at others. While the average performance is consistently better, these figures represent the "worst-case" speaker-to speaker-match. The LSR30X speakers offered by Massdrop have a guaranteed speaker to speaker variation of no more than +/- 0.5 dB, which is total of only 1dB across the bandwidth!
In order to guarantee +/- 0.5 dB variation as shown on the graph in the description we added an additional process in the production of these speakers.
A Measure of Class and Refinement:
The refined appearance of the LSR30X are the result of effort and additional cost. The LSR305 enclosure is made of dense MDF wood fiber covered with a vinyl finish for durability. The fascia of the speaker, the “Baffle” is slightly textured and painted with a satin black paint. Rather than a vinyl finish the LSR30X has a special glossy black painted furniture-finish. Preparation of the enclosure surface starts with manual application of putty and a carful process of sanding by a skilled operator on the line. The enclosure is carefully cleaned to prepare for the application of primer coat. Once dry, the enclosure is sanded fine finish sanding process. The enclosure is cleaned prior to painting with a high-gloss polyurethane top-coat.
After this has dried, the finish is buffed to produce a smooth, high-gloss surface. This manufacturing process yields a furniture-finish that is not only elegant, but also more durable than traditional lacquer. The supplied hemispherical feet contribute to superior imaging by isolating the speaker from the supporting surface, reducing interactive resonance, resulting in a tighter image.
We are proud of the LSR30X speakers and it is our wish that they will deliver years of satisfaction that those fortunate to own them.
Sincerely,
Peter Chaikin Director, Recording and Retail Solutions JBL Professional Harman International

Jul 1, 2017

MusicIsGreat

205

Jul 3, 2017

Peter JBLCan you describe the process for the front enclosure glossy application. Did you first filled the plastics baffle where the waveguide is located, behind it with epoxy or some other inert material in order to enhance highs by providing rigidity? Then applied the piano gloss finish or you just applied the finish without that preferred additional preparation step? If you had, this would be a heck of a solid monitor without any possible front panel vibrations. Let us know. Thank you!

Jul 3, 2017

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