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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: RE: JBL Harlan posted by hifido on August 13, 2010 at 19:59:36:
The Lansing Heritage site, which hosts those items I posted, has a lot of information including the amazingly large list of different systems that could be used with that cabinet. A single 130A or D130 are among the options listed. (The 130A was the woofer version of the D130, which had the aluminum dome for more treble energy. The 2220 is a direct descendant of these very old high-efficiency, low-excursion drivers.)
The cabinet as designed by JBL is ported on the bottom, standing off the floor by several inches. It's a beautiful piece of furniture if you are into the late-fifties look - though it's not exactly timeless!
I put it up for two reasons. First, it sits low allowing a very large horn to go on top and still be at an appropriate height. Second, it has a large internal volume which allows the use of high-efficiency drivers without the complications and time delay of a real corner horn.
By modern high-fidelity standards is is not a great acoustical design. The original has large expanses of unbraced wall, especially the front panel - in a modern interpretation I would brace all the panels, with 1x4 or 2x4 edgewise braces, and I would put some pretty thick absorbent on the walls - the original has 1" fiberglass on only half the walls.
The older JBL designs seem to have been worked out for unity damping factor rather than high-damping amplifiers. This was before Thiele and Small's work, and amplifiers with unity or near-unity damping factor were not uncommon. Modern software makes it easy to chose an appropriate amplifier damping factor and port tuning, which I would recommend doing unless (as in my mono vacation-cabin installation) you are really going for a fifties vibe in sound as well as looks.
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Follow Ups
- RE: JBL Harlan - Paul Joppa 13:42:08 08/14/10 (2)
- RE: JBL Harlan - hifido 14:19:11 08/14/10 (1)
- RE: JBL Harlan - Paul Joppa 20:17:16 08/14/10 (0)
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