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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: Anybody excited about the new Rethms? posted by Paul Folbrecht on March 9, 2007 at 05:18:49:
I haven't experimented with Lowthers in OBs but I might add a few ideas that those who are may try.The PM6a driver may be the most appropriate for OB loading since it has the smallest magnet and thus probably a bit lower efficiency/less top-heavy sound. The larger-magnet drivers are really intended for horn loading. Sometimes cheaper is better!
The JE Labs OB design uses a bit of floor bounce to fill in the lower midrange/upper bass, which might be very welcome with this sort of driver.
Since Lowthers are a bit at risk of being top-heavy (thin) in an OB design, I'd try upping the Zout of the tube amplifier by using 16 ohm taps on the 8 ohm driver. This might help fill out the lower midrange. I've long thought it would be fun to try true-pentode or true-tetrode output stages, ie current amplifiers, with Lowthers in OB. What is the sound of one 6550 clapping?
Due to their design the Lowther drivers are particularly excursion-constrained which is normally not so much of a problem with back horn loading. However, in an OB installation they are really flapping around uselessly in the bass region. I would at least experiment with simple line-level highpass filtering, at the very least a 6db slope (one capacitor) filter at 100hz or so.
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- Lowthers in OB - nl 04:17:17 03/10/07 (0)
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