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In Reply to: RE: Danny Richie of GR Research VS Magnepan posted by BDP24 on January 04, 2021 at 00:56:04
His plots don't show the "low end." (Everything is 200Hz and above.)
The only way to bring the low end down would be to use an inductor with much increased DCR. If he did that, I don't see the wisdom in that approach. The system is already very low in efficiency.
Also, in my opinion, the top end of the stock 1.7 is actually a bit too bright without the resistor in. I think Danny's hearing might be going if wonders where the highs are. :)
I'm well aware of how the 1.7 tweeter is wired and works. But Danny chose to reconfigure it. It's actually very easy to do by clipping one leg of the 10uF capacitor. But he made it sound like a complicated process and probably confused some folks. :)
Dave.
Follow Ups:
The pair of 1.7's I heard didn't sound bright, but they did sound somewhat "wispy": thin, un-fleshed out, no color or body to instruments.I'm not aware of a general consensus that the 1.7 sounds bright. in fact, quite the opposite: soft. Davey, you found the ET LFT-8b to be bright too, choosing to use the lowest output tap on the tweeter. Perhaps you are more sensitive to very high frequencies (the LFT-8b tweeter high-pass filter is at 10kHz) than average?
Brightness in a loudspeaker is located at a far lower frequency than 10kHz of course, but the LFT-8b tweeter filter is 1st-order, so that driver is still putting out a lot of sound at 5kHz (6dB down relative to 10k), even 2.5kHz (12dB down).
Edits: 01/04/21
I'd still like to know how Danny "brought the low end down" on these speakers without using an inductor with significant DCR. That info is not in his video.
If you can explain that one to me (without speculating) it would be appreciated.
Dave.
Dave,
If you look at the plots, the 1.7 bass is down by @ 3dB @ 200Hz and @ 5dB @ 300Hz, but the rolloff at 65Hz is still @ 2.5KHz suggesting the bass panel's slope rolloff is shallower after the mod.
Is it possible he also changed the bass panel's XO ?
Tim, in the video DR states he left the bass/midrange driver filter slope stock. A call to him may answer every question one has.
Like everyone else here, I know only what's in the video. Anyone who buys DR's mod kit for the 1.6 and 1.7 will get a pair inductors, and be free to provide it's value to any interested party, assuming DR doesn't remove any value designation on the part, as do many other modifiers. For that same reason, a call to DR asking for that value may have his request denied. ;-)
Edits: 01/04/21
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