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In Reply to: RE: Danny does the LRS posted by emailtim on April 21, 2021 at 13:36:09
I suspect it will be awhile.Danny's altered the network to a parallel configuration and the components are physically much larger and will require an external enclosure.
Also, his measurement technique of replacing each driver with a resistor to measure the other is flawed. In normal configuration, there's a mechanical crossover between both drivers that contributes to the final result.
In his testing case he's taking away that mechanical crossover. So, the individual plots he's showing for the stock configuration are not correct. And actually not correct for the revised the setup either.....but you just don't need a resistor to fake the other portion of the networkDave.
Edits: 04/27/21Follow Ups:
I have just finished doing Danny's parallel crossover on my 1.7 Although the parts (2 aircore inducters + 1 sonicap)are bigger than the original XO, i could fit them in the 1.7 with slight alterations on the 'opening' in the MDF frame. Offcourse taking the original XO out first.
So don't let this talk about external enclosures put one off. Just be prepared to do some carpentry on the frames... MDF is quite easy to mod and the 'cover' will cover everything up ;-)
No, i have no instruments for any measurements
What are your impressions of the differences in xovers?
I am still making changes to the mod because after the new XO was in place, the high frequency energy was to high in my room. I thought about roomchanges bus just yesterday i decided to try the standard 1,5 ohm resistor that Magnepan uses in the high signalpath. That really made the difference...The high frequency is now some what tamed.
About the crossover differnce:
Let met first say that i have not heard a 1.7i
But my original 1.7 sounded not so good as i had expected, although much more lower energy and depth than the previously owned MG-12's
During the XO change i discovered that on one speaker the treble foil was burned. I might have listented to them since i got them. Don't really know.
My impressions after the tweak with the GR research parts:
Huge improvement overall.
- much more musical detail
- much longer decay
- as 'real' as i ever heard instruments. The 'wood' of the piano is now something i hear.
- you hear a sorts of new sounds. previously hidden under the veil
- vocals: you can now hear the layering of second vocals, where before this was 'one'
- with bad recordings... the show up so some musical enjoyment is also lost... that is a pity you sometimes have with upgrades:-(
This is momentarily as i have just listend to is for about 20 hours, so its nog fully burned in. And then the resistor mod is only evaluated with two albums. So it is not final.
Do you have any before and after REW measurements ?
His uncorrected measurement looks very close to ASR's measurement from 200Hz up.
His aggregate corrected measurement (assuming no resistors) doesn't look bad.
I understand.
My point being that (in this case) operating the drivers separately is not the same thing as in a speaker that has separate drivers not occupying the same membrane. :)
There's a certain amount of cross-contamination (or IM) that's inherent to this arrangement. A simple summation of the two individual responses does not equal the total system response.....as it would with most other speakers.
Dave.
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