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Starts at around 9:05.
https://www.youtube.com/watch?v=lkwyvW5Dons&t=2s
Follow Ups:
I just looked at the LRS information.
Rising bass looks a lot lot my 1.6s while the 'after' graph is what my panel looks like......as measured by stereophile.
Too much is never enough
I'm sorry.....I've tried to watch this guy's vids a couple times and catch myself napping.
All that jabber is meaningless without hearing. And listeniing to a speaker on YouTube THAN over my computer? Worthless....
I'm supposed to get wound up about phase and crossover points?
Too much is never enough
Danny doesn't seem to like series crossover designs. Danny often questioned the performance of VMPS speakers too, which also used series crossovers.
I think he would agree IN PRINCIPLE with 'Peter Gunn'.....about crossovers.
I'd like some input on how they look TO AN AMP......And compare with a standard 'parallel' cross type.
Too much is never enough
Danny posted the before (series) and after (parallel) impedance plots in his YT video.
Dave.
Can you summarize? If possible?
I used up my entire MONTHS worth of patience with nonsense when doing a search online at my coutnty recorders online records 'office'.
My search returned 226 PAGES of docs for the ONE day I was interested in.
Of course? My doc of interest was on PAGE 200......
My eyes were crossed and I had a headache......
Too much is never enough
The impedance plots start at 14.50 and runs for @ 1 minute.
Stock XO dips to 3.1 ohms at XO point. New XO has a rise at the XO point and has a slightly higher overall impedance.
One might think a rise could be problematic as well for the opposite reason as a dip.
ANY competent 4ohm rated amp can deal with either of the impedance 'curves'........SS best, maybe, but I still don't see much of an issue with Tube......
Tube amps may have a slight issue with the peak while SS I think will 'brush it off'....?
Too much is never enough
Summarize what?
Series or parallel, it doesn't make the speaker any harder (or easier) to drive.
Series crossovers will generally have a flatter impedance curve which might make them preferable for a high-ish output impedance amp.
The reason Magnepan has switched to series xovers is because the component values become somewhat smaller and can fit the narrow thickness of baffles better. Other than that, there are no advantages to series crossovers at all. The trade-off preference always benefits a parallel configuration......all other things being equal.
Dave.
I wanted a summary of the video-guys conclusions about the LRS and his change of crossover.
But I waded thru that part of the video.......I;m still working on a headache. I went to the SD county recorders office looking for something in particular. My search was narrowed to 226 PAGES. I plowed in and found what I wanted on Page 220, by which time I had a headache which I am almost recovered from.
but YOU were a big help. I can see why magnepan went in that particular direction. At the expense of having multiple input terminals, useful for biamp / biwire types.
Gunn was also a modder of crossovers. I've seen some of his work.....
Too much is never enough
Thanks for the post. Hopefully the modders will chime in with their impressions of the XO kit.
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: 04/27/21
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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