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Magnepan LRS Crossover

66.135.250.58
Posted on May 17, 2022 at 14:51:46
KillerB808
Audiophile

Posts: 9
Location: Hawaii
Joined: May 17, 2022
 Does anyone have the values/models for the capacitor and inductor in a stock LRS crossover? I got the itch to mod my LRS with new binding posts and internal wiring and wanted to scope out the parts before opening it up.
KillerB808

 

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RE: Magnepan LRS Crossover, posted on June 9, 2022 at 12:56:32
KillerB808
Audiophile

Posts: 9
Location: Hawaii
Joined: May 17, 2022
 Has anyone on the forum upgraded their LRS crossover and what effects/improvements did you experience? I know there is a cap and bypass cap with an iron core inductor on the stock crossover. Wondering if anyone replaced the cap(s) and used a air-core wire or foil inductor?
KillerB808

 

RE: Magnepan LRS Crossover, posted on June 13, 2022 at 13:35:15
westly197
Audiophile

Posts: 10
Location: San Diego
Joined: May 28, 2022



The caps in mine were a 100mF electrolytic and 10mF Polly cap in parallel, the iron core inductor was 0.860 mH.

Here is the wiring from the back:

 

RE: Magnepan LRS Crossover, posted on June 13, 2022 at 13:39:32
westly197
Audiophile

Posts: 10
Location: San Diego
Joined: May 28, 2022



Photo

 

RE: Magnepan LRS Crossover, posted on June 13, 2022 at 13:43:58
westly197
Audiophile

Posts: 10
Location: San Diego
Joined: May 28, 2022



I upgraded using the GR Research kit which changes it a bit and made huge improvements in the sound. The kit uses quality parts and just the inductors and caps retail for more than the kit. The kit almost fits with minor modification and the cap showing.

 

RE: Magnepan LRS Crossover, posted on June 13, 2022 at 13:45:53
westly197
Audiophile

Posts: 10
Location: San Diego
Joined: May 28, 2022


I won't post the values as that belongs to GR Research, but this is the wiring.

 

RE: Magnepan LRS Crossover, posted on June 13, 2022 at 13:55:17
westly197
Audiophile

Posts: 10
Location: San Diego
Joined: May 28, 2022



Parts in place, cover is abs plastic with GR Research "Tube Connectors" I did have to shorten the tube connectors removing the crimp area and using just the end of the solder area.

 

RE: Magnepan LRS Crossover, posted on June 13, 2022 at 14:12:04
westly197
Audiophile

Posts: 10
Location: San Diego
Joined: May 28, 2022



The photo above is what I removed, the Nuts, set screws, fuse holder, tweeter link were all ferris metal, not doing anything good for the signal. A good amount of tin is removed as well.

If you were to build an external crossover you could move to copper ribbon inductors and copper film caps, but they are entirely too large to fit in the speaker, not to mention the increased cost. I was very pleased with the improvement in clarity and balance, the kit truly raises them up several levels allowing them to compete with 3K+ speakers IMHO, not bad for a $600 speaker + $259 upgrade. I also ordered Magna Risers but they are around 6 months out on delivery times. I also felt the design changes by GR Research offers a significant part of the improvement over just replacing the stock parts with better components.

 

RE: Magnepan LRS Crossover, posted on August 23, 2022 at 20:49:44
KillerB808
Audiophile

Posts: 9
Location: Hawaii
Joined: May 17, 2022
 Thanks for the full run through of your mods and impression on the GRS mods. I was thinking about upgrading the crossover now that I am out of warranty.
KillerB808

 

RE: Magnepan LRS Crossover, posted on August 23, 2022 at 21:13:21
westly197
Audiophile

Posts: 10
Location: San Diego
Joined: May 28, 2022
 I think it's totally worth it, I was just listening to my un-modified 1.6 QR's and they definitely have more of that Maggie sound, with the midrange voice coming through, but it just isn't as accurate to the recording. The modified LRS have a significantly more even response across the entire frequency range and they now do so much better with all music types. If I planned on keeping them I think I'd upgrade them too, but my wife thinks they are just too big, so they are up for sale.

 

RE: Magnepan LRS Crossover, posted on August 25, 2022 at 04:26:40
Roger Gustavsson
Audiophile

Posts: 2058
Location: Huskvarna
Joined: February 12, 2010
 To me, the GR Research crossover a different voicing of the LRS. Those who like the LRS as they come from the factory may be a bit disapointed.

 

RE: Magnepan LRS Crossover, posted on September 9, 2022 at 14:19:42
KillerB808
Audiophile

Posts: 9
Location: Hawaii
Joined: May 17, 2022
 Roger,

Can you expand on the differences in tuning? I am thinking of doing an outboard crossover so I can swap out components easily.
KillerB808

 

RE: Magnepan LRS Crossover, posted on September 9, 2022 at 14:23:31
KillerB808
Audiophile

Posts: 9
Location: Hawaii
Joined: May 17, 2022
 That 0.860 mH inductor seems to be a custom value. I found 0.820 to be more typical online. Seems like both are within overlapping tolerance range so a 0.820 should be fine?
KillerB808

 

RE: Magnepan LRS Crossover, posted on September 9, 2022 at 18:10:19
Roger Gustavsson
Audiophile

Posts: 2058
Location: Huskvarna
Joined: February 12, 2010
 With a series crossover like in the LRS, changing the value of the coil will influence the capacitor as well. Not sure what will happen, never done series crossovers.

 

RE: Magnepan LRS Crossover, posted on September 9, 2022 at 19:14:13
KillerB808
Audiophile

Posts: 9
Location: Hawaii
Joined: May 17, 2022
 I guess what I really meant is since you have heard the GR crossover in relation to the stock crossover and I'd like you to expand on the differences between the two if you could.
KillerB808

 

RE: Magnepan LRS Crossover, posted on September 10, 2022 at 05:29:32
Roger Gustavsson
Audiophile

Posts: 2058
Location: Huskvarna
Joined: February 12, 2010
 I have not heard the LRS with the crossover from GR Research but from the published frequency response curves, they must sound different, probably brighter, more forward.

 

Not the same thing, but just to add, my Magnestand-modded 1.6QRs, posted on September 10, 2022 at 05:54:57
MWE
Audiophile

Posts: 2202
Location: Burlington, NC
Joined: June 8, 2000
 (also with a series crossover) were likewise more forward than stock, excessively so, IMO.



Mark in NC
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon

 

RE: Not the same thing, but just to add, my Magnestand-modded 1.6QRs, posted on September 12, 2022 at 18:55:09
Roger Gustavsson
Audiophile

Posts: 2058
Location: Huskvarna
Joined: February 12, 2010
 I heard the LRS at Magnepan today, the only speaker they demonstrate at the factory. Not the best conditions for evaluation there. I am used to bigger Magnepans so I was not impressed.

 

Did you travel here primarily to go to the Magnepan factory? nt. , posted on September 13, 2022 at 04:47:24
MWE
Audiophile

Posts: 2202
Location: Burlington, NC
Joined: June 8, 2000
 Nt.


Mark in NC
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon

 

RE: Did you travel here primarily to go to the Magnepan factory? nt. , posted on September 13, 2022 at 05:56:42
Roger Gustavsson
Audiophile

Posts: 2058
Location: Huskvarna
Joined: February 12, 2010
 No, we made a trip in the ¨swedish¨ areas of Minnesota, it is just outside White Bear Lake. Being an owner of Magnepan speakers since 1980, it was ¨must¨to visit Magnepan.

 

Well, that worked out nicely! Glad you you've had a chance to visit them. nt. , posted on September 13, 2022 at 06:51:17
MWE
Audiophile

Posts: 2202
Location: Burlington, NC
Joined: June 8, 2000
 Nt.

Mark in NC
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon

 

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