[makan]

There's no way of telling for sure so I would recommend getting an ohm-meter and measuring it.

I bought them second hand in 2020 from somewhere else. Unfortunately the add is no longer around.

Email audeze and they will let you know if it is the 100 or 200 ohm version. I have done this a few times.

 

[kali77]

Email audeze and they will let you know if it is the 100 or 200 ohm version. I have done this a few times.

Perfect thanks!

 

[makan]

Ask the owner for the serial number which is located on the headband yoke. If it’s lower than 4142270 it’s a 100-ohm. If it’s higher than that it’s 200-ohm.

@kali77 this might help you have an idea before you get a definitive response from Audeze

 

[kali77]

@kali77 this might help you have an idea before you get a definitive response from Audeze

Thanks! I saw that hence why I was assuming mine were 100ohm (serial 4142177), right below that range.

 

[kali77]

Looks like they are 200ohm as they have the felt spacer.

From Audeze:
“

Thanks for your inquiry. The first 200 ohm Serial is 4142270(or anything after Feb 3, 2016 build date), but at this point most 100 ohm units have also been converted. The best way to tell is by looking for the felt spacers between the wooden rings and the earpads. If those spacers are present, then they're accompanied by 200 ohm drivers. If the earpads are adhered directly to the wood cups, they have 100 ohm drivers. In any case, if you're happy with them, you don't need to take further action at this time.”

 

[makan]

Looks like they are 200ohm as they have the felt spacer.

From Audeze:
“

Thanks for your inquiry. The first 200 ohm Serial is 4142270(or anything after Feb 3, 2016 build date), but at this point most 100 ohm units have also been converted. The best way to tell is by looking for the felt spacers between the wooden rings and the earpads. If those spacers are present, then they're accompanied by 200 ohm drivers. If the earpads are adhered directly to the wood cups, they have 100 ohm drivers. In any case, if you're happy with them, you don't need to take further action at this time.”

If it was replaced with 200 ohm drivers by audeze itself, they should have a record of it unless perhaps the earpads were replaced with a new felt put in or drivers were replaced at the dealer/distributor level

 

[KaiSc]

Get an el cheapo multimeter and a quick Ohm measurement will reveal what’s going on.

Later the meter can serve you well here and there.

Just an example:

https://www.amazon.com/-/de/sspa/cl...-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1

 

[TheAbyss2022]

Get an el cheapo multimeter and a quick Ohm measurement will reveal what’s going on.

Later the meter can serve you well here and there.

Just an example:

https://www.amazon.com/-/de/sspa/click?ie=UTF8&spc=MTo4Njg0MDk4Mzk0MTA1MDQxOjE3MDc2ODQzMzU6c3BfYXRmOjMwMDAxNDAwOTczNDkwMjo6MDo6&url=/dp/B00KXX2OYY/ref=sr_1_1_sspa?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=3BYO68LG0SI2N&keywords=Multimeter&qid=1707684335&sprefix=multimeter%2Caps%2C196&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1

Does the sensitivity ever alter from unit to unit? LCD 4 is supposed to have a sensitivity of 97db/1mw

 

[KaiSc]

Does the sensitivity ever alter from unit to unit? LCD 4 is supposed to have a sensitivity of 97db/1mw

Yes, specifically between 100 and 200 Ohm the voltage sensitivity (the figure that practically really counts) changes significantly.

By chance Audeze replaced my 200 Ohm drivers with ones measuring 89 Ohm, and voltage sensitivity went up by almost 10 dB.
I asked Audeze about the enormous impedance variations, they answered, they had a run of drivers that came out this way.

On the first repair they had sent me drivers with 124 Ohm, so… another variant.
One of these was broken during shipping, so they had to redo the repair.

Through the whole process Audeze behaved very professional, communicative and friendly , A+ service!

 

[TheAbyss2022]

I've always had the sample rate conversion on within Roon and I just noticed that turning it off gives my LCD 4 a much better defined bass with more slam.

The bass sounds almost too muddy and undefined somehow with the sample rate conversion.

 

[elwappo99]

Good morning. I have an older set of LCD-4’s. From reading here it seems they are the 100ohm version. Serial 4142177. Should I leave them as is? Or is there a benefit to sending them in to be converted? Any noticeable sound difference's? Thanks!

FYI, Audeze will not convert 100ohm to 200ohm without paying the full price for a pair of drivers. They quoted me $1200.

 

[KaiSc]

Good morning. I have an older set of LCD-4’s. From reading here it seems they are the 100ohm version. Serial 4142177. Should I leave them as is? Or is there a benefit to sending them in to be converted? Any noticeable sound difference's? Thanks!

As long as they work OK, there’s no reason to change.
100 Ohm are even “easier to drive”.

 

[marcan]

As long as they work OK, there’s no reason to change.
100 Ohm are even “easier to drive”.

IIRC the 100ohm was much harder to drive.
Sensitivity is more important than impedance on that matter.

 

[KaiSc]

IIRC the 100ohm was much harder to drive.
Sensitivity is more important than impedance on that matter.

My LCD-4 is just the other way round.
As expected, the lower impedance is significantly “easier to drive”.

As reported in this thread, my 200 Ohm LCD-4 got repaired by Audeze.

On their first delivery they mounted 124 Ohm drivers, and Voltage sensitivity upped by 5.5 dB.
As one driver of these was broken during shipping, Audeze replaced them again, this time with a 89 Ohm driver pair.
This upped the Voltage sensitivity by full 10 dB, relative to the original 200 Ohm driver.


These results are completely logical, as I don’t think Audeze changed magnet strength.

 

[marcan]

My LCD-4 is just the other way round.
As expected, the lower impedance is significantly “easier to drive”.

As reported in this thread, my 200 Ohm LCD-4 got repaired by Audeze.

On their first delivery they mounted 124 Ohm drivers, and Voltage sensitivity upped by 5.5 dB.
As one driver of these was broken during shipping, Audeze replaced them again, this time with a 89 Ohm driver pair.
This upped the Voltage sensitivity by full 10 dB, relative to the original 200 Ohm driver.


These results are completely logical, as I don’t think Audeze changed magnet strength.

Okay, so you've got new drivers rated at 124 Ohms. I've also had a driver replacement for my 200-Ohm set, and the replacement definitely showed improved sensitivity.
I was actually referring to the initial drivers rated at 100 Ohms. I had the chance to try them out, and they were more difficult to drive.