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Neumann KH 750 DSP Reviews - where are they?

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djdolcevita

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Hey there, I'm currently considering buying a Neumann KH 750 DSP for my Small Studio, but I just don't seem be able to find any actual reviews with measurements eg, frequency curve, THD, Decay and so on. How is it that there is no review with measurements on such a respectable Brand's newest sub? Everyone says it's a really good sub, but no one measures it?

Maybe I'm missing something somewhere. Thanks for the help, cheers!
 
More measurements here: https://www.soundandrecording.de/equipment/neumann-kh-750-dsp-subwoofer-mit-dsp-system-im-test/

Edit:
Plus 1st party measurements directly from Neumann
Harmonic Distortion at 95 dB SPL in 1 m.gif Max SPL at 1m (red 10% green 3% blue 1%).gif KH 750 + KH 80 DSP Frequency response.gif KH 750 + KH 80 DSP Group Delay.gif
 
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I would avoid them for now, they seem to be having either QC or shipping issues as three! (yes, 3) of them that I received were faulty with the driver being shot.
 
Strangely, there are not many mentions of this. No statement from Neumann either.
If this is widely confirmed and they stay silent, it would really leave a "Geschmäckle", as the Germans say...
 
They are sending a 4th woofer directly to me on a pallet.
They state that shipping is fine as long as the woofer is sent on a pallet to start with (small euro one) so that the orientation is always correct and there are no hits.
However, none of the stores send it like that. I will see if this directly sent and pre-tested woofer arrives intact.
Definitely a bit of a fragile product.

It seems that the issue mainly happens with rough shipping in this part of the world, but they also had cases in Germany. I assume they will make a statement in the future as the ones that have the issue might only be going out as they did take quite a lot of investigation to find the cause (2 months since first one was returned).

That said, the last broken one was manufactured Jan 2025 so a bit weird they are surprised. Not sure what the shipping company in Croatia does with those packages.
 
arescec said:
...they also had cases in Germany.
Click to expand...
I tried to find such - not found so far (but only web search, I'm not in any other networks).
Also no mention in the buyers comments at Thomann, which is probably the largest seller.
A faulty (or counterfeit) batch of drivers? :oops:
 
It's an outlier situation for sure, so it seems, hopefully they get a grip on the situation. They are a well renown company, but regardless it can happen to the best of company none the less.
4 times !!!!!!
 
respice finem said:
I tried to find such - not found so far (but only web search, I'm not in any other networks).
Also no mention in the buyers comments at Thomann, which is probably the largest seller.
A faulty (or counterfeit) batch of drivers? :oops:
Click to expand...

There are a few with rattle problems that I managed to find using Perplexity, high chance it is something like this. But still, even if they changed the production process I feel like they should have tested it a bit better. I wonder if the issues happen in southern countries are down to heat that we have here that causes the glue to soften or something similar?
 
arescec said:
There are a few with rattle problems that I managed to find using Perplexity, high chance it is something like this. But still, even if they changed the production process I feel like they should have tested it a bit better. I wonder if the issues happen in southern countries are down to heat that we have here that causes the glue to soften or something similar?
Click to expand...
The idea of glueing the heavy magnet to the chassis seems, well, bold to me, but I'm not an engineer.
What I think might be possible: they don't make the woofers and got a batch that was not quite "kosher".
 
respice finem said:
The idea of glueing the heavy magnet to the chassis seems, well, bold to me, but I'm not an engineer.
What I think might be possible: they don't make the woofers and got a batch that was not quite "kosher".
Click to expand...
To be fair gluing is the standard, especially on cheaper ones. We used to knock them off with a hammer on scrap ones. The idea is that the magnet also sticks to the basket and if I were to assume from the monitor drivers, they are probably using a steel stamped one instead of the more fancy alloy.
We are paying for engineering here more than quality for sure. Also using black listed capacitors that will probably not make it that far. However, the reviews and sound is compelling.
 
Neumann however are not exactly the cheaper ones :)
But thanks, interesting... The c(r)apacitors too...
I guess I should worry...
 
respice finem said:
Neumann however are not exactly the cheaper ones :)
But thanks, interesting... The c(r)apacitors too...
I guess I should worry...
Click to expand...

Well, KH80/KH120 series uses capacitors that are known to bulge (to save a few $) and the KH120 driver sure looks like the Peerles SDS (https://www.soundimports.eu/en/peerless-by-tymphany-sds-p830656.html) which is a $30 part (https://www.audiosciencereview.com/forum/index.php?threads/neumann-kh120-disassembly-pictures.11975/) and https://www.audiosciencereview.com/forum/index.php?threads/neumann-kh80dsp-teardown.24116/ for capacitors which are CapXcon.
The AI overview matches the forum sentiment:
1759878950809.png


After repairing a year old Krk 10-3 G4 due to bulging cap I am not too happy about this but fingers crossed they can last 10-15 years.
 
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arescec said:
Well, KH80/KH120 series uses capacitors that are known to bulge (to save a few $) and the KH120 driver sure looks like the Peerles SDS (https://www.soundimports.eu/en/peerless-by-tymphany-sds-p830656.html) which is a $30 part (https://www.audiosciencereview.com/forum/index.php?threads/neumann-kh120-disassembly-pictures.11975/) and https://www.audiosciencereview.com/forum/index.php?threads/neumann-kh80dsp-teardown.24116/ for capacitors which are CapXcon.
The AI overview matches the forum sentiment:
View attachment 481272

After repairing a year old Krk 10-3 G4 due to bulging cap I am not too happy about this but fingers crossed they can last 10-15 years.
Click to expand...
I can only hope they didn't use these caps for my KH 310A. They shouldn't, really, because they sell many of these to studios etc. If these buyers will encounter "premature" failures, the subsequent shitstorm would be disastrous for the manufacturer. And in studios, they are on all day long...
 
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