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Dutch & Dutch 8c Review
- Thread starter hardisj
- Start date
This pure sine table everyone uses (source unknown). Since electronic music exists, it doesn't seem far fetched to use it as worst-but-still-realistic case.
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Just FYI: https://secure.aes.org/forum/pubs/journal/?elib=5147
This pure sine table everyone uses (source unknown). Since electronic music exists, it doesn't seem far fetched to use it as worst-but-still-realistic case.
For what it's worth -- and just to really drill down the idea that speakers should, in fact, measure very similarly across different measurement rigs -- here's how my spin of the 8C overlaps with Erin's:
Of course, I couldn't measure directivity reliably below 200Hz, and I have far less resolution in the low mids, but we see excellent agreement. So don't let anyone tell you you shouldn't expect consistency! (Remembering a certain youtube video...)
Of course, I couldn't measure directivity reliably below 200Hz, and I have far less resolution in the low mids, but we see excellent agreement. So don't let anyone tell you you shouldn't expect consistency! (Remembering a certain youtube video...)
Nice to see your not-Klippel-money rig kinf of validated (again).
OP
- Thread Starter
- #86
I updated the OP/review with the globes.
Horizontal Polar (Globe) Plot: This represents the sound field at 2 meters - above 200Hz - per the legend in the upper left.
Vertical Polar (Globe) Plot: This represents the sound field at 2 meters - above 200Hz - per the legend in the upper left.
This clearly illustrates the cardioid nature of the 8c. Especially when you look a more "standard" speaker like the Kef R3 (sneak peak!!!!):
Horizontal Polar (Globe) Plot: This represents the sound field at 2 meters - above 200Hz - per the legend in the upper left.
Vertical Polar (Globe) Plot: This represents the sound field at 2 meters - above 200Hz - per the legend in the upper left.
This clearly illustrates the cardioid nature of the 8c. Especially when you look a more "standard" speaker like the Kef R3 (sneak peak!!!!):
Definitely gives me some peace of mind!
OP
- Thread Starter
- #88
Oh, and just to double check even though I asked a while ago, did you compute the Spinorama or did you manually calculate it? Because to my knowledge the Klippel software still does the incorrect calculation of the Early Reflections & PIR.
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Vini darko
Major Contributor
Awesome review of a very well engineered speaker. Thankyou for all the work on this 
On a personal note those polar plots make no sense to me
fortunately the normal ones make perfect sense.
On a personal note those polar plots make no sense to me
fortunately the normal ones make perfect sense.Are all the responses shown at 2m for this speaker? This is kind of related to my earlier question of driver integration integration. Is this Klippel software able to generate response at arbitrary distances also?
Colonel7
Addicted to Fun and Learning
Yes! Unlike some other interesting designs where the speakers "disappear" in the room only after following the direction to pull them 4 feet off all walls into the roomBut your measurements here seem to suggest that, finally, we have a loudspeaker which can be placed close against a wall with the attendant LF gain without introducing a whole range of problems further up the frequency spectrum. They're not cheap but would certainly be on my shortlist if I were in the market for such a thing . Being small, unobtrusive &, placed against the wall, they're conducive to domestic harmony, too
The score should actually be higher, but my LFX code wasn’t working because it looks for -6dB point, and at 20Hz it is only down 3.5dB!!! As such, the “score w/ sub” is not accurate, but I added it for consistency.
Also, as expected, the flat in-room response from 1500Hz-15000Hz lowers the rating.
Preference Rating
SCORE: 7.2
SCORE w/ sub: 7.9
Frequency response: +/-1.7dB 25Hz-18kHz
Due to the super deep bass, my graphs that usually only go down to 30Hz needs to be extended to 20Hz, that’ll be uploaded ata later date as I want the standard scaling to be achieved.
Also, as expected, the flat in-room response from 1500Hz-15000Hz lowers the rating.
Preference Rating
SCORE: 7.2
SCORE w/ sub: 7.9
Frequency response: +/-1.7dB 25Hz-18kHz
Due to the super deep bass, my graphs that usually only go down to 30Hz needs to be extended to 20Hz, that’ll be uploaded ata later date as I want the standard scaling to be achieved.
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How do you think they differ from your setup of rme, nc502 and choice of speakers.
because you can apply eq after calibrating a mic with software. Do you think the combined sinad with eq option would be preferable to this speaker.
perhaps on value alone.
Good question which I have no answer for, other than speculation. But you can get an RME ADI-2 DAC fs + Hypex NCore NC502MP based amp for around 2k usd and that leaves some 8k usd for speakers, which is a lot of speakers to buy, until it reaches the price of the D&D 8c.
Hey NL that is pretty impressive that you got such good measurements without an NFS. Great work.
This is for sure an…intimidating speaker.
Erin, you didn’t hop on the ol‘ photo copier did you?
Erin, you didn’t hop on the ol‘ photo copier did you?
OP
- Thread Starter
- #98
If I understand you correctly, IMHO it should not be provided then. No reason to “penalize” the speaker due to the equations not taking a high-performer in to account.
OP
- Thread Starter
- #99
I did! Front side first. Unfortunately, that image is to scale.
No shame in using a logarithmic scale
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