If I remember well, those Peerless mids also only had a aluminium demodulation ring?
The distortion of those was extremely even, better than this.
They say the SIG series do have a demodulation ring btw.
Although, looking at the impedance graph, it doesn't seem to be well optimized maybe?
The distortion of those was extremely even, better than this.
They say the SIG series do have a demodulation ring btw.
Although, looking at the impedance graph, it doesn't seem to be well optimized maybe?
It's interesting that the online brocures for the smaller dayton signature drivers specifically mention a demodulation sleeve, the 8" driver has no mention... this doesn't mean that it may not have one, but you would think they would mention it...
It would be a bit of a strange decision.
The RS225 is the same price and has two shorting paths.
The RS225 is the same price and has two shorting paths.
Try again, the RS225 and the rest of the midbasses have no shorting ring, just an aluminum phase plug.
from the datasheet: "High-end low-distortion motor with two shorting paths to reduce inductance"
and other datasheet: "Low-distortion high excursion motor system with two short-circuit paths"
Having torn one open, I disagree. The one path is the phase plug. It says paths, not rings, sleeves, etc.
From which year was that?
And out of curiosity, any photos? 🙂
Paths = rings or sleeves, there are no other ways.
Maybe a phase plug, but that is just one path and NOT paths.
They very clearly state two paths, so there must be two paths in there.
Btw, what's more confusing, is that the RS180 has a copper shorting ring?
source:
https://audioxpress.com/article/test-bench-dayton-audio-rs180p-8-7-reference-series-midwoofer
source:
https://audioxpress.com/article/test-bench-dayton-audio-rs180p-8-7-reference-series-midwoofer
Well, it's been awhile now. They certainly didn't use to have them in the aluminums. The paper i have not seen inside. I do know they were counting the plug as a path. Even so, the motors were only minorly low HD, and not with the likes of others like Excel, Usher, SS, and Wavecor. The Le is higher than all of the above, and HD is only in the -25 to -35dB range. I have a RS150 aluminum on the shelf that has no shorting paths w/o the plug. I kept for this reason.
Could they be counting an aluminum former? I wouldn't think so.... it was a brown box issued RS150.
I always thought that, at the price, the Dayton RS225xzy drivers had some of the lowest HD available... again, at the price. When I started this thread, I considered the RS225 to be the best value at ~$85, but I was wondering how much close could the $30-$60 drivers get to it in terms of performance.
Maybe I am wrong, and there are other drivers which out class it. Obviously I am not an expert on drivers in this price range, or I would not have started this thread.
This is the RS225P-8A at 5.6V. HD2 is unimportant, but HD3 is better than -50 dB from 60 Hz to 500 Hz. Pretty good for $85 I would say... It may get a little muddy above 1k, but running an 8" driver above 1k involves a lot of compromises anyway. [Thank you HiFiCompass.com]
Maybe I am wrong, and there are other drivers which out class it. Obviously I am not an expert on drivers in this price range, or I would not have started this thread.
This is the RS225P-8A at 5.6V. HD2 is unimportant, but HD3 is better than -50 dB from 60 Hz to 500 Hz. Pretty good for $85 I would say... It may get a little muddy above 1k, but running an 8" driver above 1k involves a lot of compromises anyway. [Thank you HiFiCompass.com]
Exhibit A: Sig 225-4
just over 22/34 ohms at 10/20Khz respectively.
Reference:
https://www.parts-express.com/pedocs/specs/295-656--dayton-audio-sig225-4-specification-sheet.pdf
Exhibit B: RS225-4
12 / 16 ohms at 10/20Khz respectively.
Reference:
https://www.parts-express.com/pedocs/specs/295-376-dayton-audio-rs225-4-spec-sheet-revised.pdf
A flatter impedance curve usually correlates with lower inductance. For the Dayton RS to have no inductance control/demodulation device, aside from a phase plug, to have such a low/flat impedance curve?- well that must be some kind of magic.
other RS drivers-
RS225-8 in 12L (just under half cu ft) sealed 2.83V drive level
Reference B:
http://www.5een.co.uk/RS225.htm
10” woofers H3 comparison
Moreover, high order distortion is lower an even higher drive level:
Reference C:
https://www.justdiyit.com/grand-comparatif-de-10-pouces-partie-2/2/
RS180-4:
Reference D:
https://hificompass.com/en/speakers/measurements/dayton-audio/dayton-audio-rs180-4
I wonder whether removing the phase plug caused a rise in @wolf_teeth ’s HD to only -25 to -35 down, by other mechanisms. (Air noise/loss of seal/other?)
just over 22/34 ohms at 10/20Khz respectively.
Reference:
https://www.parts-express.com/pedocs/specs/295-656--dayton-audio-sig225-4-specification-sheet.pdf
Exhibit B: RS225-4
12 / 16 ohms at 10/20Khz respectively.
Reference:
https://www.parts-express.com/pedocs/specs/295-376-dayton-audio-rs225-4-spec-sheet-revised.pdf
A flatter impedance curve usually correlates with lower inductance. For the Dayton RS to have no inductance control/demodulation device, aside from a phase plug, to have such a low/flat impedance curve?- well that must be some kind of magic.
other RS drivers-
RS225-8 in 12L (just under half cu ft) sealed 2.83V drive level
Reference B:
http://www.5een.co.uk/RS225.htm
10” woofers H3 comparison
Moreover, high order distortion is lower an even higher drive level:
Reference C:
https://www.justdiyit.com/grand-comparatif-de-10-pouces-partie-2/2/
RS180-4:
Reference D:
https://hificompass.com/en/speakers/measurements/dayton-audio/dayton-audio-rs180-4
I wonder whether removing the phase plug caused a rise in @wolf_teeth ’s HD to only -25 to -35 down, by other mechanisms. (Air noise/loss of seal/other?)
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At the price point, they are good performance. I'm merely stating that I don't see the copper or rings in the aluminums, and that HD should be lower if they actually had those. The paper are much newer, and likely have them integrated, but Dayton only started using rings, caps, or sleeves a few (6?) years ago now in general on the smaller drive units.
Note: much past the resting position for the driver the driver's inductance near resonance has little bearing on the non-linear distortion of the driver.
Practically speaking then much of the driver's contribution to lower distortion from typical shorting rings is wasted on the driver - again, at lower freq.s. At upper freq.s nearing and beyond 1 kHz it's a different matter.
Normally, i am pretty good at this stuff. Scott is correct with regard to where the shorting ring benefit applies. However, it appears egg is on my face this time.
I was incorrect. Sorry for the misinformation about the ring. The ring and plug are the 2 paths.
This is the RS150-8 brown box driver:
I was incorrect. Sorry for the misinformation about the ring. The ring and plug are the 2 paths.
This is the RS150-8 brown box driver:
I was just gonna say, the RS150 has shorting rings as well.
Some more measurements of the RS225-8 @ 90dB
It's slightly better than the 4ohm version (most 8ohm variants are actually)
Some more measurements of the RS225-8 @ 90dB
It's slightly better than the 4ohm version (most 8ohm variants are actually)
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