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Dayton PC83-8 (3") test results
Dayton PC83-8 (3") test results
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Old 12th February 2018, 08:46 PM   #1
DonVK is offline DonVK  Canada
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Default Dayton PC83-8 (3") test results

I picked up a couple of these new Dayton 3 inch poly full ranges Dayton Audio PC83-8 3" Full-Range Poly Cone Driver for testing. I thought I share the results here as they were designed as a full range.

I was curious about using them as a midrange, the spec sheet indicated they should have a wide dispersion up to around 4KHz. They'll also do double duty as a test speaker an active cross over project.

The tests are geared towards off axis performance, distortion, and I did EQ them and listened for a while. The cobbled up enclosures will be sufficient for that purpose.

Index to trials:
1) Box 8L - Dayton PC83-8 (3&quot test results
2) Cylinder 4L - Dayton PC83-8 (3&quot test results
3) Box 8L + large baffle - Dayton PC83-8 (3&quot test results
4) MLTL - Dayton PC83-8 (3&quot test results
5) Omni opposed drivers - Dayton PC83-8 (3&quot test results
6) Le Cléac'h 7-Petal Horn - Dayton PC83-8 (3&quot test results
7) Le Cléac'h 11-Petal Horn - Dayton PC83-8 (3&quot test results
8) Fixing the Le Cléac'h Petal Horns - Dayton PC83-8 (3&quot test results
9) BP8 'subwoofer' to get some LF performance Dayton PC83-8 (3&quot test results
10 ) Bass Reflex - Dayton PC83-8 (3&quot test results
11 ) Tractrix Rectangular Horn - Dayton PC83-8 (3&quot test results

Last edited by DonVK; 2nd April 2018 at 08:27 PM. Reason: added index to trials
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Old 12th February 2018, 08:53 PM   #2
DonVK is offline DonVK  Canada
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Default Box enclosure 8L

TYpically they get mounted in a skinny box, so that's the first enclosure. REW and UMIK-1 used to measure at 0.5m from center speaker, and 0.9m from ground on a stand.

The curves up to 50deg off axis are pretty tight to 4K as advertised. My graph has the axis expanded compared to Dayton, but the 5dB dip at 2K is there. The box is 8L filled with fiberglass.
Attached Images
File Type: jpg DSCN2385 reduced.jpg (397.3 KB, 920 views)
File Type: jpg PC83-8 Impedance, Box 8L.jpg (111.7 KB, 906 views)
File Type: jpg PC83-8 Off axis Box 8L.jpg (154.7 KB, 896 views)
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Old 12th February 2018, 08:58 PM   #3
DonVK is offline DonVK  Canada
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Default Box 8L

Next up is fixing the FR to flatten it a bit using APO equalizer.

Its a single speaker, one moving part, and the IR looks fine.

Distortion below 300Hz is high, but in the range I was interested in (800Hz-4KHz) is OK with me.
Attached Images
File Type: jpg PC83-8 with EQ, freq, Box 8L.jpg (113.0 KB, 883 views)
File Type: jpg PC83-8 EQ Impulse, Box 8L.jpg (104.6 KB, 864 views)
File Type: jpg PC83-8 Distortion Box 8L.jpg (146.6 KB, 113 views)
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Old 12th February 2018, 09:13 PM   #4
DonVK is offline DonVK  Canada
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Default Cylinder 4L

I was curious if the box shape helped (baffle gain) or hurt (diffraction) and by how much?

Should have mentioned, the IR gate (-5ms/+10ms) and 9 cycle window is used in the FR and IR plots.

I mounted the driver in a cylinder, on the side (not end). This is suppose to have similar diffraction performance as a sphere. The speaker is mounted in a frame molded from clay to "merge" the pin cushion frame to a cylinder wall. An attempt to make it a smoother transition. It certainly has more polar symmetry than a rectangle box.

I also checked the impedance with various fills. I ended up using the fiberglass it seemed to have less FR ripple and lower impedance peak. The cylinder FR is more consistent as well. Again the entire FR is tight up to 40deg or so, but it diverges more gradually than the box.
Attached Images
File Type: jpg DSCN2388 reduced.jpg (430.5 KB, 222 views)
File Type: jpg PC83-8 Impedance, Trial Fills, Cylinder 4L.jpg (128.2 KB, 175 views)
File Type: jpg PC83-8 Off axis, Cylinder 4L.jpg (155.5 KB, 136 views)
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Old 12th February 2018, 09:33 PM   #5
DonVK is offline DonVK  Canada
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Default Cylinder 4L

Again, a little EQ to flatten out the FR using equalizer APO.

IR is well behaved like before. The distortion looks like same, flattening out at >300Hz.
Attached Images
File Type: jpg PC83-8 with EQ, freq, Cylinder 4L.jpg (116.5 KB, 158 views)
File Type: jpg PC83-8 with EQ, Impulse, Cylinder 4L.jpg (103.9 KB, 74 views)
File Type: jpg PC83-8 Distortion, Cylinder 4L.jpg (142.8 KB, 52 views)
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Old 12th February 2018, 10:37 PM   #6
xrk971 is offline xrk971  United States
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Dayton PC83-8 (3") test results
Thanks for the measurements. I have been curious about this driver as well.

I think the falloff you see below 1k is simply the baffle step. Try a big (30in wide open baffle) and see if it matches factory specs. Also, try putting mic at 0.5m and 1m off floor. Then select FDW 6-cycles gate. That removes room and floor bounce etc and lest us look at intrinsic response vs extrinsic effects of mic placement and floor bounce.

The baffle step is easily fixed with a circa 1mH parallel ~8ohm or so resistor BSC circuit.

Dayton’s measurements usually are pretty good, so I would expect it to look like this in a large baffle:

http://www.daytonaudio.com/media/res...ifications.pdf
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Last edited by xrk971; 12th February 2018 at 10:40 PM.
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Old 13th February 2018, 06:44 PM   #7
DonVK is offline DonVK  Canada
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The mic was out 0.5m from the speaker center and 0.9m off the floor.

I believe the manufacturer data sheet, so I'm not trying to refute them. Unfortunately the test conditions are rarely specified and some important details (for me) are missing.

I might try your larger baffle (30") experiment to see the effect. Maybe I can get a cheap foam board sheet from the dollar store.
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Old 13th February 2018, 09:37 PM   #8
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Default Larger baffle, to reduce bass dip

Good call @xrk971. Thanks.

I tried a larger baffle (30"x20" foam board), with your settings and the LF dip is gone. Setup pics and FR included. There is no EQ used and the previous 8L box was reused. Interesting to see the effect.
Attached Images
File Type: jpg DSCN2439 reduced.jpg (300.5 KB, 140 views)
File Type: jpg DSCN2440 reduced.jpg (394.9 KB, 154 views)
File Type: jpg PC83-8 LargeBaffle, Box8L.jpg (106.3 KB, 267 views)
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Old 14th February 2018, 12:37 AM   #9
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Dayton PC83-8 (3") test results
Good.
Thanks for trying that.
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Old 14th February 2018, 05:24 AM   #10
hollowboy is online now hollowboy  Australia
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Zaph has some notes on his test setup that I found interesting. His setup and noise floor are really good for a domestic space.

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I did a similar sequence of experiments here, where I was initially baffled (pun intended) by the notches. Even with a VERY close mic, the baffle and size still matter. I hadn't expected that.

Measurement based cone damping / treatment
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