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Markaudio Pluvia 7 vs Markaudio Alpair 7MS. A subjective and objective comparison.
Markaudio Pluvia 7 vs Markaudio Alpair 7MS. A subjective and objective comparison.
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Old 25th May 2019, 12:28 AM   #1
Dr1v3n is offline Dr1v3n  United States
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Location: Wake Forest, NC
Default Markaudio Pluvia 7 vs Markaudio Alpair 7MS. A subjective and objective comparison.

Markaudio Pluvia 7 spec's HERE
Markaudio Alpair 7MS spec's HERE

The intent of this thread is to compare both drivers in nearly identical conditions within my testbed. Spec's soon.
The 7MS is a new purchase, so has less than 100 hours of low volume use. The P7's have undergone break-in and have undergone stressful use. More on that later...

More importantly, the 7MS is a mono-suspension driver. There is no spider fighting the cone and cancelling frequencies. Also, the cone and basket are designed to improve off axis frequency response. I will, to the best of my ability, analyze that how these small details affect the frequency response. Also, most off axis response curves are missing from Markaudio datasheets so at least some data will be present there.

The test gear:
1) Dayton USB EMM-6 Calibrated Mic.
2) Behringer U-Phoria UM2 USB preamp with 48V phantom power.
3) 19-in 1U rackmount Win10 running REW, custom made with BlueTooth keyboard and HDMI output to smartTV. Optical/SPDIF output to DEQ2496 digital EQ which outputs RCA to the AudioSource Amp3.
4) 1x AudioSource Amp3 150W per channel for power.
5) 5ft tripod to hold the Dayton emm-6.
Attached Images
File Type: jpg Digital Test Gear.jpg (874.8 KB, 837 views)
File Type: jpg Dayton_UMM-6.jpg (166.3 KB, 839 views)
File Type: jpg Behringer UM-2.jpg (130.4 KB, 823 views)
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Old 25th May 2019, 06:20 AM   #2
zman01 is offline zman01  Bangladesh
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Markaudio Pluvia 7 vs Markaudio Alpair 7MS. A subjective and objective comparison.
Dr1v3n,

Look forward to you findings, and thank you for undertaking this objective comparison.
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Old 25th May 2019, 07:04 AM   #3
orangeart is offline orangeart  United Kingdom
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Have you got a boom arm for the tripod? I find such a bulky mechanism to hold a mic causes some squiggly bits in the reading. I normally hang mine from fishing wire which means I can get the mic stand stuff out of the picture a bit more. Looking forward to seeing the off axis, I've never been able to do it well enough to have repeatable results. Some sort of turntable with the acoustic centre marked would be best I suppose but then if I was going to those lengths I'd not be happy with domestic gated measurements either.
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Old 25th May 2019, 08:24 AM   #4
TimbreAudio is offline TimbreAudio  United Kingdom
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Old 25th May 2019, 08:57 PM   #5
freddi is offline freddi  United States
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outdoors (if noise and wind/weather permit) works well. A plastic turntable marked 0-15-30-45 degrees is cheap/repeatable. (I've moved the mic in an arc before)

with my Karlson stuff, the mic could not alone discern much with aperture changes - probably due to a large source and perhaps varying time arrivals which can be easily heard but not seen/"understood" in a single mic point. Your little direct radiator should be easier in that regard. Your report will be interesting.
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Old 25th May 2019, 09:57 PM   #6
Dr1v3n is offline Dr1v3n  United States
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I'll try to be as objective as possible, but I'm afraid it will be nowhere anechoic. I have vinyl floors and a relatively small 15ft x 20ft listening room. Consider everything I post an 'approximation'. It's one reason I added 'subjective' to the title...

For the 0deg FR measurement, my technique will be placing the tip of the mic 1 meter direct and level in front of each driver cone and double check the SPL with a calibrated mic plugged into my cell phone using an App. Once it reads 86dB, I should be close to 1Watt. I'm assuming the Markaudio datasheets are correct.

Here's a couple pics of the 2 drivers side by side. You can see how much more shallow the 7MS cone AND basket is compared to the P7 on the right. Also, the basket style is different. I tried to focus on the voice coils too, sorry for the brightness levels.
Attached Images
File Type: jpg 60deg.jpg (579.0 KB, 747 views)
File Type: jpg 80deg.jpg (596.8 KB, 736 views)

Last edited by Dr1v3n; 25th May 2019 at 10:13 PM.
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Old 25th May 2019, 10:25 PM   #7
Dr1v3n is offline Dr1v3n  United States
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Here's a few pics of the enclosures I'm using. They're .1cuft or ~3litres. The rolloff should start at about 150Hz for the P7's. Not sure of the rolloff of the 7MS's? Had a real long day at work... FR measurements will start tomorrow!

Also, the wiring I use is 8 strands of cat5E solid cable with insulation and about 14" long tightly crimped to spade connectors. Spade connectors are very tightly connected to the driver connectors.
The stuffing is very loose fiberglass used in the housing industry.
Attached Images
File Type: jpg Bare enclosure with wires.jpg (948.6 KB, 203 views)
File Type: jpg Bare enclosure with loose fiberglass.jpg (998.3 KB, 155 views)
File Type: jpg Stuffed enclosure.jpg (985.4 KB, 157 views)
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Old 25th May 2019, 11:42 PM   #8
CraigSu is offline CraigSu  United States
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Assuming 24 AWG per strand (and it is an assumption since network cable can be 22-28 AWG) 8 strands equals 15 AWG. Experience by planet10 and Chrisb show that’s way more than you need for Mark Audio drivers. I believe they recommend a single 22 AWG strand but they can confirm that.
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Old 25th May 2019, 11:57 PM   #9
Dr1v3n is offline Dr1v3n  United States
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Each strand is .030" with isulation. .018" without. I chose solid and insulated to avoid inductance, although for a 14" length it's probably very negligible. Plus I had the 1000ft Cat5E spool lying around, so I thought it was a wise use of inventory.
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Old 26th May 2019, 12:26 AM   #10
CraigSu is offline CraigSu  United States
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Believe me, I’m not denigrating your choice. I also use network cable but braiding, twisting, and crimping/soldering 8 strands of solid core can be tedious, especially if you’re building line arrays.
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