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Old 19th August 2014, 08:06 PM   #11
chrisb is offline chrisb  Canada
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too funny - I even posted my own preference for the graphite at the time, but hey, that was over 2 yrs ago, and since my own ended up in white, I just assumed
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Old 20th August 2014, 04:42 AM   #12
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This is awesome. Very excited to start seeing designs with the 12WP/7P combo.
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Old 21st August 2014, 02:15 AM   #13
nirvana is offline nirvana  Canada
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Quote:
Originally Posted by Scottmoose View Post
Q & Vas are moderate, so the driver wants a larger volume than many similarly sized units. 45 litres tuned to 33Hz should do a nice job, with a lightly damped alignment.
It will be hard to resist to built a 7p-12pw kit...
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Old 25th August 2014, 01:01 PM   #14
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quick question

The Revc is 5.4 ohms whereas the chart shows the lowest impedance point at around 8.5 ohms I think. Usually i don't see this wide a difference

Any implications for running 2 in parallel?
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Old 25th August 2014, 11:57 PM   #15
BYRTT is offline BYRTT  Denmark
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Quote:
Originally Posted by Bill poster View Post
quick question

The Revc is 5.4 ohms whereas the chart shows the lowest impedance point at around 8.5 ohms I think. Usually i don't see this wide a difference.....
You right it looks high on plot, exact same thing asked and anwered by markaudio at 7P thread, here link: ALPAIR 7P - launch - specs

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Originally Posted by Bill poster View Post
.....Any implications for running 2 in parallel?
Audio band AC impedance is nice high so should be fine, else some guess:
If amp classified loads 4 ohm or less at same not too exotic speaker cables and amp commercial, don't think so.
If amp classified loads 4 ohm or less but a diy amp with exotic/normal speaker cables, sometimes loads can make weird things to happen at amp, there is tools as zobel network and RL filter build into amp box used to do the job.
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Old 26th August 2014, 04:53 AM   #16
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Hi Guys,
Yes, as per the other thread and from previous discussions, expect some variance between plots and T/S data. Temperature, humidity and similar environmental conditions can't entirely be eliminated from anechoic testing. T/S testing is a separate function from sweep tests, so its the quirks of the hardware/software when it comes to outputting the results.

I could follow other makers and move the impedance sweep data trace position on the graph, but I get nervous making any significant changes to data presentation.

Use the T/S data for your design work. Levc, Revc, SPL, Fo (etc) is data that will guide you to integrate the driver(s) into your box design.

Use frequency, impedance, waterfall and similar plots to make a "overall" judgment about the suitability of a driver for your future projects.


Thanks
Mark.
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Old 30th August 2014, 09:55 AM   #17
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I am really happy with the metal 7's and 10's and would love a woofer to blend into a box, will we see a black iteration as with the MAOP's?
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Old 7th September 2014, 08:07 AM   #18
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Quite surprised by the madisound price, pleasantly so. Wasn't sure where it would be set, due to the existing A12
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Old 24th October 2014, 10:08 PM   #19
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Any pics of the these woofers with metal coned Alpair's?

I would love to build a 'sub' cabinet on which to test other speaker designs.

Although these have been designs to work very well with the 7p there is no glaring reason why they wouldn't be fine with other speakers? (Metal Alpairs or horns?)
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