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Old 19th September 2015, 06:13 PM   #1
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Default MarkAudio 12P and 12PW question

Do either of these drivers exhibit any cone break-up of other nasty anomalies? I'm particularly interested in running them as wide-band midranges. I had a terrible time with metal cone 10.2's and 10.3's.

Bill
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Old 19th September 2015, 07:42 PM   #2
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The 12p has a distortion peek around 500hz that doesn't seem to be a significant problem when running "full range". Don't know about the woofers. What were the issues with the 10's?

jeff
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Old 19th September 2015, 08:44 PM   #3
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Jeff,

The 10.X models had awful cone break-up, particularly on brass instruments. Completely unlistenable. And that was AFTER over 300 hours of slow, gentle breakin. I sent back the 10.2 drivers but thought that just maybe it would be different with the 10.3 model. Wrong. It was actually worse. (Fool me once, shame on you. Fool me twice.... I'll do what I can to prevent a third time.)

Would like to try the 12P or 12PW, but don't want to waste more money on a driver that has cone break-up. Again.

By "distortion peak" do you mean cone break-up?

BTW, never had a problem with the 7.3's.

Bill
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Old 19th September 2015, 09:11 PM   #4
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Quote:
Originally Posted by silverhairbp View Post
By "distortion peak" do you mean cone break-up?
I guess you could call it that. When the cone is producing harmonic content at a certain frequency that isn't in the signal being fed to it.

Were the 10's running full range? What is your implementation, as mids?

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Originally Posted by silverhairbp View Post
BTW, never had a problem with the 7.3's.
Horns generally sound pretty good with the A7's.

jeff
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Old 19th September 2015, 11:54 PM   #5
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Jeff,

The 10.X's were running full range. The 10.2 pair was running in 10.2 Pensils. The 10.3 in 10.3 Pensils.

Yes, the A7.3s in Pensils are pretty decent. For the cost of a pair of drivers and a sheet of 3/4" Baltic Birch, it's possible to construct a very nice pair of speakers that most people could live with. At least live with if they don't push them too hard.

I have a design for a large system that uses CSS FR125SR full range drivers as mids. I was able to get a few pairs when they went out of production. But I am selling the last pair of speakers that use those drivers and there are no more FR125SR's available. So I'm looking for a better driver as a substitute.
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Old 20th September 2015, 09:13 AM   #6
zman01 is offline zman01  Bangladesh
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Hi Bill,

Here's a project where a diyA member has done a 2 way with Alp 10.2:

Ben's "Hi-Marks" Fullranger + Isodynamic Tweeter 2-Way Build Thread

Read that these are pretty good as mid/mid-woofs:

Creative Sound - Product Details

Last edited by zman01; 20th September 2015 at 09:19 AM.
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Old 20th September 2015, 03:49 PM   #7
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Zman - Thnx for the CSS link. Been looking at that for a little while, hoping Bob will eventually post the frequency response graph for the raw driver.

I won't touch another Alpair 10 m driver. Cone breakup in the two different pairs I bought (10.2 and 10.3) was unacceptable.
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Old 20th September 2015, 06:46 PM   #8
chrisb is offline chrisb  Canada
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Indeed the new CSS driver could be thought of as a direct descendant of the FR125- we built a very successful MTM BLH with them and a low cost buy-out tweeter- also from Bob-a year or so ago. As those enclosures where essentially a stacked/inverted pair of FH3, they weren't particularly compact
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Last edited by chrisb; 20th September 2015 at 06:48 PM.
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Old 20th September 2015, 07:40 PM   #9
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Quote:
Originally Posted by silverhairbp View Post
I won't touch another Alpair 10 m driver. Cone breakup in the two different pairs I bought (10.2 and 10.3) was unacceptable.
Go 2-way then. A7.3 + 12PW.

jeff
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Old 20th September 2015, 07:59 PM   #10
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Quote:
Originally Posted by chrisb View Post
and a low cost buy-out tweeter...
I'd hardly call them that. Bob's 1st 1" XBL tweeter, i think they retailed for near $100 each.

dave
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