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-   -   Alpair 12 Open Baffle Designs (http://www.diyaudio.com/forums/full-range/162529-alpair-12-open-baffle-designs.html)

hayenc 3rd March 2010 12:24 AM

I posted a while back on the Goldwood's with the Jim Griffin Jordan/AC design on top. Very nice and matches well. Not currently listening to them as I went to the 15" Eminence (actually now the Selenium) with the Alpair 12 on top. More sensitive and a bit more detail. My power amp went out when I switched to the Seleniums, so have not had time to do a real comparison with the Eminence since I am using a spare amp for now, but will say more later.

MJK 3rd March 2010 12:32 AM

I have started, not really intentionally, a collection of 15" woofers and a bunch of 3" to 4" full range drivers (Alpair and Fostex mostly) that could be mixed and matched to find good combinations. A modular OB that can take the different driver combinations may be my next build.

The older Alpair drivers I have model really well in an OB. I have looked at the new Alpair 7 and 12 and they also look good. What are your impressions of the Alpair 12 compared to the Jordan you also have heard? The big Alpair is an interesting looking driver.

hayenc 3rd March 2010 12:42 AM

I have both the Alpair 7 and the 12. The most important thing I have learned is to believe what Mark says about them needing over 200 hours to break in. At first, I preferred the 7's over the 12's as the 12's actually seemed a bit bright. Now that they are broken in, the 7's seem a bit thin and the 12's sound awesome.

Not a scientific measurement, just an opinion, the 12's sound a bit more detailed and a bit fuller than the Jordan's. However, again, I look forward to having my AR amp back and having time to do some serious comparisons. That means building an OB for the Jordan's so I am really comparing OB to OB instead of to the Jim Griffin design. Bottom line is that I have no regrets about buying the Alpairs once they broke in.

You can see pictures at AZDIY2009 Detail Photos

Craig

MJK 3rd March 2010 01:12 AM

Thanks for the picture link. The speaker look great. I'll have to think about adding the Alpair 7 and 12 to my collection

_henry_ 3rd March 2010 01:32 AM

Very nice, wish i was there.

The baffle for Alpair 12 is smaller than original MJK design for Jordan's. Any reason for the change?

cheers
Henry

hayenc 3rd March 2010 02:10 AM

Quote:

Originally Posted by _henry_ (Post 2105102)
Very nice, wish i was there.

The baffle for Alpair 12 is smaller than original MJK design for Jordan's. Any reason for the change?

cheers
Henry

Available wood. I threw them together in a hurry. Interesting you should ask as I have since added 4 inches on one (out) side and 3 inches on the other (in) side of the Alpair 12 OB with an increase in detail. Don't know for sure if it was adding width or just the break in, but the added width did seem to help.

_henry_ 3rd March 2010 02:28 AM

Interesting, maybe the highs drop down so u can hear more detail in mid freq.

I have Alpair 10FR in GM's ML-TL (slightly undersize), and Alpair 10 bass + Alpair 5 waiting to have a house.

I saw this thread 2months ago, which was very intersting, since i always want a clean low bass.

Im trying to figure out which woofer can do. So far the available would be PA audio from thailand which have qts about 0.7

Cheers
henry

albertli 3rd March 2010 03:06 AM

1 Attachment(s)
Quote:

Originally Posted by hayenc (Post 2105040)
I have both the Alpair 7 and the 12. The most important thing I have learned is to believe what Mark says about them needing over 200 hours to break in. At first, I preferred the 7's over the 12's as the 12's actually seemed a bit bright. Now that they are broken in, the 7's seem a bit thin and the 12's sound awesome.

Not a scientific measurement, just an opinion, the 12's sound a bit more detailed and a bit fuller than the Jordan's. However, again, I look forward to having my AR amp back and having time to do some serious comparisons. That means building an OB for the Jordan's so I am really comparing OB to OB instead of to the Jim Griffin design. Bottom line is that I have no regrets about buying the Alpairs once they broke in.

You can see pictures at AZDIY2009 Detail Photos

Craig


I totally agree as my Alpair 12 has over 300 hours on and I love them more and more. I could never imagine it sounds so sweet and rich. I suppose to have my report submitted after 300 hours as promised, but I forgot to start writing anything when the system is on. What I need now is a little bit more air at the top.

fakamada 3rd March 2010 06:25 PM

albertli :

Very nicely shaped top baffles.

Godzilla 3rd March 2010 08:29 PM

albertli, funny to see your Goldwood H-frames with OB Alpairs. I have Alpha H-frames with (at the moment anyway) Tangband w8-1808s... i also have unused BIBs but behind the listening spot. If you ever go back to the BIBs you will see they do have compelling qualities too. But currently I am enjoying these relatively modest costing open baffle systems that really cost very little in comparison to the electronics used to power them. I also agree, your pleasantly shaped baffles have a nice organic look compared to the rigidly angular rectangles that adorn my room. Enjoy!

Godzilla


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