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Old 6th September 2013, 12:10 PM   #11
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I look forward to hearing your thoughts on the FH3's, George! That's a great looking design (with high WAF) and the feedback I've read has been very good. If the cabinet weren't so complex, I'd have built a pair already; and I can't bring myself to spend the money on a flat pack of 'just cut wood'. I think a rather poorly constructed set is in my future at some point. The EZ-10s suffered a fate that is all too well known in our household (hence the SSE build to replace my Rotel/Adcom separates).

Zman, can you compare the efficiency of the 12p to say the 7.3 in similar designs (maybe you've heard both in pensils)? I know what it says on paper, but I'd be interested in subjective opinions, too. Much of this build is motivated by the goal of more efficient speakers (along with the good things I've heard about the single-ended and full-range combo).

Edit: You know what? That Bob Brines 12p enclosure isn't even that big...

Last edited by Sodacose; 6th September 2013 at 12:13 PM.
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Old 6th September 2013, 08:10 PM   #12
zman01 is offline zman01  Bangladesh
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Sodacase,

I have heard the Alp 7.3 in P10 Mar-Ken enclosures and the FH Mk3 - and the A12P in a couple of MLTL designs - so similar enclosures it would not be. The A12P is a bigger driver and has around ~6dB SPL over the Alpair 7.3 IIRC - so that would make it quite a bit more louder with the same amplification. I also recall diyAudio member Vinylkid58 has both the Alp 7 and the Alp12P - maybe he can share a few words.
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Old 6th September 2013, 09:58 PM   #13
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Not sure if I'm going to me much help, but I'll give it a shot. I don't own any single ended amps at present, although I've heard a few with different Fostex and Mark Audio based speakers, either here or over at Chrisb's house, and also up at Dave's (Planet_10).

Any of the Alpair 7 based speakers play quite nicely with lower powered tube amps, either SET, or Single Ended pentode amps running UL/Triode modes. This would be for "easy" casual listening in small/medium rooms, where loud dynamic swings are not expected. With more power on tap, A7's will play fairly loud, but don't have the "impact" in the lower mids/upper bass that the bigger drivers have. Obviously this is very subjective, as everyone has/have different listening rooms and preferences.

Alpair 12p drivers are much better suited to SET/SEP tube amps IMHO. They will play quite well with 2A3 SET for example, and will scare you with 20 watts. The only downside is enclosure size, unless you go with a MarKen/BR "stand mount" box with powered subs.

jeff
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Old 7th September 2013, 06:24 AM   #14
chrisb is offline chrisb  Canada
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In addition to the substantial difference in sensitivity between the 12P and 7.3, there's quite a difference in tonality & texture in the upper mid to top end of treble range.

I've been notoriously yapping on about my preference for the 2 versions of the Alpair 7 I've own/heard over the past several years, but as Jeff alluded they have some downsides when used with "flea-watt" SE amps - the aforementioned sensitivity, and higher bass roll off than with the 12s is full sized enclosures.

Well bless his heart, but after a lot of R & D Mark Fenlon has recently released 2 new versions of a "Goldilocks" driver - the 10.3 metal and 10P (paper). I've heard both in different enclosures, so a direct comparison's not yet been practical, but in a "larger version" of the FrugelHorn ( FHXL) the 10P just might be my new favorite. Unfortunately that enclosure doesn't quite suit the feng shui of the rooms in which my 2 separate systems reside - well for now

Anyways, at just under 90dB sensitivity they won't break windows or leases with 5-8watts, but I think they're too refined and detailed for such rough trade anyways. Of course, I'm and old fart who listens to mostly Jazz and Blues, so YMMV
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Old 7th September 2013, 01:20 PM   #15
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Based on what you are all saying, I think I'll go with one of the larger drivers.

The 10p does indeed look very promising, and its Pensil enclosure is fairly petite to boot (it is almost exactly the same size as the bookshelf speakers on their stands that it would replace). The only thing that gives me pause is the bass.

I'd not like to run a subwoofer, and I don't listen to much bass-heavy music (mostly jazz, classic rock on vinyl), but my wife does have a penchant for modern pop (Lady Gaga, Pink, Katy Perry, etc). For her, bass is the reason one goes and builds a new set of speakers.

In your opinions, would the 10p in Pensils require a subwoofer for satisfying kick drums (upper 30's, lower 40's hz)? Would the 10.3 (88db sensitivity) provide more solid bass at the expense of sensitivity? These will be placed near the short wall of a 14' x 19' (~3.5m x ~6m) room for everyday usage.

Last edited by Sodacose; 7th September 2013 at 01:25 PM.
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