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Old 22nd August 2011, 10:00 PM   #131
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Quote:
Originally Posted by shortwave View Post
Wow, those are nice. I am considering the pencils and thanks for the tip on the mitered joints as I am looking at the same ply you made yours out of and was thinking I was going to have to clue on a solid wood trim edge. What type of joint or means of securing them did you use? Thanks
Some build pics are a page or two back in this thread. Mitred joints for all the sides, then butt join for putting the front on. Wood glue was used all around, no nails or screws...except for the back panel which is removable.

You've got to be very careful with the plywood as it comes with a very thin veneer that can easily chip. I cut the pieces to the outer dimensions then mitered them afterward. Use scrap wood beforehand to make sure the table saw is set precisely. I had a few chips but I filled them with stainable wood putty. I could point out the spots to the average viewer, but standing a food a way you wouldn't notice. My woodworking skills on a scale of 1 to 10 are about a 6 or 7...but I know enough about hiding mistakes that the final product is passable.
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Old 23rd August 2011, 09:18 AM   #132
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Default Pensil 12 Austria

Greets from Austria!
Pensil 12

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Old 23rd August 2011, 03:16 PM   #133
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Very nice. I particularly like the wood tone contrast. Are you using four spikes or three?
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Old 23rd August 2011, 03:45 PM   #134
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Originally Posted by buzzforb View Post
F5 should have no problem. I am using AJ on 10.2 with plenty of power to spare.
Alpair 7 is the 4" fullrange driver with 20w nominal power. Are you sure they can handle the 25w / side.
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Old 28th August 2011, 04:39 PM   #135
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Originally Posted by chrisb View Post
chuyler - play with getting them as far out from the corners boundaries as much as can - with the driver's BSC compensation and the excellent performance of Scott's design, these will likely need far less "help" than you're used to.

I'd be vewy vewy careful with spikes on the carpet - after damaging both deep pile carpet (mine) and edge-grain solid fir floor ( Dave's) I've long since eschewed spikes altogether in favour of granite slabs on carpets and felt slider pads on vinyl/laminate and hardwood floors.

nice work, and now just enjoy the damned things
(This is probably a bit off-topic, but here we go anyway....)

Proper room placement can reinforce bass particularly in the very low regions. Allen Perkins has an interesting paper (re-penned by Joachim Gerhard in 2009) on speaker placement that I think applies very well to single-driver systems. I have not spoken with either Allen or Joachim regarding changes to Allen's original work.

http://www.immediasound.com/Speaker%20set-up%202009.pdf

This might not be the end-all / do-all for speaker set-up, but it might be worth a try or even a starting point for some. In my experimenting, the soundstage and imaging improved by moving away from the back wall a bit, but the boundary effect bass was reduced. It made for an interesting experiment in system performance tuning. YMMV.

Last edited by silverhairbp; 28th August 2011 at 04:41 PM. Reason: rationale
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Old 28th August 2011, 04:56 PM   #136
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Originally Posted by merlin2069er View Post
Alpair 7 is the 4" fullrange driver with 20w nominal power. Are you sure they can handle the 25w / side.
Just because an amp can provide a certain level of power, does not mean it will ever have to do so. IF you want 20W nominal, try this variation.

F5 with 2SK2013/2SJ313

Last edited by buzzforb; 28th August 2011 at 05:05 PM.
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Old 28th August 2011, 05:22 PM   #137
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Originally Posted by merlin2069er View Post
Alpair 7 is the 4" fullrange driver with 20w nominal power. Are you sure they can handle the 25w / side.
I use a pair of Herron M-150 mono amps on a pair of bipole CAA FR125SRs (that's 150 watts on each speaker). It's not the amount of power that's available, it's how its applied and the frequency used. 5 watts at 500hz is a lot different than 2 watts at 20hz.
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Old 28th August 2011, 11:09 PM   #138
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Originally Posted by silverhairbp View Post
I use a pair of Herron M-150 mono amps on a pair of bipole CAA FR125SRs (that's 150 watts on each speaker). It's not the amount of power that's available, it's how its applied and the frequency used. 5 watts at 500hz is a lot different than 2 watts at 20hz.
That's CSS FR125SRs, not CAA. Sary abuot teh tyepo.
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Old 31st August 2011, 01:24 AM   #139
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Hi Guys,
I've made a new thread re measurements as the topic is interesting. Keeping this thread mostly for "pics".

Please feel free to go to this thread to follow up on test experiments on Chuyler's project and measurement contributions:

Measuring speakers in-room. Practical considerations.

Please let me know if any member wishes to have their posts migrated.

Thanks
Mark.
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Old 1st September 2011, 06:47 PM   #140
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In the Alpair 7 thread it is noted that driver height is important in the cabinet design. Would it then be unreasonable to expect a Pensil 10.2 cabinet with the same internal volume and vent dimensions to perform less successfully if it were taller but less deep?

The reason I ask is that, like to individual making comment on the Alpair 7 thread, I prefer a driver that is quite a bit higher than the various Pensil designs call for. My personal preference is for midrange drivers to be between ~ 40" / 1 meter and 50" / 1.25 meters above the floor.
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