Illegitimate Son of Pensil - Alpair 10.2

buzzforb · 12:16 PM

Alpair 10.2 should be here Tuesday so it is time to start a build thread. As many on this forum do, I would like to put my signature on this project. Before starting, I have some questions to help guide me in the design. Hopefully with others help, I can create something unique. First question concerns the original Pensil design. Is this considered an MLTL? Would changing the box shape affect the rsponse as long as volume is kept consistent? Considering changing side view shape into something with curved line.

Can I break in the 10.2's using appr sized cardboard box, closed at first then cutting a hole to simulate BR?

Scottmoose · 29th January 2011, 01:13 PM

You could have asked me.

It's a specific alignment that's essentially a hybrid of different loads. The dimensions are functional, so if you alter them, you're on your own, as you will have moved away from the original design remit & behaviour.

buzzforb · 29th January 2011, 01:18 PM

Quote:

Originally Posted by Scottmoose

You could have asked me.

It's a specific alignment that's essentially a hybrid of different loads. The dimensions are functional, so if you alter them, you're on your own, as you will have moved away from the original design remit & behaviour.

I was hoping you would respond when I started this thread. I am ignorant and will rely heavily on yours and others advice. Of course it could't be simple

. How would beveling the baffle affect response. I would assume it would help with baffle diffraction, but I am unsure of other subtleties.

Scottmoose · 29th January 2011, 01:23 PM

You can certainly bevel / round over the edges of the baffle. How much sonic difference it makes when wideband drivers (even those with relatively wide dispersion like the MA units) are employed is debatable, but it does look pretty.

buzzforb · 29th January 2011, 02:23 PM

My eventual hope is to use the 10.2 in a FAST type speaker. I am very interested in the Devore lineup, specifically his bass setup on the silverbacks. Do you or any one else have any ideas about what's going on in there. From the description, it seems that the two holes you see are ports.

Scottmoose · 29th January 2011, 03:14 PM

Link?

buzzforb · 29th January 2011, 08:25 PM

Interesting description of what is going on in the speaker in this review. I know the drivers are not connected to the outside box.

DeVore Fidelity Silverback Reference loudspeaker | Stereophile.com

Scottmoose · 29th January 2011, 10:45 PM

You mean low down on the back? Looks to be a fancy double-bass reflex to me, with each of the side-firing drivers being in its own chamber venting into a 2nd (also independent) lower chamber, which finally vents into the room.

buzzforb · 29th January 2011, 11:37 PM

You mean out the side?

Scottmoose · 07:54 AM

It doesn't have any side-firing vents; just the grills over the 8in bass units. The two vents are on the back of the cabinet, near the floor.

29th January 2011, 12:14 PM	#1
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Illegitimate Son of Pensil - Alpair 10.2 Alpair 10.2 should be here Tuesday so it is time to start a build thread. As many on this forum do, I would like to put my signature on this project. Before starting, I have some questions to help guide me in the design. Hopefully with others help, I can create something unique. First question concerns the original Pensil design. Is this considered an MLTL? Would changing the box shape affect the rsponse as long as volume is kept consistent? Considering changing side view shape into something with curved line. Can I break in the 10.2's using appr sized cardboard box, closed at first then cutting a hole to simulate BR? Last edited by buzzforb; 29th January 2011 at 12:16 PM.

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29th January 2011, 01:13 PM	#2
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	You could have asked me. It's a specific alignment that's essentially a hybrid of different loads. The dimensions are functional, so if you alter them, you're on your own, as you will have moved away from the original design remit & behaviour.

29th January 2011, 01:23 PM	#4
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	You can certainly bevel / round over the edges of the baffle. How much sonic difference it makes when wideband drivers (even those with relatively wide dispersion like the MA units) are employed is debatable, but it does look pretty.

29th January 2011, 02:23 PM	#5
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	My eventual hope is to use the 10.2 in a FAST type speaker. I am very interested in the Devore lineup, specifically his bass setup on the silverbacks. Do you or any one else have any ideas about what's going on in there. From the description, it seems that the two holes you see are ports.

29th January 2011, 03:14 PM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Link?

29th January 2011, 08:25 PM	#7
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Interesting description of what is going on in the speaker in this review. I know the drivers are not connected to the outside box. DeVore Fidelity Silverback Reference loudspeaker \| Stereophile.com

29th January 2011, 10:45 PM	#8
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	You mean low down on the back? Looks to be a fancy double-bass reflex to me, with each of the side-firing drivers being in its own chamber venting into a 2nd (also independent) lower chamber, which finally vents into the room.

29th January 2011, 11:37 PM	#9
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	You mean out the side?