Looking for a Voigt plan for the Alpair 10.3 - Can you help?

[TylerDurden]

After building a set of Pensils a few years ago I fancy trying my drivers in another enclosure.
Does anyone have a plan I can follow?

Thanks

 

[Scottmoose]

Like this?

Alignment is similar to the pensils.

http://wodendesign.com/downloads/Samhain-ML-V-0v83-200519.pdf

3/4” and 18mm plans. Snapshot attached is 18mm plan (thee are metric & imperial versions — do check the actual size of your material and adjust before cutting)

 

[TylerDurden]

Perfect. Thanks very much.
How are they likely to compare sonically?

 

[TylerDurden]

Also, the plan stipulates a slot vent 1.75" tall the 0.75" long. I thought the slot vents were full width, so 8". What does the plan mean? Sorry if that's a silly question.

 

[Scottmoose]

It means the slot vent is 1.75in tall, 0.75in long (front-rear i.e. build material thickness) and the full internal width. I can't say in sound terms other than noting the alignments are similar, with a slightly broader gain BW for the ML-horn. There won't be much in it in terms of output or driver excursion, and the impedance for both is quite flat, making them largely resistive / unreactive loads for the amplifier.

 

[freddi]

fwiw, I tried to sim it in Hornresp:

https://i.imgur.com/DWYMdZ1.png

 

[freddi]

BIG OOPS on my sim above - wondered why spl was so high - til saw "2P" for drivers - - will do again

here it is mostly right

 

[DrBoar]

Less roomdominating and I had a pair that gave response to 40 Hz.
With a constriction of the opening it might go even lower.
http://www.speakerbuilding.com/content/1031/voight_d.gif

 

[Scottmoose]

From my POV (and I accept there are others) when an MLTL is a viable option for a given drive unit and can achieve a similar alignment with it to an ML-horn / ML-Voigt, then the primary value of the latter is aesthetic rather than functional. The appearance of the tall triangular pipe is more or less the raison d'etre in these particular cases. The slightly broader gain BW provides a little extra loading for the driver so there are some differences in behaviour / character, but if you want a dramatic change you really need to shift to something closer to full horn loading, either a pipe-horn like the BIB or a chambered type. The above (like the pensils) is not designed for maximum extension; there are already designs that target that. I could lower Fb by increasing the forcing, but I didn't want to here; it's got quite a nice balance.

 

[TylerDurden]

Thanks for the input from everyone. (I'm off to find out what all the acronyms mean!

 

[TylerDurden]

Less roomdominating and I had a pair that gave response to 40 Hz.
With a constriction of the opening it might go even lower.
http://www.speakerbuilding.com/content/1031/voight_d.gif

Is this specifically for the Alpair 10.3? And it appears as though the opening is upward facing. Is that right?

 

[Octavia]

And being upward facing does it somehow use the wall behind as boundary reinforcement?

 

[planet10]

Plans in Post #2 updated.

dave

 

[zman01]

Going OT with this post, but was there a ML-Voigt for the Alpair 12 called the Solstice?

 

[planet10]

Very very briefly before it was withdrawn. Not because it didn’t work.

With this you are seeing the revival of the Festival series.

dave

 

[zman01]

Very very briefly before it was withdrawn. Not because it didn’t work.

Has anybody built a Solstice?

 

[planet10]

One pair of the original Festival Series was built by a fellow in Europe… not sure which one. That was a long time ago.

dave

 

[zman01]

Noted Dave.

Look forward to some build updates from the current crop of interested DIYers.

It's an interesting aesthetic.

 

[chrisb]

If you mount the driver on the sloped panel, you’ll end up with something similar to the late Terry Cain’s Abby’s - minus of course the large lathe turned supra-baffle.

 

[GM]

Plans in Post #2 updated.

dave