Alpair 6M Gen. 2 (metal) introduction

[_henry_]

hi dave,

thanks for looking into it. i think its perfect for desktop placement, considering the size. although might need to lower the mid and upper freq to compensate the bass as its going to be free standing (typical office desk not facing to the wall).

cheers
henry

[markaudio]

Originally Posted by EUVL

Mark (F),
1. Can we use our original AP6 BR enclosure without major changes (pipe length is not a problem) ?
Alpair 6 Bass Reflex Bookshelf
2. Would you let us (Mark L) do an A-B-C test against Gen1 & AP6 paper which we already tested and reported ?
Alpair 6 - Gen 2. - Prototype 1
PS Have not managed to talk to Jan yet, but have not forgotten.
Cheers,
Patrick

Hi Patrick, Mark L
Sure, should be OK for either 6P or 6M. The 6P is closer on specs to the old 6 so maybe a small tweak on the port length. On the 6M, there maybe more bass available so there could be an opportunity to extract a lower frequency cut off from the port. That means possibly adding some length to optimise the port, not sure if there's enough room inside the cab. All the same both Gen. 2 drivers should work out very nice.

Sure, feel free to feedback your ABC impressions. Did you read Kurt's and Henkjan's? They already noted the extra performance from the 6P.

THx for keeping Jan in mind.
Love this pic of your work! Ubber good looking desktop cabs, puts allot of pro systems to shame.

Cheers

Mark.

[EUVL]

Mark,

I punched the parameters in post#2 into an online vented box calculator and got an enclosure of 3.5 litres,
where as for Gen 1 the result is in line with our current design, around 6.3 litres.

Can that be true ? Where did I go wrong ?
Perhaps you could suggest a BR design ?


Cheers,
Patrick

[planet10]

Originally Posted by EUVL

I punched the parameters in post#2 into an online vented box calculator and got an enclosure of 3.5 litres,
where as for Gen 1 the result is in line with our current design, around 6.3 litres.

Patrick,

Last night i spent quite a bit of time workin on my miniOnkens for the A6.2.

I ended up with 3.6 litre for the A6M, larger enclosures did not get me the kinds a curves i like (ie i want a curve such that the 1st derivative has no "wiggles").

With the A6P, the standard 4.8 litre of the milliSize worked well. Anything larger enuff to make a difference to me did not.

I was surprised that both have almost identical response in a 2 litre microSize box.

dave

[EUVL]

Then I cannot use the AP6.2M in our BR enclosure. What a pity!!

They do look better in Gold than in gray.




Patrick

[planet10]

I you have the data (volume & port) for your enclosure i can do a sim. I expect we'll see a base shelf kind of alignment, which suits some people fine.

dave

[EUVL]

6.3 litre, 36mm dia., 110mm long.
Pipe length can go up to 150mm without too much problem.


Thx,
Patrick

[planet10]

Bass is a bit droopy, i avoid the bump up at the bottom that you see with the shorter port. If you have boxes handy it is worth a try.

I've see lots of designs that are worse (to my point of view) where people target extension over finesse.

A "half-a-brick" in the box to reduce volume likely wouldn't hurt. If you don't have easy access, a handful of glue encrusted small indian rubber balls would serve.

I assume you have a few of these (or at least significant investment in tooling)?

dave

[EUVL]

Thanks for the sims.

Yes, we have built quite a few, so no problem testing one.
In actual fact the very first prototype has been in Mark's factory for the last year or so.

But we probably want a stereo pair to make proper comparison.

Wonder what Mark has to say about the volume ??


Patrick

[EUVL]

This is the result of my BR enclosure calculation.


Patrick