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Old 5th April 2011, 07:02 PM   #21
M Gregg is offline M Gregg  United Kingdom
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I know that porting will effect position of the speaker,

However what method do you think is most efficient to transfer bass to the listener?

Not using a sub!

It's interesting you mention mass loading some time ago I had some Tannoy speakers, these could have sand put in the bottom to mass load. So thinking this would be better I filled the bottom with sand. All the bass seemed to disappear! So the sand came out!

Will Mark Audio ship Alpair7 to the UK?


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M. Gregg
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Old 5th April 2011, 07:19 PM   #22
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If you sand fill a speaker, it is done in a unused cabity of the lougspeaker. This aids stability by lowering the centre of mass. If you put sand into the speaker volume, you will decrease bass because you are reducing the cabinet volume (and if ported screw up the tuning.

In UK, you get A7 from Blue Planet (they recently cleaned Mark out (ie he has none) or if they have any left Alium Audio) Matched & modified from that planet10 guy (as in the picture attached earlier).

dave
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Old 5th April 2011, 07:53 PM   #23
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by planet10 View Post
If you sand fill a speaker, it is done in a unused cabity of the lougspeaker. This aids stability by lowering the centre of mass. If you put sand into the speaker volume, you will decrease bass because you are reducing the cabinet volume (and if ported screw up the tuning.

In UK, you get A7 from Blue Planet (they recently cleaned Mark out (ie he has none) or if they have any left Alium Audio) Matched & modified from that planet10 guy (as in the picture attached earlier).

dave
This was in a cavity in the base designed for loading "closed partition". Perhaps it was just tighter, however it seemed less.

Thank's for the links!

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M. Gregg
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Old 5th April 2011, 08:59 PM   #24
M Gregg is offline M Gregg  United Kingdom
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Sorry back again,

What are your thoughts on covering the inside or back panel with sorbothane sheet?


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Old 5th April 2011, 09:15 PM   #25
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To what end? It is not as good at damping as the specified wool felt, and adds mass to the panel without adding stiffness.

Now putting a layer of sorbathane (or some sort of feet) between the "stand" and the bottom of the speaker may have benefit.

dave
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Old 6th April 2011, 11:57 PM   #26
wagtail is offline wagtail  Ireland
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alpair 7's stocked here Europe Audio - Home page got mine from them good service reasonable delivery charges,
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Old 7th April 2011, 09:07 AM   #27
M Gregg is offline M Gregg  United Kingdom
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alpair 7's stocked here Europe Audio - Home page got mine from them good service reasonable delivery charges,
simon
Thank's for the link.

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Old 12th April 2011, 07:32 PM   #28
M Gregg is offline M Gregg  United Kingdom
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Just for info,

I have ordered the Alpair 7's in gold.
Should be interesting!

I'll take a look at the box build!


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Old 12th April 2011, 07:42 PM   #29
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Quote:
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Alpair 7's in gold.
Should be interesting!
It is called gold, but it is really copper....

A6.1 in gold

Click the image to open in full size.

A7 in gold/copper

Click the image to open in full size.

All the colours have their appeal

And it matters little with your eyes closed and your foot a-tappin'

dave
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Old 15th April 2011, 11:52 PM   #30
M Gregg is offline M Gregg  United Kingdom
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Just for info!

I received the Alpair 7's today.
I decided to use 18mm Birch ply for the box, 15mm is quoted.
The volume of the box remains the same as quoted in the plans!

I have cut the ply to size and used wood strip to cover the ends.
Let you know how it goes!

Any thoughts on speaker cable used inside the box.

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M. Gregg
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