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Old 13th January 2012, 06:03 PM   #1
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Default AN standard 8 bass reflex

I have bought a pair of Audio Nirvana Standard 8 drivers and a pair of Bicor 250 back loaded horn cabinets. The horns were intended for Lowther drivers, but they are told to work well with AN as well. They do, but are lacking in the bass range. The tiny Dayton Needles I built have much, much more bass than these huge speakers
IMG_0754.jpg
IMG_0757.jpg

Commonsense audio advises to use the AN's in bass reflex enclosures. Since I don't have a large house and the WAF of the huge horn cabinets is very low, I want to build a pair of new enclosures for these drivers.

I very much like the design of the 'Solo 103'. Would such a design with openings in top and bottom of the baffle be possible for an 8 inch fullrange driver? And could anybody with experience and design software help me?
Solo 103:
Solo 103.jpg
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Old 13th January 2012, 07:17 PM   #2
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by Bart-Jan View Post
I have bought a pair of Audio Nirvana Standard 8 drivers and a pair of Bicor 250 back loaded horn cabinets. The horns were intended for Lowther drivers, but they are told to work well with AN as well. They do, but are lacking in the bass range. The tiny Dayton Needles I built have much, much more bass than these huge speakers
Attachment 260136
Attachment 260137

Commonsense audio advises to use the AN's in bass reflex enclosures. Since I don't have a large house and the WAF of the huge horn cabinets is very low, I want to build a pair of new enclosures for these drivers.

I very much like the design of the 'Solo 103'. Would such a design with openings in top and bottom of the baffle be possible for an 8 inch fullrange driver? And could anybody with experience and design software help me?
Solo 103:
Attachment 260135

This format of multiple high aspect ratio slot ports can certainly work well (I've built a fair number along these lines over the past few years, with drivers up to 6.5" )

On taller enclosures, the port slots might end up configured along the sides,

Fostex FE167E / Fonken :

Click the image to open in full size.



or alternatively in an MLTL, as single slot at the bottom.

Mark Audio Alpair 12 SuperPensil

Click the image to open in full size.

If the manufacturer's published T/S parameters can be trusted, or if you have real world measures for your exact pair, there are folks here that'd likely be happy to calculate a design that could work better than the Bicors or a bog stock BR enclosure.

It might seem obvious that simply "adapting" a design proven to work for another driver to fit a different model / size of driver or for room/dimension constraints could be a wasted exercise - but things that "go without saying" , well, ask your wife about "I thought that was understood"
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Old 13th January 2012, 07:41 PM   #3
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Thanks for the quick reply!
Is it technically to have the slots on the sides or high and low in the baffle like the Solo 103? I'd really like to make the cabinets as narrow as possible, with the drivers in the middle, with one slot above and one slot below the driver.

Although this looks quite good as well: http://homepage.mac.com/tlinespeaker...Ken12-comp.jpg

The specifications of the drivers can be found here
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Old 13th January 2012, 08:47 PM   #4
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Quote:
Originally Posted by Bart-Jan View Post
... Bicor 250...They do, but are lacking in the bass range.
That last bit is a contradition since the purpose of the horn is to bring the bass.

dave
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Old 13th January 2012, 08:58 PM   #5
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No kidding, and going BR for the AN8's isn't going to get you any real bass either.

jeff
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Old 13th January 2012, 09:06 PM   #6
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by Bart-Jan View Post
Thanks for the quick reply!
Is it technically to have the slots on the sides or high and low in the baffle like the Solo 103? I'd really like to make the cabinets as narrow as possible, with the drivers in the middle, with one slot above and one slot below the driver.

Although this looks quite good as well: http://homepage.mac.com/tlinespeaker...Ken12-comp.jpg
It's not clear from the photos, but this design format allows for a lot of flexibility of dimensions and internal bracing for a very rigid cabinet. Bernie's pair were in reclaimed Douglas Fir flooring, and I've built dozens of pairs of variants with BB plywood. I don't get involved in the modelling aspect of design, so others will need to speak to the issue of suitability of this type for loading of the AN driver.

If a slot ported enclosure is deemed to be acceptable, you can feel free to locate them where ever you like, except on rear if close to wall.

Keep in mind that very narrow enclosures may need some degree of BSC - either active EQ before the amp, or with passive components at speaker level.


Quote:
The specifications of the drivers can be found here
If they can be considered reliable, let the games begin
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Old 13th January 2012, 09:11 PM   #7
chrisb is offline chrisb  Canada
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Sachiko, Vulcan?

If those can't deliver bass in a narrow profile enclosure, what would?
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Old 13th January 2012, 09:18 PM   #8
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Originally Posted by chrisb View Post
Sachiko, Vulcan?

If those can't deliver bass in a narrow profile enclosure, what would?
No WAF thou.

jeff
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Old 13th January 2012, 09:21 PM   #9
Trebla is offline Trebla  United Kingdom
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If you can get "real" bass from AN8s i'll be very interested.
Mine have been in three different cabinets so far.
None of which produced satisfying bass, to my taste.
They are now in OBs, and this is where they shine in my opinion.
But they need the help of some 15" drivers as well.
I still believe they are worth buying though.
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Old 13th January 2012, 09:34 PM   #10
Trebla is offline Trebla  United Kingdom
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If you can get "real" bass from AN8s i'll be very interested.
Mine have been in three different cabinets so far.
None of which produced satisfying bass, to my taste.
They are now in OBs, and this is where they shine in my opinion.
But they need the help of some 15" drivers as well.
I still believe they are worth buying though.
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