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Old 2nd March 2014, 08:06 AM   #1
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Default Which 6.5" midwoofer for this project?

Building a 2 way floorstander using an Alpair 10P and two 6.5" woofers per cabinet. Crossover will be around 375hz, 1st order.
The Alpair will be OB and a rear padded frame to absorb the backwave. The drivers will be grouped in a similar fashion to the magico S3 (as an example).

I've bought the alpair's (which look really nice, a mid grey blue cone) but can't decide on a paper cone 8 ohm mid woofer.

The woofers will be hooked up in parallel to reach the desired output

Candidates are

Scanspeak Classic 8545-11 (double magnet version)
Scanspeak Classic 8535-01 (sealed)
Scanspeak Revelator 8531G00
SB Acoustics Satori MW16P-8

The classics are a little cheaper and perform well. The Revelator offers great bass output (and looks lovely), but the minimum ohm rating is also the lowest of the four, so not sure if its suitable in parallel. The SB Acoustics is expensive but looks to be the most suitable for a 1st order design.

Last edited by Bill poster; 2nd March 2014 at 08:38 AM.
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Old 2nd March 2014, 08:28 AM   #2
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You mean you really want to connect those two drivers parallel? Without x-over, or the standard 2-way parallel x-over config.? It is not quite clear from your description. As far as sonic qualities and ease of xo design the winner is the Satori.... but also the most expensive (unless you are lucky enough to get them from Solen in Canada)
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Old 2nd March 2014, 08:35 AM   #3
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the midwoofers would be connected in parallel yes

edited the threadstarter to make it clearer, sorry

approx prices in sterling

8545 75 (special price)
8535 115
Revelator 145
Satori 155

Last edited by Bill poster; 2nd March 2014 at 08:39 AM.
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Old 2nd March 2014, 08:55 AM   #4
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At Solen, the Satoris cost about half of the british and european prices... OK, not half, but almost......
https://www.solen.ca/pub/index.php?c...=2&s2=&s3=&s4=
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Old 2nd March 2014, 10:09 AM   #5
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I cd buy in the US and get them shipped but it wd cost the same by the time the courier rings my doorbell. i.e. shipping, tax and the customs charge etc
I visit Indonesia sometimes so in future I might be able to arrange to collect direct from Surabaya

Last edited by Bill poster; 2nd March 2014 at 10:12 AM.
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Old 2nd March 2014, 02:30 PM   #6
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Don't forget the SEAS U18RNX/P. As measured by Zaph this would make a very nice woofer too I think.
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Old 2nd March 2014, 06:01 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

You won't get away with a simple 1 order x/o with an OB midrange.
Baffle hump will be your problem, quite high up, and after you've
fixed that the driver will rolling off at 6dB/octave with no high pass
below the point you've fixed the hump , and note that the baffle
roll off is chucking away driver excursion.

If you high pass a driver 2nd order electrical its excursion will
be constant with input level and frequency in the roll-off region.

So your looking at some form of 3rd order acoustic high pass.

Your bass mids will be affected by baffle step rising up towards
1KHz and a first order low pass might be possible second order
electrical with some jiggerypokery.

First order x/o's tend to be complex things if you don't
at first make it easy with your choices, and a nightmare
for an OB midrange regarding bass modulation / excursion.

rgds, sreten.
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Old 3rd March 2014, 12:24 AM   #8
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Quote:
Originally Posted by Bill poster View Post
Building a 2 way floorstander using an Alpair 10P and two 6.5" woofers per cabinet. Crossover will be around 375hz, 1st order.
The Alpair will be OB and a rear padded frame to absorb the backwave. The drivers will be grouped in a similar fashion to the magico S3 (as an example).

I've bought the alpair's (which look really nice, a mid grey blue cone) but can't decide on a paper cone 8 ohm mid woofer.

The woofers will be hooked up in parallel to reach the desired output

Candidates are

Scanspeak Classic 8545-11 (double magnet version)
Scanspeak Classic 8535-01 (sealed)
Scanspeak Revelator 8531G00
SB Acoustics Satori MW16P-8

The classics are a little cheaper and perform well. The Revelator offers great bass output (and looks lovely), but the minimum ohm rating is also the lowest of the four, so not sure if its suitable in parallel. The SB Acoustics is expensive but looks to be the most suitable for a 1st order design.
Ur best bet is the SB, the founders are x scan speak designers responsible for revelator and illuminator, the satori is there flagship and performers very, very well and then considering the price compared to the revelator...
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Old 3rd March 2014, 11:39 AM   #9
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Quote:
Originally Posted by sreten View Post
Hi,

You won't get away with a simple 1 order x/o with an OB midrange.
Baffle hump will be your problem, quite high up, and after you've
fixed that the driver will rolling off at 6dB/octave with no high pass
below the point you've fixed the hump , and note that the baffle
roll off is chucking away driver excursion.

If you high pass a driver 2nd order electrical its excursion will
be constant with input level and frequency in the roll-off region.

So your looking at some form of 3rd order acoustic high pass.

Your bass mids will be affected by baffle step rising up towards
1KHz and a first order low pass might be possible second order
electrical with some jiggerypokery.

First order x/o's tend to be complex things if you don't
at first make it easy with your choices, and a nightmare
for an OB midrange regarding bass modulation / excursion.

rgds, sreten.
Thanks sreten. To be honest I don't understand all the reasons behind some of the things you mentioned but I know you know your stuff - With the baffle hump, is that something that is specific to OB's or a general thing? In other words, does it just affect full rangers/midrangers on an open baffle?

Last edited by Bill poster; 3rd March 2014 at 11:44 AM.
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Old 3rd March 2014, 11:42 AM   #10
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Also, if the baffle has minimal diffraction, i.e. curved to the point of not being a flat section, will that make a difference?
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