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Old 27th September 2013, 03:49 PM   #11
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Happens.

I checked and double checked where the OP is from and which currency he mentioned because I fell into that trap myself a few times. ;-)
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Old 30th September 2013, 08:11 AM   #12
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Yes I am in the UK
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Old 30th September 2013, 11:06 AM   #13
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LMC I linked to earlier is the actual UK distributor for Beyma.

You can buy from them directly and they have offices in London and Birmingham.
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Old 30th September 2013, 11:35 AM   #14
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I have shortlisted two drivers:

Volt BM251.3
Beyma 12BR70

Both will hit around 80Hz-3dB/60Hz-6dB in a sealed box (between 20 and 30 Litres), both around 93/94dB, and both should have decent mid-range performance up to 800Hz but the Volt is twice the price of the Beyma.

Leaning towards the Volt (once again) having had good experience with two BM220.8 based speakers and a seperate recommendation on the Volt 10" BM drivers. They are around 60 over budget though (260/pair rather than 150/pair for the Beyma's).

As mentioned in the first post, bass depth is not critical, but bass accuracy and even response is so it seems logical to me to go sealed, hence looking at less efficient drivers over the Pro/PA models to get down to <100Hz in a sealed box.

EDIT: Ordered the Volts

Last edited by inrank; 30th September 2013 at 12:05 PM.
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Old 30th September 2013, 12:08 PM   #15
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Volt every time IMO.

But I am biased as I use RV3143s myself.
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Old 30th September 2013, 01:09 PM   #16
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I had researched the BM251.3 driver for a LONG time and had planned various projects around it, finally got round to buying a pair now!
Really not much about it on the web apart from a few praising mentions.

NExt question is, can I get away without a supertweeter on the Radian/Stereolab combo? I have read beaming will be an issue, but how is this different compared to say the beaming you get with a larger full-range-driver?
I have been using the FF225K full-range recently and found that more than fine in the treble.
Listening (critical anyway) is done on one seat so I dont need a wide sweet spot.
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Old 30th September 2013, 02:11 PM   #17
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The driver seems capable enough but I have no idea about the horn.

As far as horns go I like constant directivity types.
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Old 11th October 2013, 10:51 AM   #18
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The Volt BM251.3 bass drivers have been delivered, and got a rough plan together!

I am collecting the Radian/Stereolab/MiniDSP bits in a couple of weeks (Thanks Bevan) and have ordered some flat packed cabinets from Wilmslow Audio.
They are the 'Tornado' subwoofer cabinets, that are already designed for the 10" Volt cutout, and 40 litres which is spot on for the BM251.3 tuned to around 45-50Hz:

Click the image to open in full size.
2 by RSdesignUK, on Flickr

This will be a modular design, so I can use the bass enclosure a purely bass and cross over to my Veravox 5S cabinets as an alternative to the Radian/Stereolab combo.
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Old 11th October 2013, 04:19 PM   #19
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Volt BM251.3 Drivers:

Click the image to open in full size.
Volt BM251.3 by RSdesignUK, on Flickr

Click the image to open in full size.
Volt BM251.3 by RSdesignUK, on Flickr

With the Veravox 5S drivers:

Click the image to open in full size.
Speaker Bits by RSdesignUK, on Flickr

And potential layout with the Veravox and Fountek JP2.0s:

Click the image to open in full size.
Speaker Bits by RSdesignUK, on Flickr
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Old 11th October 2013, 07:27 PM   #20
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nice, keep us up dated
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