Originally Posted by JimWilson
That's certainly encouraging, that someone else finally recognizes the value of BMR's. Seems to be a good news, bad news situation though...
As you say they're very expensive, especially considering Parts Express is selling that driver -- or something very similar -- for about $7. BA also seems to have mis-matched them; the center is bass reflex and uses 4.5" woofers, while the surround is acoustic suspension and has a 3.5" woofer. That strikes me as speakers that will have a different sound signature, as well as a vastly different crossover.
I thought I'd preface the rest of my reply with a bit of background information. I don't own the Cambridge Audio Minx speakers, and I wouldn't say I'm a high end audiophile or have any great technical speaker knowledge. I am a (very) long term shareholder of Hi-Wave and as such I seem to have amassed a lot of information of their products through research so might be of interest to you, well I would say so from some of the recent posts.
I haven't heard the 3.5" ferrite versions, and do believe they are very cheap (I just wish they were as cheap from our suppliers on this side of the pond!). I know that Parts Express stocked the 4.5" neo speakers for a brief spell, not sure why they took them down, but they sold for around $60 - the price you pay for lightweight and high earth metal costs.
With regard to larger speakers, and value of BMR, one of the first to market with BMR was these LR Braggs Acoustic Reference speakers, and of interest to you as they are 8" BMR speakers.
They received rave reviews iirc, although I've not seen any 8" BMR speakers since.
You'd be surprised to how many BMR implementations there are out there. You've picked up on the NAIM high end, but also for kudos they are in the new Bentley Continental (http://www.bentleymotors.com/models/new_continental_gt_speed_convertible/technology/
Down at the lower and smaller end, you can get USB implementations (Soundscience QSB), wireless (QB Mito and AQ Audio) and Revo (a Scottish DAB radio manufacturer) use BMR in most of their range.
If you're interested in the DIY angle, and I note someone mentioned using BMR in a Line Array, there are a few people trying these out - for example:
- see post #23, Derek is putting together a line array using the 4.5" versions
- A guy making a line array using the 3.5" Parts Express product
I've recently found this Kickstarter project that might interest you, and contains some nice technical details. Geoff Boyd is an ex-employee of Hi-Wave.
Me...well I'm tinkering with some of them, just out of interest more than anything. I've got a few ideas I'd like to make myself, nothing commercial really.
Hope that helps, sorry if there is too much there but as I said, it sounds like you guys are interested in the driver despite being off topic on the original Minx.