Wayne or anyone,

I am thinking of building a 2 way speakers based on compression driver and a mid/woofer housed in a MLTL cabinet(based on MK's worksheet).

I have a woofer in mind I wonder what you think about it, esp. Wayne who has experience with Emminence drivers. The model is Emminence, Deltalite II 2510(made using Neodymium magnet), resonance freq=53Hz and spl of 96db and Vas of 52litre, Qts=0.44 Using MLTL cabinet I can get the bass flat to 40hz.

If anyone can suggest alternative mid/woofers I am willing have a look at them. The following parameters apply, spl>=92db, qts>=0.33,Vas

The neodymium magnet technology used in Deltalite, what you think of it? will it affect the midrange which emminence is famous for? Any idea?

Thanks for your input.

Advantage:
Flater responce.
higher cross over possible.
Better midrange dispersion.
Should go just as low as the 2510 but at lower volumes.

If it fits your design parameters you might use more drivers. Like 4 instead of 2.

Just a thought mind you.

thanks for your input.

As for neodymium, it is powerful for its weight, which I think is its strongest point. The Deltalite series may offer reduced distortion over their ferrite counterparts, but I don't expect big improvements there.

Eminence tried to make drivers with shorting rings - the Magnums - but later abandoned them. That's an unrelated technology, but the point is I'm not sure Eminence is really focused on research and development. They are great at making good drivers with traditional ferrite structures but I don't expect them to do much development of other technologies. Perhaps in the case of neodymium, they were able to just basically mount a different magnet and that's it. But I'm concerned about thermal performance and things like that.

I prefer Eminence as a bang-for-the buck driver. They make very good sounding traditional ferrite drivers. I don't expect hi-tech motors from them, just good quality ferrite ones. But maybe their neodymium speakers are good too, and I should give them a closer look.

It might be worthwhile to get one of Eminence's neodymium drivers and their corresponding ferrite driver and see how the two compare. I have not done this, and probably should. It is worth taking the time to measure them and see. I'd focus on comparing electro-mechanical specs, the shift with temperature and the ability to withstand heat without damage. I'd be interested to compare harmonic and intermodulation distortion too.

After spending some time searching I found an alternative mid/woofer, it is Beyma 10BR60, the spl is only 92dB, it is a compromise. the rest of the data looks very good, Rs=45hz, Qts=0.47, Vas=47l, etc, also it can crossed above 1.5khz, close to 2-3khz.

Wayne, I thought may like to know this.