The Gospel according to Eminence (bild yo own spkrs, yay!)

[stubhead]

There is actually quite a good bit of info here, starting with how to UNDERSTAND speaker gibberish (the next time yo brthr-in-law starts yakking speaker/snido/superiority yakk at yu....).
http://www.eminence.com/support/understanding-loudspeaker-data/
WIRING the damn things, making 4ohms into 8 ohms and 8ohms into 4, or 16 etc. - this one's going into my reference book.
http://www.eminence.com/support/wiring-diagrams/
How to get the tone out of speakers:
http://www.eminence.com/support/tone-guide/
For some reason on the "tone" data, they only list Eminence?  :icon_scratch: I guess they're still working on the data from Celestion and Cerwin-Vega and Dingledorfs and Black Widows and JBL 'n... maybe not quite time yet to turn those dusty ol' JBLs into micro-frisbees or storage for my sock puppets. Hmmp.

 

[swarfrat]

One thing to keep in mind is that your average guitar box grossly ignores Thiele-Small parameters (and thus we have our beloved midrange bumps).  If you were to try to correctly size a Celestion 412 it'd be about the size of a station wagon.

 

[mayfly]

Eminence makes my favourite guitar speaker. Period.

With what they have for products these days,  there must be a speaker to suit anyone.

 

[Dan025]

as. long as your not going for a ported design the tuning isn't that critical. these speakers are mostly suitable for free air or dipole enclosures with no extra pressure load on the cone. sealed boxes are somewhat forgiving but bigger is generally better for bass. smaller will give a sharp midrange peak generally but if precisely tuned the hump can be just below the rolloff with the right strength to flatten out the curve for some additional bass extension. if in doubt go bigger since a proper tuning isn't critical to control cone excursion and thus improve power handling like on the speakers in you car sub or home HiFi setup. with a sealed back the bass extension is generally better than open back due to lack of cancellation anyway but the roll off is steep at @ 12db/octave.

open back designs create a dipolar pattern. this theory is much easier to understand. the tuning on these is done by box depth. basically the bass rolls off at 6db/octave when the wavelength is longer than the distance from the center of the cone to the edge of the baffle due to cancellation of the rear of the cone to the front. you measure this distance along the surface of the baffle and sides not direct measurements. generally deeper is better with no I'll effects to mids or highs.

sealed boxes with tuned ports are harder to engineer. also the designs for musical instruments tend to completely ignore the conventional alignments used in HiFi. the bass extension can be best with these if done well but the sound is often described as loose or less tight. if the alignment is wrong and you get a resonant peak you can over travel the speaker cones and damage tube amps since the impedance can go very high at a resonant peak.  I don't recommend doing a ported box unless you are copying a successful design. doing the math from scratch might suggest impossible dimensions and fudging the numbers might lead to unexpected results.

 

[Cagey]

Eminence makes my favourite guitar speaker. Period.

With what they have for products these days,  there must be a speaker to suit anyone.

I'm a big fan, too. Very nice stuff, and reasonably priced. The Delta Pro 12A is their answer to the EVM 12L, at about 1/2 the price and with no compromises. Highly recommended.