We had a production run of these speakers made for us, which have 2 basic changes. First...a bit earlier breakup, (I mean just a tiny bit more sag) to soften the response a bit, compared to an EVM-12L for example.
Second...I worked on the high frequency response. The EVM-12L has a very present and clear high frequency impression in cleaner and more HiFi circuit application. However, they can be a bit fast and slightly strident in response for some people (most people).
What I mean by "impression", I explain this by pointing out "the player feels the speaker". Well...we don't really, actually feel sound we hear it (except for super high sound pressures, at high volumes and high driving force, low frequency).
Our brain receives electrical impulses from the ear and extrapolates that to what guitar players refer to as "feel". Its much more complex than that but that's a reasonable explanation, I think? This is always hard...to explain "tone and feel", what it actually is and why we love some things and hate others...
Anyway...the second point in a minute. When we discuss speakers and how they sound, it's important to place the discussion with a circuit. EVM12-L speakers sound wonderful in certain circuits, good in others and horrible in many!
For example...EV-12L speakers sound and feel quite impressive in a more filtered, Higher-Fi versions of a Dumble circuit. Where the EV12L may feel less settled in a late JCM800 circuit board amp.
With that, we rounded the impression on the highs. Less sssssssssss and more liquid. The sssssssssss comes from the circuit, not the speaker...in the case for an EV-12L. The EV-12L is just really good at revealing the nature of a circuit. Suffice it to say "the end result with my version EM12, is a speaker which sits better with a gain amp like a Marshall", without making it sound unacceptable in a clean amp! The speaker sits better than a comparative EV-12L, in a Dumble, where the gain preference is preferring a warmer more pliable feel response when pushed harder with gain. However, I like the top and the slightly softer attack of my version of the EM12, versus the EV-12L
This is not to suggest this speaker doesn't sound good in clean amps and HiFi circuits...it does. Its just not so hard and direct. Again...I actually prefer it over the EV-12L in the Dumble! Sweet tone and jus the right attack. Warm, with liquid but present highs.
Its a great speaker!
I have a few of these left and I also had 16ohm versions made...which are not available in an "off the shelf EM12".
Mark.
518-894-1059