Originally Posted by
EarmarkMarine
The Wetsounds coaxials have an aggressive top end (voiced specifically for in-boat use) so I was also surprised to hear this. However, the location can make a difference.
Going forward with supplemental tweeters keep a couple of issues in mind.
Detached (separated by distance) tweeters can sound extremely abrasive and destroy any resemblance to an image. So try and keep supplemental tweeters vertically aligned with a dominant set of coaxails. On the other hand, if you are trying to correct a scenario where all four cockpit coaxials are behind you (the driver) with nothing in front of you (bow speakers don't count) then horizontally detached tweeters are the only solution. But this introduces new problems that you have yet to experience.
Don't waste added tweeters, which are highly directional as the high frequency increases, in a location where you, as the driver, cannot benefit. One carefully placed set should do the trick.
One tweeter isn't necessarily brighter than another as a standalone driver. It's the hotter relationship between the tweeter and midbass driver that creates that perception.
If you get too aggressive with tweeters you will kill the integrity of all vocals. So I would attenuate the tweeter enough to maintain some musicality and I would raise the crossover point on the supplemental tweeter so that it accentuates vocals less and percussion/upper harmonics more. A higher crossover selection may in fact be all the attenuation that you need in order to keep balanced vocals while restoring the distinctive qualities and detailed highs.
If you have a pair of dedicated tweeter channels then you might consider adding a Pac LC-1 as a convenient adjustment tool.
David