I have received the 1964Q a little while ago and have burned them in for a week straight just in case if anyone should argue with my impressions. I'm currently using them with my Leckerton UHA-4. Right out of the box, the fit was perfect and the build quality is on par with Unique Melody. I have a few UM customs and I'm very impressed that 1964 Ears can match UM's craftsmanship. The major difference that I have noticed is that UM likes to use shorter stems while 1964 Ears likes to use longer stems which does provide a bit more isolation for me.
It has a remarkable bass reproduction and I'm putting it mildly. It's incredibly tight, controlled, powerful, has great impact, and extends very low. No bleeding into other ranges whatsoever. The separation and clarity of the bass is very surprising. I'm more use to the blended bass sound that I hear from other universals iems.
The mids sound very spacious with vocals sounding more forward. It's more neutral from my perspective and can sound a bit dry but still maintains a high level of detail production.
The highs are done well but it could be improved. Probably the worst aspect of the Q but to be fair it only sounds slightly recessed. It could also have sharper brighter sound with better extension. Considering that these are meant to be stage monitors I'll cut 1964 ears some slack.
To sum things up: