Horn speakers , high efficiency but not “shouty”

@newtoncr,
You seem pretty tight with ASC, how about posing the question to them? 
I would hesitate to start messing w/cables and tweaks for this stuff until you've maximized the placement & setup and convinced yourself this gear is definitely a keeper. 
FWIW, I've only heard  a couple of horn setups that do any of what you're after, although they certainly have plenty of immediacy and other strengths....tradeoffs...always tradeoffs. Since the designer setup the rig, did he comment that HE thought is was sounding like it should? If yes, oh no!
Hate to ask but is seeking a refund or selling them on the table? Sorry to poke my head down the darkened hallway! Cheers,
Spencer

@sbank Brian agreed the sound was not what his system should produce . He wants me to visit him and hear first hand how his system sounds in his setup . He is a great guy . Always willing to work with you.

room treatment, Brian is against them . But I have talked to asc multiple times and we have measured the room, taken recording from the room and analysed . Again the horns and how they interact with the room is not everyday for them.  They have recommendations, they recommended a soffit design for control of front end ringing . We r still working on room optimization. We tried tube traps in different configuration it just killed the music for me . 

I have built over 100 full-range driver systems. What you are describing is a characteristic that they can have if cabinets are too lively.  All lack extension on top and bottom =unless giant. I would consider a bass horn system or multiple large subwoofers and adding a tweeter like a Fostex t900a. 300b amplifiers while lovely things some can sound thick and a bit sloppy and can cause resonance issues with some BLH. When I build full-range systems they are very large and the cabinet is very much overbuilt to reduce any coloration. 

Hi @johnk ,

How do you compensate a low midrange drop that is typical for all full range drivers?
Is any other solution than front horn to support these frequencies?

Regards,
Alex.

Newton
Given that Brian agreed with your assessment he shouldIf take them back.  He could always try different drivers, capacitors or resistors in the speaker.  I can tell you my Viking Acoustic Grande Voix Dual horn speakers are everything that I dreamed about.