[Charles]

Hello Andrew and very glad to have you on AA. I read your comprehensive review and thought it was informative, well written, and honest. After reading it and thinking about it, the conclusion I came to was that it had to be your room, since the speaker is rated at 8 ohms and goes down to 15 Hz. It should not need a subwoofer. It should be relatively easy to drive. The roll off beginning at 38 Hz was perplexing as was the change in the frequency response with the various amps. When I am evaluating a speaker for purchase, I want to know how it sounds without a sub. It's unusual for speaker like this to require a sub. I do not believe the speaker worked well in your room. Just my opinion.

Best

Charles

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Charles Updated System: Wilson McIntosh Audioquest
New gear on order: McIntosh MC3500 MK II mono power amp, one per channel; custom granite slabs to set my MC3500 MKII’s; 3 AS125 custom made McIntosh amps stands
Most recent updates: Latest is the last one posted: AQ Diamond USB replaces AQ Coffee; Wilson Audio Specialties Alexx replaced by Wilson Audio Specialties XVX Chronosonic; new subwoofer crossover; new Galaxy Grey Thors Hammer; Wilson Pedestals; heating and cooling completely reworked and reinsulated resulting in a much quieter, cooler, and more efficient room (cost about 10,000.00). McIntosh MCT 500 SACD/CD transport. Wilson Audio Acoustic Diode for XVX Chronosonic. WEL Signature digital Coaxial cable for MVP 881/D1100 digital connection replacing the optical connection. New plinth for Thor subwoofer made of X material with the Wilson Acoustic Diodes. Thor is now off my floor.
Amps: McIntosh 1.25KW’s (3) set on floor on custom made granite slabs
Preamp and DAC: McIntosh D1100
Sources: McIntosh MCT500 SACD/CD Transport, MVP881 BR player, MVP851 DVD player, MR87 tuner, Marantz 510LV Laser Disc player, ASUS laptop USB (JRiver Media Center 23)
Speakers: Wilson Audio Specialties XVX Chronosonic; custom made Wilson Acoustic Diodes
Sub-woofer: Wilson Audio Specialties Thor’s Hammer (1) horizontal lie and Wilson Watch Controller (abbr: WC); custom plinth of X material with Wilson Acoustic Diode feet
Cables main system: Audioquest WEL Signature speaker cables and balanced IC (preamp to amps); WEL Signature AES/EBU balanced digital IC for CD playback; WEL Signature digital coaxial cable for MVP 881/D1100 digital connection; Audioquest Diamond optical (1) for tuner, (1) for MVP 851 DVD player, and (1) for LD player for total of (3); Audioquest Diamond USB cable; McIntosh MCT cable for SACD playback; Dragon power cords (5 HC cords and 3 source cords for total of 8); Thunder HC power cord for MR87 tuner
Cables subwoofer system: Audioquest Redwood speaker cable (1); Wolf balanced subwoofer IC from WC to amp; Wind balanced IC from preamp to WC; Hurricane HC (2) and Dragon HC (1) power cords
Power conditioners: Audioquest Niagara 7000 (1) and Niagara 5000 (3); (4) dedicated 20-amp lines with no. 10 wire straight out of fuse box
Isolation: Wilson Pedestals for D1100; MVP881 BR player; MCT500 transport; MR87 tuner; plinth for Thor subwoofer made of X material with the Wilson Acoustic Diodes
Cabinet: Double Custom Woodwork & Design (CWD) solid walnut cabinet on large casters; holds all sources and preamp; also, Niagara 7000; 11 feet minimum distance from speakers
Acoustic Treatments: Room and Echo Tunes
AC: Dedicated to this room only, an ultra-high efficiency and quiet recently installed Ruud split system 3-ton heat pump.