My New Review of the Spatial Hologram M4 Open Baffle Speaker

Hey yesterday I was twiddling with the speakers in my wife’s sunroom (switching in an old pair of Boston A40 sereis II I had just re-foamed to try) and my wife asked out of nowhere if I could put a pair of white speakers in there to match the decor better.

So there you go. The wife is asking for a new pair of speakers. What can I say except OK? Now I gotta show her a picture of the Holograms and get a reaction. They are much bigger that what’s in there now.

Also I have had floor interaction problems with every pair of speakers I’ve tried in there. The Holograms are likely no different. I’d need to find an isolating platform of some sort that fit them. My current Isoacoustics brand monitor stands in there would not.

BTW in the initial audition, the little old Boston’s sounded really good in there! I recall their sound from about 30 years back when I bought them and had high hopes for them in the sun room. They did not disappoint. These little old babys are sounding very smooth yet detailed! The tonality reminded me of Goldenear Aon speakers I have heard and liked recently. The re-foaming really did the job! But the wife wants white speakers so there you go.

Has anyone heard the difference between turbo and turbo s models?  Turbo S uses more expensive compression driver apparently but what is the difference in the sound I wonder?

I saw where somebody online wrote about having moved up from the Turbo to the Turbo S and thought the Turbo S was a substantial improvement. When I spoke with Clayton about the difference, he joked that at our age (late 50s) unless we had an unusual amount of hearing above 14,000 Hz, there might not be that much difference. :-)
What I have heard over and over again is that the better crossover parts that are used in the higher end models do make quite a difference. That's why my M4 pair is the (no longer available) base model, but with the better crossover parts. Hope that helps.

as i sit here listening to my audio nirvana full range drivers in open baffles i can only nod in agreement. it sounds like the crossover is exlnt in that unit. i recently put the drivers back in cabinets and while the bass gets more punhcy i realize that i have been conditioned to think that is better. it isnt. the openness of the bass sans box is much more realistic imo. great review

So there you go. The wife is asking for a new pair of speakers. What can I say except OK? Now I gotta show her a picture of the Holograms and get a reaction. They are much bigger that what’s in there now.

Map, here’s a photo of the M4s to scale.