Green Mountain Audio Chroma HX

Hi, Folks,
Do any of you have any experience with the latest iteration of Roy Johnson's Green Mountain Audio Rio stand mount? He's upgraded the crossover and internal wiring, and it's now called the Chroma HX.
Any impressions?


Kenjit: "That sounds like what you’re doing Audiokinesis. You accuse me of dishonesty and question my motives all the while avoiding addressing any of the criticsms I’ve made to justify my belief that the product is flawed."

So now you accuse me of doing what you did (avoiding questions) when you NEVER directed a question at me until just now?  Kinda hypocritical, don’t you think?

I expect you to answer my questions about your room and amp in exchange for my responding to your criticisms.

Quoting kenjit again:

"1. Wrong box / woofer combination
2. The tweeter used in mine were not impedance corrected and not rolling off sufficiently.
3. Crossover was not optimized"

Here are my responses:

1. All box/woofer combinations involve tradeoffs.  You may disagree with Roy’s choice of tradeoffs, but that does not make them “wrong”.  A bigger box might go lower at the expensive of pitch definition.  A different woofer might have more bass but not meet the requirements for a time-coherent two-way speaker.  Did you try positioning the speakers to take full advantage of boundary reinforcement?  The speaker/room interaction dominates the bottom few octaves.

2. A tweeter does not necessarily need to be impedance corrected; competent designers aren’t limited to cookbook approaches.  And a first-order filter (essential for a time-coherent design) inherently has a gentle rolloff slope, so you have confirmed that Roy was doing that right.  Some tweeters can handle it and some cannot, it all depends on the specifics, but Roy is plenty smart enough to choose one that can.  I bet you could too if you had the right test equipment and used it properly.

3. How in the world do you know that the crossover is not optimized?  Have you seen the measurements?  Were you there when Roy presumably said, “It’s been a long day, I’m not going to optimize this crossover”?  What in the world basis do you have for making this kind of statement?  You don’t like the speaker, that’s one thing, but don’t start making things up.  There’s a word for that.  And aside from an incredible stroke of good luck, it is impossible to even approach time coherence without a LOT of optimization.

Now it’s your turn.  Show us that you’re not a hypocrite.  Tell us about your room and your amp.


Have you seen the measurements?
I asked green mountain but they refused.

Tell us about your room and your amp.
That would be off topic. This is about the green mountain chroma speakers. Not rooms or amps. I tried different rooms and had the same problem. How do you explain that? How do you explain that the green mountain authorized dealership came round and set them up using the same room and amp and made no comments about them?
Where is the proof that the green mountain chroma speakers are time and phase coherent?  Where is the proof it's response is flat? Where is the proof the cabinet is inert and free of resonances? 
Where is the proof that using a smaller box for that woofer brings any advantages?  have you heard the speakers?  Taken them apart? Modified them? I've done all those things. I know what I'm talking about. Putting a woofer into a cabinet changes it's response in the upper range. Do you agree? Therefore a 0.21mh coil will not automatically result in perfect first order acoustic roll off. That inductance is arrived at for an electrical 4 ohm load at 3khz crossover point. To get a first order roll off, you'd need to measure the raw woofer in the cabinet. Then you'd need to do a series of simulations to get the desired acoustic slope. Where is the proof this has been done? It obviously doesn't look like it has. So why is it wrong for me to state that no measurements were made? 

"That would be off topic."

You made your room and your amp "on topic" when you attacked Roy and his speakers based on how they sounded in your room and with your amp.

"[unreasonable and unfounded attack... unreasonable and unfounded attack... unreasonable and unfounded attack]...So why is it wrong for me to state that no measurements were made?"

Because it is wrong to lie.


I think Kenjit should share HIS measurements that back his claims. What did you use to take your measurements? Why not show your proof of your claims? Surely all of your measurements and the method you used would be of some importance in this discussion. 
I have  been listing to my GMA RIO hxs that received the GMA new burn in treatment  for the crossovers. This treatment  is even more of an improvement  in the sound than the chroma hx upgrade was. They now blow away any of the many good speakers I nave owned over the past 40 years. The improved  detail and musicality result in far more enjoyment in listing to my cds and vinal. They are more musical than any of the systems I heard at  the Oakland  hi fi show recently. Everyone  who hears them is blown away by their sound. Many thanks to Roy Johnson and his expertise in speaker building.

 Thnnks again ! 
 Steve Cochran