Who's Gone Topless?


The idea of this goes back decades. Amps and preamps (for the most part) are designed on chassis free breadboards, then voiced, THEN are packaged inside a chassis, which can be the weakest link to hearing what the designer intended. In most cases the chassis sidewalls and bottom are essential, but the top?


First off, beware that doing so will likely affect your mfg warranty, but, if you live in a pet-free, child-free home, then the benefits can more than offset concerns about something getting in that could harm the components. Case in point my Ric Schultz Class D EVS 1200, dual mono IcePower 120as2 modules. HOWEVER, unlike others using the same or similar modules, Ric then sprinkles many decades of modifying pixie dust all around them which are mounted inside an understated (sans bling) Italian sourced chassis.

When I ordered mine it was mandatory to purchase 2 Cubes ($200) which are to be butted up against each board, requiring the owner to remove the top. After doing so, I was anxious to put it in my rack so I could properly isolate it from bad vibes, when I should have listened with and without the Cubes and top.


Ric is also a proponent of weighing down components, but due to the unnecessarily large chassis, it barely fit in my rack, but I had a 5 pound divers belt lead weight that I squeezed in. Now, because RIc chose to put the mute toggles on the back I placed the amp on the first shelf from the rack's top (but out of sight out of mind: I never mute it when done listening), upon which was my CD player/Transport, which I raised up to provide ~ 2" of air space above the top of the 1200 and the bottom shelf of the player. Even though the rack is open on all sides with plenty of air space all around the rack, the amp ran warm

Fast Forward to yesterday. I was listening to Leonard Cohen Essential songs, mostly instrumentally sparse. I removed the weight; and found the music much more open sounding. Encouraged, I FINALLY removed the top. Honestly, I was not prepared for how HUGE doing so could be. It was like the music went from a confined space to an open air 3 dimensional venue. This is so amazing that I am going to get a handle on it via different music before removing the Cubes. Oh, and the amp is now cool as can be. 


So, if interested, stay tuned
tweak1
Just fyi; I never said I believe in any particular theory mentioned.      Just that, WE DON’T KNOW ANYTHING, for CERTAIN.      Without knowing, SPECIFICALLY, what is affecting what, regardless of the phenomena being examined/explained, "measurements" can only point in a direction and lend credence (or- not), to a theory.     That applies to Home Audio, as well as, the rest of the universe.       More a disclaimer, than a, "last word".
Not exactly sure what Huge means?  What areas sounded better?  By huge twice as good?  Please let us know.  I am not doubting you just trying to understand what and where.

Why don't manufacturers just make it right the first time - that is easy, it adds to the cost so the product would have to cost $400 more at cost and nobody sell at cost.

Back in the day many manufacturers used heavy copper chassis designs.  I use a copper plate in my components but there are other metals that also sound very good.  My Audiomeca Mephisto transport uses very thin metal but it sounds excellent versus some the the other every heavy chassis transports I have.  So who knows.


"...and you've had a group of people hear this as well?"
Voices? What voices?

The op makes the case that removing the top panel of an electronic component may improve it’s sound quality. It is also possible that doing so will degrade same, in particular if the metal chassis of the component is designed such that the top panel braces the sides (just as the braces inside speaker & sub enclosures prevent the enclosure walls from producing sound by flexing). The late Gary Dodd installed his circuits into wooden chassis; whether or not to avoid the resonances of metal I don’t know.

Old school audiophiles have long applied damping materials to the chassis of electronics to reduce resonance. Michael Percy sells EAR IsoDamp SD, made to reduce the SPL produced by the large machinery in industry. 3M makes a similar product. Real old-timers used the sound deadening mats made for automobiles, Dynamat.