Opinion: Turning Off the Filtering

@kijanki

Before they discovered Transient Intermodulation Distortions (TIM) in 70s they made quite a few horrible SS amps. Internal overshoot of transitions was so bad that output transistors were going into momentary saturation causing tiny gaps in music. Again, brain was compensating but longer listening was very tiring.

This was before me, but very interesting. We take this all for granted. I don’t think it is even possible to buy a linear or switching amplifier this bad anymore. You would have to deliberately build one.

Dr. Leach’s paper in 1976 addressed this problem by naming a number of circuits that were important in the design, and that was the blueprint and standard for decades.

http://leachlegacy.ece.gatech.edu/papers/lowtim/feb76feb77articles.pdf

@erik_squires 

"  My home is nothing like that, but that is what I strive for.

what do you have for a system currently ?

Hi Riley,

My speakers are all custom made. My living room is a pair of these:

https://speakermakersjourney.blogspot.com/2017/08/the-natural-reference-one.html

My desktop:

https://speakermakersjourney.blogspot.com/2016/02/the-lm-1-bookshelf-version.html

That’s just half the equation though. Room acoustics are vital. That all comes from GIK Acoustics

Electronics are Mytek Brooklyn DAC, Parasound P7 pre, and ICEPower Class D amps.

IC’s are pure silver, balanced custom cables. Speaker wires are 12 guage stranded copper, nothing special.

Best,

E

@erik_squires

" Electronics are Mytek Brooklyn DAC, Parasound P7 pre, and ICEPower Class D amps. IC’s are pure silver "

thinking the system is very clean sounding, is bass a problem or no ? is it border line almost hot on the top end ? or do the speakers mellow it out ? 

Bass is dependent on placement. The speakers have tremendous amounts of dynamic range as-is, but for movies I add a sub but run these as full-range.

There never was, and never has been any "hotness" or need for the speakers to mellow out. If you are thinking of the Golde Ear AMT’s, the NR sounds NOTHING like that. The Mundorf AMT’s are glass smooth, with plenty of dynamic range. You have to understand though that I tuned the crossover and drivers for my own taste from the very beginning. Even with world class tweeters, you can always ruin the sound with a bad crossover, and while the final crossover design is simple, the work in simulation took weeks to get right.

The caps did take about 72-100 hours to break in however. A little too fast on the cymbals. I know it was the caps because I recently replaced them and the same thing re-occurred.

I will say that if I leave the system off over night and listen... it takes a good 24 hours for the electronics to warm up again.

Most who listen say they are transparent and warm sounding. The biggest issue is really the horizontal dispersion is very wide. They need a lot of room to the sides to sound as completely transparent as they can.

Compared to the Magico S1 Mk II - Not as bright, more sensitive, same dynamic range, and less boom at the bottom of male voices and piano.  When I say they are more sensitive, I mean it. The S1 needs gobs of power by comparison.

Best,


E