Скачать или смотреть Is Gallium Nitride "better than" Silicon in Class D Amps ? Jeff Rowland Model 125 vs. AGD Tempo

NOTE: I AM A USER AND SELLER OF JEFF ROWLAND AMPS EVERY DAY FOR THE LAST 8 YEARS.
This video is my personal opinion, and made independent of any MFG. nothing more.

JRDG 125 AGD Tempo
Male Vocal 1:36 5:39
Jazz Piano 2:36 6:39
Female Vocal 3:36 7:39
Symphony 4:36 8:39

Higher Volume test:

Daft Punk 11:23 9:49
Cosmic Hippo 11:39 10:07
Bee Gees 12:02 10:49

What to listen for :
Jazz Piano, off the cuff the ride cymbal is audibly darker on the AGD. It would be orange brass, while Rowland would be yellow brass. The cymbal separates away from the piano better with the Rowland.
Female Vocal, Her voice separates better away from the piano on the Rowland and you can hear her vocal air more distinctly on the Rowland.
Symphony, Which sounds more like actual strings ? (Dont comment if your ass sits at home and never goes to the live symphony, because you have no clue)

Daft Punk, Rowland has more snap and cymbal is more open AGD is thicker in the middle
Bee Gees, Vocal peels off and away from the cymbals better on Rowland.



Here I compare the (GaN) AGD Production Tempo to my reference (Si) Jeff Rowland Design Group Model 125. The Tempo is supposed to be a 125 "crusher" and it SHOULD be for $2,000 MORE. (The Tempo PCB fits the EXACT footprint of the B&O 250 ASX2 ICE Module, which is what the Rowland uses, yet the Rowland has Jeffs signature input section which uses dual custom made Lundahl transformers for input decoupling surrounded by a Class A Analog input section developed over 40 years designing analog audio circuits) Lets see what trumps what. Audio design experience or latest technology.

Here are the specs compared. (As published on each MFG's respective webpages)

Rowland MODEL 125 AGD TEMPO
Price in USD $3500 $5500
Output Power (Stereo) 125W@ 8Ohm 100W@ 8Ohm
Output Power (Bridge-tied Load) 500W@ 8Ohm 400W@ 4Ohm
Frequency Response ( -3dB) 5 Hz -130 kHz 5Hz - 80 kHz
Input Impedance 40k ohms 40K ohms
THD + Noise @ 1kHz 0.008% 0.01%
Damping Factor @ 1kHz 500 not published
Overall Gain 26 dB not published
Weight (weighed on my shipping scale) 10.4 LB 11 LB
Overall Dimensions h-w-d 68mm x 348 x 190 95mm x 280 x 180

My opinion is that the Jeff Rowland is not only better looking, sounding and clearly more dynamic, but its $2,000 less expensive. The decision is a no brainer. My feeling is that the Tempo is a failed attempt at greatness while the other amplifiers made by AGD are the real front runners. Use AGD if the $5500 cost is within means and your rig is forward or sharp sounding. This will tame it . Use Rowland to build your high perf High End rig and give it life and punch that grabs your speakers by the Cojones. Take action on this value and contact me to purchase. Go to 11stereo.com to find out what advantages and benefits you receive from being a client of mine. (theres a reason I call you client rather than customer)

Enjoy !

Mikey !