These are not the same size of amplifier: Technics SU-R1000 has roughly 2.1x the power of Technics SU-G700M2 Grand Class. That is about 3.3dB, so it is a question of room size and how hard your speakers are to drive, not of one being the better amplifier.
| Area | Better | Why |
|---|
| Power | A | Technics SU-R1000 has more power - 150W against 70W into 8 ohms. That is about 3.3dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Room size | depends | We rate Technics SU-R1000 the better fit for a large room and a very large room, and Technics SU-G700M2 Grand Class for a small room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output nearly doubles (300W and 140W). |
| Built-in DAC | evenly matched | Both have a DAC on board with much the same capability. |
| Analogue inputs | A | Technics SU-R1000 takes more analogue sources - 5 against 2. |
| Room to grow | evenly matched | The same expansion options on both. |
| Price | B | Technics SU-G700M2 Grand Class costs less - $2,700 against $11,999 at list. |
| Watts per dollar | B | Technics SU-G700M2 Grand Class is the cheaper watt - about $39 per watt against $80. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Technics SU-R1000 B Technics SU-G700M2 Grand Class
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both amplifiers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
Technics SU-R1000 is ahead, but on only 1 of the measured areas, and it costs about 4.4x the price. That is a lot of money for a narrow margin - Technics SU-G700M2 Grand Class is the sensible buy unless a specific feature above decides it for you. Start with the room. In a large or open-plan room, or with speakers that are hard to drive - low sensitivity, or an impedance that dips - Technics SU-R1000 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 70 watts is already more than most people ever use, and the extra 80 watts would be headroom you pay for and never hear - we rate Technics SU-R1000 poorly for near-field use for exactly that reason. Think about the whole system: the roughly $9,299 saved by taking the cheaper one would buy better speakers or a subwoofer, which does more for the sound than the difference between two competent amplifiers.
What a spec sheet cannot show: how either sounds with your speakers, how the controls feel day to day, and what the app is like to live with - which is where most all-in-one amplifiers are actually won or lost. Power figures are the manufacturers' own and are not measured to a common standard, so treat small differences as noise. If you can hear both, that will tell you more than any row above.