These are not the same size of amplifier: Technics SU-R1000 has roughly 5x the power of Technics SU-GX70. That is about 7dB, 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 30W into 8 ohms. That is about 7dB - a different class of amplifier rather than a bigger version of the same one, and far more than most rooms will ever ask for. |
| Room size | depends | We rate Technics SU-R1000 the better fit for a mid-size room, a large room and a very large room, and Technics SU-GX70 for desk or near-field listening and 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 60W). |
| Built-in DAC | B | Both decode on board, but only Technics SU-GX70 handles DSD. |
| Analogue inputs | A | Technics SU-R1000 takes more analogue sources - 5 against 2. |
| Use with a TV | depends | Only Technics SU-GX70 has HDMI ARC, so the television can drive it directly and one remote controls the volume. If the system is for music only, this changes nothing. |
| Room to grow | evenly matched | The same expansion options on both. |
| Shelf space | depends | Technics SU-GX70 takes up about 13% less shelf area (1711cm² against 1974cm²), and it is 62mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | Technics SU-GX70 costs less - $1,999 against $11,999 at list. |
A Technics SU-R1000 B Technics SU-GX70
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 6x the price. That is a lot of money for a narrow margin - Technics SU-GX70 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, 30 watts is already more than most people ever use, and the extra 120 watts would be headroom you pay for and never hear - we rate Technics SU-R1000 poorly for near-field use for exactly that reason. If this sits under a television, Technics SU-GX70 is the one to buy - HDMI ARC means the TV remote controls the volume and there is no second box in the way.
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.