These sit in different price classes - Buchardt A700 costs roughly 1.7x what ELAC Navis ARF-51 does. Expect it to lead on paper; the question is whether the gap is audible enough in your room to be worth it.
| Area | Better | Why |
|---|
| Bass | A | Buchardt A700 digs deeper - 17Hz against 43Hz. |
| Built-in power | A | Buchardt A700 has the bigger amplifier (600W vs 300W RMS). |
| Connections | depends | Buchardt A700 adds Wi-Fi; ELAC Navis ARF-51 adds Bluetooth. |
| Size | depends | Buchardt A700 is easier to place; ELAC Navis ARF-51 is bigger, which usually goes with fuller bass. Your room decides. |
| Cabinet | depends | Sealed vs Ported. Sealed is tighter and happier near a wall; ported digs lower but wants space behind it. |
| Price | B | ELAC Navis ARF-51 is cheaper - $3,798 against $6,600, about 42% less; arguably a different class. |
A Buchardt A700 B ELAC Navis ARF-51
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 speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
The usual trade-off: Buchardt A700 measures better, ELAC Navis ARF-51 costs about about 74% more% less. Whether that gap is worth the money is the call only you can make - and in a normal room it is often smaller than the numbers suggest. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 43Hz anyway, which makes the cheaper ELAC Navis ARF-51 much easier to justify. In a large or open-plan room, ELAC Navis ARF-51 has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, Buchardt A700 is the easier speaker to get right.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.