TrueScaleAudio
Compare speakers at true scale
Pick two speakers and see them side by side at their real-world size.
Front view — side by side at true scale
Click either cabinet to swap A ↔ B · Reference height: 1127 mm (112.7 cm) · 1 mm = 0.50 px
MartinLogan Motion F20vsQ Acoustics Concept 50
The MartinLogan Motion F20 stands 112.7 cm tall — about 10.0 cm more than the Q Acoustics Concept 50 at 102.7 cm. On footprint the Q Acoustics Concept 50 is the wider cabinet (39.6 cm versus 29.8 cm). At 92 dB against 90.5 dB, the MartinLogan Motion F20 is the easier load to drive and plays louder from the same amplifier. The MartinLogan Motion F20 reaches deeper in the bass, down to 35 Hz versus 42 Hz. Low frequencies come from a 165 mm cone on the MartinLogan Motion F20 and a 125 mm cone on the Q Acoustics Concept 50. Both land in a similar price bracket, around $3,700 a pair.
| A | B | |
|---|---|---|
| Manufacturer | MartinLogan | Q Acoustics |
| Model | MartinLogan Motion F20 | Q Acoustics Concept 50 |
| Height | 1127 mm | 1027 mm |
| Width | 298 mm | 396 mm |
| Depth | 362 mm | 321 mm |
| Weight | 27.2 kg | 22.9 kg |
| Enclosure | bass-reflex-down | bass-reflex-rear |
| Drivers | 1× tweeter (Folded Motion (AMT)), 1× 140 mm midrange (woven-fibreglass cone), 2× 165 mm woofer (aluminium cone) | 1× 25 mm tweeter (soft dome), 2× 125 mm mid-bass (coated paper cone) |
| Frequency — low | 35 Hz | 42 Hz |
| Frequency — high | 25000 Hz | 30000 Hz |
| Sensitivity | 92 dB | 90.5 dB |
| Impedance | 4 Ω | 6 Ω |
| Recommended amp | 20–300 W | 25–150 W |
| MAP (USD) | $3,500 / pair | $3,899 / pair |
| Where to buy | Check availability ↗ | Check availability ↗ |
| Brand website | martinlogan.com ↗ | qacoustics.com ↗ |
| Product page | Open product page ↗ | Open product page ↗ |
Larger value highlighted in green. For low-frequency extension, lower Hz = greater bass reach, so the deeper side is highlighted.