- Written by Jim Clements
- Published on 28 March 2011
- MartinLogan Ethos Hybrid Electrostatic Speakers
- Page 2: Design of the MartinLogan Ethos Hybrid Electrostatic Speakers
- Page 3: Setup of the MartinLogan Ethos Hybrid Electrostatic Speakers
- Page 4: The MartinLogan Ethos Hybrid Electrostatic Speakers In Use
- Page 5: The MartinLogan Ethos Hybrid Electrostatic Speakers On the Bench
- Page 6: Conclusions About the MartinLogan Ethos Hybrid Electrostatic Speakers
- All Pages
On the Bench
All the below measurements shown are in-room response. The frequency response tests were performed at 1-meter, the upper unit distortion measurements were on axis near field measurements and the distortion readings for the sub were taken at 1-meter on-axis.
The on-axis response of the Martin-Logan Ethos shows an exceptionally flat spectrum from 30 Hz to 20 kHz. There is usable response all the way out to 30 kHz.
At 30 degrees off-axis, the Ethos speakers had a response curve that was not as smooth as the on-axis test, but it doesn't really roll off any quicker in the upper registers, demonstrating that Martin-Logan has created a speaker with sufficient dispersion at this offset.
The THD at 1 kHz and 100 db was very low at 0.10%, with the first harmonic more than 60 db below the signal. This is excellent performance.
At 500 Hz and 100 db, the THD measurement is an inaudible 0.22%.
At 10 kHz and 95 db, the distortion rises to 0.35% with the second harmonic above the threshold of human hearing.
The first test of the powered sub is at 250 Hz and 100 db. The distortion is very low here, 1.6%. Keep in mind that this is just one of the subs in operation.
The sub achieved 100 db at 50 Hz at less than 10% THD + N. This is just one of the subs being driven. 10% THD+N is considered acceptable distortion at this frequency.
Here you see that the sub maxed out at precisely 10% THD and 97 db when tested at 35 Hz. Again, this is excellent performance for a single 8" subwoofer.
- VIEW COMMENTS
- NEXT SECTION: Page 6: Conclusions About the MartinLogan Ethos Hybrid Electrostatic Speakers