DeVore Fidelity O/93 Loudspeaker Lab Report

Lab Report

Sharing the same 28mm silk dome tweeter and similar 250mm pulp-coned bass/mid driver with the O/96 [HFN Apr '21] means there are parallels between this latter model and the lower sensitivity O/93. 'Lower' is not 'low', however, for DeVore still rates the O/93 at a high 93dB/1W/1m. With a nominal impedance of 10ohm (actually 17ohm/1kHz), this brings sensitivity closer to 92dB at the standard 2.83V/1m [see boxout, p65], a figure that's still higher than the 90.3dB/1kHz measured here. The slightly downtilted presence/lower treble [see Graph 1] drops sensitivity to 89.7dB from 500Hz-8kHz but, in practice, the O/93 only loses 1.8dB to the 96dB-rated O/96. Again, this fine sensitivity is not achieved at the expense of a punishing load as the O/93 only momentarily drops below 7ohm (155-185Hz) and, with swings in phase angle of +54°/–60° through the bass, presents the partnering amplifier with a worse-case 3.1ohm/99Hz EPDR, putting it in the top few percent of 'easy-to-drive' loudspeakers.

The 90cm-tall O/93 has been engineered to be heard on an above-cabinet axis where its response errors amount to a mere ±1.9dB (200Hz-19kHz) and pair matching a fine ±0.6dB. However, (port/cabinet) resonances are visible on the impedance/phase spectra at 190-550Hz while a driver mode at 1.9kHz, and harmonics, are visible on both the forward response and CSD waterfall [see Graph 2]. While this may contribute some 'colour', conventional distortion remains a low ~0.5% (re. 90dB SPL) through the bass and midrange, the former augmented by the 35Hz tuning of its two rear-firing ports to yield a steeply rolled-off but deep bass extension of 36Hz (–6dB re. 200Hz). PM


Response inc. nearfield summed driver/ports [green], freefield corrected to 1m at 2.83V [yellow], ultrasonic [pink]. Left speaker, black; right, red

DeVore Fidelity Orangutan 93_Waterfall_R_35dB

Modes associated with the bass/mid cone are present at 1.9kHz and 3.9kHz but treble is very clean

Sensitivity (SPL/1m/2.83V – 1kHz/Mean/IEC) 90.3dB / 89.7dB / 87.8dB
Impedance modulus: minimum & maximum (20Hz–20kHz) 6.9ohm @ 163Hz, 61ohm @ 82Hz
Impedance phase: minimum & maximum (20Hz–20kHz) –60° @ 72Hz, +54° @ 54Hz
Pair matching/Resp. error (200Hz–19kHz) 0.6dB/ ±1.9dB/±1.6dB
LF/HF extension (–6dB ref 200Hz/10kHz) 36Hz / 20.4kHz/20.2kHz
THD 100Hz/1kHz/10kHz (for 90dB SPL/1m) 0.35% / 0.3% / 0.55%
Dimensions (HWD) / Weight (each) 902x381x254mm / 21kg
Price £9998

DeVore Fidelity
Supplied by: Absolute Sounds Ltd
0208 971 3909