MoFi SourcePoint 8 Loudspeaker Lab Report

Lab Report

The flare of the 200mm cone, the low-profile multiroll surround and even the facetted baffle itself are all part of the 'waveguide' for the embedded 32mm tweeter. In this 'miniaturised' version of the SourcePoint 10 [HFN Apr '23] all these factors contribute to a reduction in the axial ripples seen in the bigger speaker, ensuring that the '8's on- and off-axis responses are potentially more consistent [grey vs. black traces, Graph 1]. Otherwise the response shares the flatness achieved by the '10, with errors of just ±1.6dB and ±1.9dB, respectively, from 200Hz-17kHz (discounting the +5.5dB/20kHz peak). Pair matching was a slightly wayward 1.5dB here but, again, the plastic-framed grille disrupts the response further [blue trace, Graph 1] and should be removed for keen listening. MoFi has specified a lower/realistic 87dB sensitivity for the '8 which concurs with my figures of 86.7dB/1kHz and 86.8dB/500Hz-8kHz.

The SourcePoint 8 also meets its 8ohm nominal/6.4ohm min. rating with a dip to just 7.5ohm/138Hz, and despite the high +50° phase angle from 530Hz-1.30kHz the minimum EPDR is just 3.65ohm at 241Hz. This is an 'easier' drive than the '10 though, again, the big rise in impedance to 78ohm/1.8kHz may still result in an emphasis in upper mid (vocal) response depending on the magnitude of the partnering amp's source impedance. Tube amps, in particular... THD is a modest 0.25% through the midrange (re. 90dB/1m) increasing to ~0.8% at bass freqs where the very wide 66Hz-3.4kHz/–6dB bandwidth of the 200mm woofer is met by the clean 52Hz tuning of the two rear-facing ports to deliver a fine 47Hz extension (–6dB re. 200Hz). PM


On, grey; off-axis resp inc. nearfield summed driver/ports [green], freefield corr. to 1m at 2.83V [yellow], ultrasonic [pink]. L, black; R, red; grille, blue

MoFi SourcePoint 8_Waterfall_L off-axis_35dB

Cabinet and port modes are well suppressed in the 8, leaving cone modes above the crossover

Sensitivity (SPL/1m/2.83V – 1kHz/Mean/IEC) 86.7dB / 86.8dB / 85.4dB
Impedance modulus: minimum & maximum (20Hz–20kHz) 7.5ohm @ 138Hz, 78ohm @ 1.76kHz
Impedance phase: minimum & maximum (20Hz–20kHz) –37° @ 3.52kHz, +53° @ 985Hz
Pair matching/Resp. error (200Hz–20kHz) 1.5dB / ±1.9dB/±1.6dB
LF/HF extension (–6dB ref 200Hz/10kHz) 47Hz / 33.8kHz/35.7kHz
THD 100Hz/1kHz/10kHz (for 90dB SPL/1m) 0.8% / 0.25% / 0.4%
Dimensions (HWD) / Weight (each) 456x290x335mm / 13kg
Prices £2999 (£499 stands; £3399 package)

MoFi Electronics
Chicago, USA
Supplied by: Karma-AV Ltd, York
01423 358846