Part 3 of the NHT 2.5i review contains frequency and impedance measurements of the individual loudspeaker driver’s mounted in the NHT 2.5i enclosure.
Tweeter:
Frequency:
Frequency measurement conditions:
Mic position: 1m distance, on mid-woofer-axis.
Smoothing: 1/24 octave smoothing applied.
(click on picture to zoom)
Left: Frequency response on-axis.
Right: Frequency response 15deg off-axis.
Blue = Left loudspeaker.
Red = Right loudspeaker.
(click on picture to zoom)
Left: Frequency response on-axis, 15 and 21deg off-axis.
Right: Frequency response 30, 45 and 60deg off-axis.
A smooth and linear tweeter frequency response. The aluminium dome break-up at 26kHz is well suppressed by the diffusor.
Impedance:
Blue: Left loudspeaker.
Green: Right loudspeaker.
Mid-woofer:
Frequency:
Frequency measurement conditions:
Mic position: 1m distance, on mid-woofer-axis.
Smoothing: 1/24 octave smoothing applied.
(click on picture to zoom)
Left: Frequency response on-axis.
Right: Frequency response 15deg off-axis.
Blue = Left loudspeaker.
Red = Right loudspeaker.
(click on picture to zoom)
Left: Frequency response on-axis, 15 and 21deg off-axis.
Right: Frequency response 30, 45 and 60deg off-axis.
The Peerless mid-woofer has a smooth and extended frequency response without any violent cone break-ups.
Impedance:
Blue: Left loudspeaker.
Green: Right loudspeaker.
The closed box resonance @ 93Hz
Sub-woofer:
Frequency measurement conditions:
Mic position: Nearfield. With and without cross-over.
Smoothing: 1/24 octave smoothing applied.
(click on picture to zoom)
Left: Nearfield frequency response without x-over.
Right: Nearfield frequency response with x-over.
Blue = Sub-woofer.
Red = Port.
Green = Sum port+sub-woofer.
The cross-over gives a 3.5dB boost @ 75Hz.
Impedance:
(click on picture to zoom)
Left: Impedance without x-over.
Right: Impedance with x-over.
Blue: Left loudspeaker.
Green: Right loudspeaker.
Box tuning frequency @ 33Hz without x-over and 30Hz with x-over.
Go to NHT 2.5i review part 4