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Comparison Alpine SPJ-69C3 vs Alpine SPG-69C3

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Alpine SPJ-69C3
Alpine SPG-69C3
Alpine SPJ-69C3Alpine SPG-69C3
from £69.95 
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Application areacarcar
Typecoaxialcoaxial
Size6x9" (15x23 cm)6x9" (15x23 cm)
Number of bands33
Specs
Rated power90 W90 W
Max. power350 W350 W
Frequency range65—19000 Hz65 – 19000 Hz
Impedance4 Ohm4 Ohm
Sensitivity91 dB91 dB
Size
Tweeter size11 mm25 mm
Midrange speaker diameter25 mm
Mounting depth76 mm76 mm
Added to E-Catalogoctober 2012april 2012

Frequency range

The total audio frequency range reproduced by all speaker speakers.

Obviously, this range should not be too narrow, so that the acoustics do not cut off the lower and/or upper frequency limits of the reproduced sound. At the same time, the human ear perceives sound within 16 Hz - 22 kHz, and it simply does not make sense to provide speakers with a wider frequency range. We also recall that in mid-frequency acoustics and tweeters, reproducible frequencies are limited due to specialization (for more details, see "Type"). And the overall sound quality will depend not only on this indicator, but also on a number of other features.

Tweeter size

Size of the high-frequency speaker(s) included in the speaker design.

Size affects the amount of space required to install the speaker. However, high frequencies do not require large diffusers, so this dimensions is usually small and does not significantly affect the overall dimensions of the speaker system. The only exception is individual high-frequency tweeters (see "Type"), where the overall dimensions of the housing are directly related to the dimensions of the diffuser.

Midrange speaker diameter

The diameter of the midrange speaker(s) provided in the speaker. Midrange in this case may also mean a combined woofer/midrange speaker or an emitter of broadband acoustics (see "Type").

The size of the midrange speaker is often a key parameter that determines the overall dimensions of the acoustics and, accordingly, the requirements for its installation location. Exceptions can only be found among models with separate woofers (see below). But from the point of view of acoustics, a larger size allows you to achieve higher power and richer sound, including on bass.
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