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Sony VPL-CH375 Projector Review - Performance

Posted on November 25, 2014 by Jarrod Buckley
SONY VPL-CH375 PROJECTOR:  Performance -  Brightness, Noise, Audio Performance


For the brightness measurements the projector was placed upright on a table with the zoom lens at it mid zoom position.  This produced an image approximately 61 inches wide from a throw distance of 112 inches.  The projector was set to the factory default setting for each of the three Picture Modes and lumens were calculated based on an image with the projector's native 16:10 aspect ratio.  The lamp was operated in the High mode, for maximum light output.  Below are the measured peak lumens values for each of the VPL-CH375's three Picture Modes.

Picture Mode


Dynamic 3457
Standard 3502
Presentation 4690

Sony rates the VPL-CH375 at 5000 lumens, so I checked what the lumens were in the brightest picture mode (i.e., presentation) and with the zoom lens set to it maximum position (shortest throw).  In this case I measured 5028 lumens, thus verifying Sony's specification.  With the zoom set to its other extreme, i.e., for minimum magnification, the light output dropped to just under 3000 lumens or thus about about a 40% drop.

The VPL-CH375 has 3 lamp settings (High, Standard and Low).  As compared to the lumens output in the High Lamp Mode, the light output measured (while operating in Presentation Picture Mode) approximately 25% less in Normal Lamp Mode and 38% less in Low Lamp Mode.

As noted in the earlier section of this review on the picture quality, the factory default settings produced a somewhat "cool" image when viewing video in Standard Picture Mode.  I found by reducing the Color Temperature setting from the default "Middle" value to "Low" the picture quality was improved and produced more natural skin colors.  I measured the impact on brightness when making this change to color temperature in Standard Picture mode and found that the lumens were reduced by approximately 13%.

The brightness uniformity was checked and approximate a 35% drop-off in brightness has measured near the left corners of the image, as compared to peak brightness near the center of the image.  While the light fall-off near the left corners could be visually observed when projecting a full white test image, it was not very obvious when viewing presentations, photos or video material.


We do not measure the noise level produced by projectors.  The Sony VPL-CH375 is specified to produce a noise level of 36 dB in High lamp mode, 33 dB in Standard lamp mode and 29 dB in Eco mode.  These values, especially in high lamp operating mode, are toward the upper end of what is typical for this class of projector.  While the noise level, especially with the lamp operating in high or normal lamp modes, is certainly audible, it should not be distracting to most people when this projector is being used in a business conference room environment.  Changing to the “Eco” mode resulted in a noticeable decrease in noise level as compared to high lamp mode and to a level similar to that from a typical home theater projector when such a projector is operating in its normal mode

Audio Performance

The VPL-CH735 has a single 12 watt built-in speaker that produces adequate volume to not only overcome the projector’s fan noise but also is sufficient to provide the audio in a moderate size classroom or conference room.  As is typical with a small built-in speaker and with only 12 watt of power, there is no real bass.  When higher quality audio is need, or increased volume is necessary for use in larger spaces, the projector provides a audio output connector that could be connected to an external powered speaker system.

Overall, the VPL-CH375's built-in speaker produces no better than average sound quality for this class of projector.  It is adequate for providing voice narrations and background music in a moderate size classroom or conference room.  If used in a larger venue, then an external amplified speaker(s) could be used instead of relying on the projector's single internal speaker.

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