APOGEE ACOUSTICS Full Range Ribbon Speaker System, Owner'S Manual And Assembly Instructions

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SPEAKER ADJUSTMENTS
The performance of the Apogee Ribbon Speaker will respond to
adjustments that can be made in three separate ways. The first way that
adjustments may be made is by speaker position within the room. This is
room dependant and primarily affects the openness and correctness of
the sound image. Large changes in the speaker position will affect the
frequency balance. The second adjustment is the crossover gain -
controlled by a rotary position switch. The third adjustment is the
tweeter balance which is controlled by a toggle switch on the rear of
the transformer boxes. These three adjustments should allow the user to
obtain an accurate image field recreating the original music with
proper bass - midrange - and tweeter frequency balance under most
conditions.
NATURE OF THE CONTROLS
The exact nature of the adjustments is as follows: The crossover gain
rotary switch operates to attenuate the gain of the midrange/tweeter.
Unity gain occurs with the rotary switch in the #6 position. Each
counterclockwise detent represents 1 dB of attenuation from 400 HZ to
above 200 kHz. It should be noted that this control attenuates both the
midrange and tweeter relative to the bass.
The tweeter control is operated by a toggle switch on the rear of the
transformer box. The normal position is with the switch DOWN . With the
switch UP, a 1½ dB response gain is added from 10 kHz to above
audibility. With the switch in the MID position, a 1 ½ dB response
attenuation is implemented.
ADJUSTMENT PROCEDURE
Start with the speakers positioned as follows:
(0.85m) 41" from rear wall to back of tweeter
(1.07m) 42" from rear wall to back of ear (baffle)
(2m) 6 ½ feet apart - between inside edges
Start with the tweeter switch down:
Start with the crossover gain six clicks down (CCW) from maximum
(-6db) for amps of identical gain. For others, adjust as necessary.
Play your favorite source material with full frequency content. Adjust
the crossover gain until the bass and midrange balance is correct. This
is best determined by listening for the proper amount of bass. As the
midrange is attenuated the bass will increase relative to the midrange.
When satisfied with the bass/midrange balance, move on to the tweeter
balance.
Again, while playing your favorite source material, adjust the tweeter
to full maximum (switch up) or minimum (switch in middle) to achieve
the proper "Air" to the music.
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