Front Panel Controls
4-9
Unlike the BYPASS Mode, the audio signal from the input does travel
through active circuits on the way to the output whenever Ax is Off.
When Ax is Off, SPR (section 4.11) is still operational.
4.10 SOLO Switch
The SOLO Switch gives you a choice of auditioning the Aural Excitement
signal alone without the main audio, whenever youpress the button in. An
adjacent LED becomes lit whenever SOLO is active.
As an application for the SOLO switch, press SOLO to return the pure effect
back to an automated mixing console for precise memory control of the
Aural Excitement signal only.
Be sure to turn off the SPR effect (see section 4.11) to avoid possible phase
problems when mixing raw audio.
4.11 SPR Switch
The SPR Switch controls the Spectral Phase Refractor effect which is a new
feature on the Model 250. This effect is independent of all other controls or
switches except the RELAY Bypass Switch (see Section 4.12). An adjacent
LED becomes lit when the SPR Switch is pressed in, confirming that SPR is
On. SPR processes the main audio signal in such a way that bass frequen
cies (up to 150 Hz) lead phase in relation to the rest of the spectrum.
Through the many steps of recording, duplicating, distributing and repro
ducing sound, the phase of the low frequency audio spectrum becomes
delayed compared to mid and high frequencies. SPR corrects the bass delay
anomaly to restore clarity and openness and significantly increases the
apparent bass energy level without adding any amplitude equalization or
bass boost.
To audition the effect of SPR on the audio signal, press the Ax Switch Out.
Next, press the SPR Switch In. Then alternately press the RELAY Bypass
Switch In and Out to hear the SPR effect on incoming audio.
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