Merlin X-Array Install Manual
page 9
midrange, and horn acoustic alignment in one
specific system, but particularly important to
consider when combining different types of systems
such as two-way plus three-way, or woofers plus
subwoofers, etc.
If these delays are not properly accounted for and/
or properly set, it can have a quite detrimental
impact on system frequency response and
directional characteristics. Each of the QuickMAP
channels contain an in-line delay before the
crossover which can be varied over wide limits to
compensate for speaker position, speaker
characteristics, and other system parameters.
Each output of the QuickMAP also includes inherent
delays which depend on the amount of processing
that resulted in that particular output. Ideally, the
inherent delays are the same on all the outputs, but
sometimes they can not be made equal.
All outputs of the two-way QuickMAP have a latent
delay of 10 sample periods (about 208 us).
Unavoidably however, the three-way QuickMAP has
unequal latent output delays which are listed as
follows:
1. Outputs a_Low, a_Mid, b_Mid, Sub1, and
Sub2: 10 sample periods (about 208 us at
the 48 kHz sample rate);
2. Outputs a_High and b_High: 12 sample
periods (exactly 250 us);
3. Output b_Low: 13 sample periods (about
271 us).
To compensate for the additional delay on the high-
frequency outputs, the component offset delay
block settings have been reduced by two sample
periods. The additional three-sample delay in the
low-frequency path of the “b” channel is
uncompensated, but adds a negligible amount of
delay to the woofer.
4.4.
QuickMAP Input and Output Assignments
The inputs of both the two-way and three-way
QuickMAPs have been assigned to module #1 of
the ISP-100. Where possible, the remaining outputs
follow the Merlin ISP-100 convention of assigning
outputs in low- to high-frequency order, high- to
low-number module order, and letter “a” to “b”
order. When looking at the ISP-100 from the rear,
this conveniently places the low-frequency outputs
on the left and the remaining higher-frequency
outputs proceeding left to right.
FIGURE 6 - 3-Way Quick Map
SELECTOR
(Select_a)
FILTER SET
6 Bands
(Filter_a)
FILTER SET
7 Bands
(Filter_a_High)
FILTER SET
8 Bands
(Filter_a_Mid)
DELAY
0 to 1350 ms
(Delay_a)
LIMITER
(Limiter_a_High)
DITHER
(Dither_a_High)
DITHER
(Dither_a_Mid)
HIGH OUT
Channel a
(Out_4a)
LOOK-AHEAD DELAY
0 to 50 ms
(DelayLim_a_High)
INPUT
Channel a
(In_1a)
HF
LF
MF
INPUT GAIN &
LEVEL METER
(Gain_a)
LIMITER
(Limiter_a_Mid)
MID OUT
Channel a
(Out_5b)
FILTER SET
8 Bands
(Filter_a_Low)
DITHER
(Dither_a_Low)
LIMITER
(Limiter_a_Low)
LOW OUT
Channel a
(Out_5a)
SELECTOR
(Select_b)
FILTER SET
6 Bands
(Filter_b)
FILTER SET
7 Bands
(Filter_b_High)
FILTER SET
8 Bands
(Filter_b_Mid)
DELAY
0 to 1350 ms
(Delay_b)
LIMITER
(Limiter_b_High)
DITHER
(Dither_b_High)
DITHER
(Dither_b_Mid)
HIGH OUT
Channel b
(Out_3b)
Side Chain
LOOK-AHEAD DELAY
0 to 50 ms
(DelayLim_b_High)
INPUT
Channel b
(In_1b)
HF
LF
MF
INPUT GAIN &
LEVEL METER
(Gain_b)
LIMITER
(Limiter_b_Mid)
MID OUT
Channel b
(Out_3a)
FILTER SET
8 Bands
(Filter_b_Low)
DITHER
(Dither_b_Low)
LIMITER
(Limiter_b_Low)
LOW OUT
Channel b
(Out_4b)
SELECTOR
2 to 1
(Select_Sub1)
FILTER SET
6 Bands
(Filter_Sub1)
DELAY
0 to 1350 ms
(Delay_Sub1)
DITHER
(Dither_Sub1)
LIMITER
(Limiter_Sub1)
COMBINER
(2xComb_Sub2)
FILTER SET
6 Bands
(Filter_Sub2)
DELAY
0 to 1350 ms
(Delay_Sub2)
DITHER
(Dither_Sub2)
LIMITER
(Limiter_Sub2)
SUB1 OUT
(Out_2a)
SUB2 OUT
(Out_2b)
Electro-Voice X-Array Install
Merlin ISP-100
3-Way Quick Map
File: xi-3way.qms
(Vers. 2.1, Sept. 14, 1998)
Threshold
Control
Input
Threshold
Control
Input
Side Chain
COMPONENT DELAY
0 to 50 ms
(Delay_a_High)
COMPONENT DELAY
0 to 50 ms
(Delay_b_High)
