SPL Crossover User manual

Professional Fidelity
Mastering Grade Listening
VOLTAiR
120V DC Audio Rail
ON
LOW CUT
StereoMono
2412
PHASE
LOW MID-HI
5
0
6
0
7
0
8
5
1
0
0
1
2
0
ROLL-OFF | dB
Crossover
X-OVER
OUT
20HzOffOnOff
VU
MID-HILOW
Input
Active Crossover
0
1
8
0
L
O
W
L
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V
E
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B
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Crossover – User Manual
Active analog -way crossover
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2
Welcome
and thank you for choosing the SPL Crossover.
The SPL Crossover is a high-end active analog -way crossover that will perfectly team up your subwoofer(s) with
your top speakers. You can tune crossover frequencies, align the phase response and set levels all in the analog
domain.
VOLTAiR technology is what we call our proprietary V rail technology within the Professional Fidelity series. The
Crossover uses this technology throughtout and makes it an outstandig device in terms of dynamic range, signal-
to-noise ratio and headroom. It delivers an exceptional sound experience with invincible serenity, transparency and
realness.
VOLTAiR
120V DC Au dio Rail
ON
LOW CUT
StereoMono
2412
PHASE
LOW MID-HI
5
0
6
0
7
0
8
5
1
0
0
1
2
0
ROLL-OFF | dB
Crossover
X-OVE R
OUT
20HzOffOnOff
VU
MID-HILOW
Input
Active Crossover
0
1
8
0
L
O
W
L
E
V
E
L
|
d
B
X
-
O
V
E
R
|
H
z
5
0
6
0
7
0
8
5
1
0
0
1
2
0
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-
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Ø
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VU
120
6
Var
-180°
Var
0°
Off
LOW OUTPUT
LOW OUTPUT
Serial
Number
Made in Germany
Crossover
~ 115V AC / ~230VAC, 50 Hz / 60Hz, P max. 50 W
AVIS: RISQUE DE CHOC ÉLECT RIQUE • NE PAS OUVRIR
RISK OF E LECTR IC SHOCK
DO NOT OPEN
CAUTION
RL RL RL
L
L
RLR
INPUT
INPUT
1 3
2 4
Connect to
SPL Performer
Amplifier (s)
for remote
power on/off
AMP CTL/ 12V TRIGGER
AMP CTL/ 12V TRIGGER
IN OUT OUT
MID-HI OUTPUT
MID-HI OUTPUT
LR
RCA
230V AC:
T 630mA
L 250 V
115V AC:
T 1.2 A
L 250 V
FUSE
FUSE
R
1. Remove Fuse Holder
2. Exchange Fuses
3. Flip Over
4. Reinstall
VOLTAGE SELECTION
VOLTAGE SELECTION
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Content
Getting started 
Front view 
Rear view 
VOLTAiR – V Rail Technology 
Comparisons 
LOW Section 
OUT Mono/Stereo 
X-OVER | Hz 
PHASE 
LEVEL 
MID-HI Section 
X-OVER On/Off 
X-OVER | Hz 
ROLL-OFF 
LOW CUT 
VU Meters 
AMP CTL (Standby / Amplifier Control) 
Specifications 
Inputs 
Outputs 
Internal operating voltages 
Power supply 
Dimensions (incl. feet) 
Weight 
Important Notes 
Declaration of CE Conformity 
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4
Getting started
Getting started
Read thoroughly and follow the instructions as well as the security advices of the Quickstart
which is enclosed in the scope of delivery! You can also download the Quickstart here.
By pressing the -Button you get to the table of contents.
By pressing the -Button you get to the front view of the unit.
By pressing the -Button you get to the rear view of the unit.
By pressing the -Button you get to the previous content.
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5
Front view
VOLTAiR
120V DC Audio Rail
ON
LOW CUT
StereoMono
2412
PHASE
LOW MID-HI
5
0
6
0
7
0
8
5
1
0
0
1
2
0
ROLL-OFF | dB
Crossover
X-OVER
OUT
20HzOffOnOff
VU
MID-HILOW
Input
Active Crossover
0
1
8
0
L
O
W
L
E
V
E
L
|
d
B
X
-
O
V
E
R
|
H
z
5
0
6
0
7
0
8
5
1
0
0
1
2
0
X
-
O
V
E
R
|
H
z
P
H
A
S
E
|
Ø
°
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1
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VU
120
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Var
-180°
Var
0°
Off
Front view
Stand-By
1
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LOW X-OVER 3
LOW PHASE Switch 5
LOW Mono/Stereo 6
LOW PHASE Control 7
MID-HI X-OVER On/Off 8
MID-HI Roll-Off 9
LOW LEVEL
10
LOW CUT 12
VU Calibration
12
VU Meter Source Switch
13
VU Meter
2
MID-HI X-Over
4

6
Rear view
Rear view
LOW OUTPUT
LOW OUTPUT
Serial
Number
Made in Germany
Crossover
~ 115V AC / ~230VAC, 50 Hz / 60 Hz, P max. 50 W
AVIS: RISQUE DE CHOC ÉLECTRIQUE • NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
RL RL RL
L
L
RLR
INPUT
INPUT
1 3
2 4
Connect to
SPL Performer
Amplifier (s)
for remote
power on/off
AMP CTL/ 12V TRIGGER
AMP CTL/ 12V TRIGGER
IN OUT OUT
MID-HI OUTPUT
MID-HI OUTPUT
LR
RCA
230V AC:
T 630mA
L 250 V
115V AC:
T 1.2 A
L 250 V
FUSE
FUSE
R
1. Remove Fuse Holder
2. Exchange Fuses
3. Flip Over
4. Reinstall
VOLTAGE SELECTION
VOLTAGE SELECTION
Audio Inputs XLR
18
RCA Switch
17
Audio Inputs RCA 16
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AMP CTL Input 19
AMP CTL Outputs 20
MID-HI Outputs
22
LOW Outputs
21
Mains Switch 14
Mains Voltage 15

7
VOLTAiR – 120V Rail Technology
VOLTAiR – V Rail Technology
VOLTAiR is the synonym for our V Rail Technology within the Professional Fidelity series. The audio signals
are processed with an unequalled +/-V DC, which corresponds to four-times that of semiconductor operational
amplifiers.
VOLTAiR technology reaches outstanding technical and sonic performances. Technically especially in terms of
dynamic range and headroom and sonically especially in reproducing the finest details and delivering a totally
relaxed sounding audio experience. Music sounds absolutely natural.
SPL's V Rail Technology is the internal audio processing voltage (+/- V DC).
It is not to be confused with the external mains voltage (e.g. V or V AC).
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VOLTAiR – 120V Rail Technology
Comparisons
These diagrams show how our VOLTAiR technology compares to standard IC (integrated cicuit) designs.
The direct relation between operating level and maximum level is fundamental for the classification: the higher
the operating level, the higher the maximum level a circuit can handle. And since virtually all essential acoustic
and musical parameters depend on this relation, a higher operating voltage has a positive impact on the dynamic
range, headroom and signal-to-noise ratio.
0
20
40
60
80
100
120
Volt
30 V
120 V
+ / -  Volt + / -  Volt
Operating Voltage
120
125
130
135
140
145
dB
124,2
141,4
OPA @ V SPL- OP@ V
Dynamic Range
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9
VOLTAiR – 120V Rail Technology
Do bear in mind that dB scales do not represent linear but rather exponential increases. A dB increase corresponds
to doubling the acoustic power, +dB correspond to twice the sound pressure level, and +dB correspond to twice
the perceived loudness.
When it comes to volume, the VOLTAiR technology exhibits a performance, in regard to maximum level and dynamic
range, that is twice that of common components and circuits given that its values are approximately dB higher.
THD measurements show a difference of over dB compared to the TL at V — in terms of sound pressure
level, that corresponds to an improvement of more than %. The operating level most commonly used for audio
equipment is +/-  volts.
Max. Audio Level
OPA @ V SPL-OP@ V
0
5
10
15
20
25
30
35
dBu
21,5
33,2
TL @ V SPL-OP@ V
-115
-113
-111
-109
-107
-105
dBu
-106
-114,2
THD&N
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10
LOW Section
LOW Section
In the LOW section you control the crossover frequency, the level, the phase of the LOW section. You also select
whether your playback system has a single subwoofer or two subwoofers.
OUT Mono/Stereo
If your playback system consists of two top speakers and a single supwoofer (. set-up)
set the Mono/Stereo switch () to mono. The left and right channels are then summed to
mono.
The mono LOW signal is passed to both outputs L and R (). You can select either one to drive your subwoofer.
X-OVER | Hz
The LOW crossover filter is a Linkwitz/Riley design. The roll-off is  dB per octave.
Set the crossover frequency with the LOW X-OVER switch(). Available crossover frequen-
cies are: , , , ,  and  Hz.
5
0
6
0
7
0
8
5
1
0
0
1
2
0
X
-
O
V
E
R
|
H
z
VOLTAiR
120V DC Audio Rail
ON
LOW CUT
StereoMono
2412
PHASE
LOW MID-HI
ROLL-OFF | dB
Crossover
X-OVER
OUT
20HzOffOnOff
VU
MID-HILOW
Input
Active Crossover
0
1
8
0
5
0
6
0
7
0
8
5
1
0
0
1
2
0
X
-
O
V
E
R
|
H
z
P
H
A
S
E
|
Ø
°
VU
120
6
Var
-180°
Var
0°
Off
-
1
0
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–+
30 50 70 100
10 75 3 103
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VU
20
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%
–+
30 50 70 100
10 75 3 103
5
VU
L
O
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L
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L
|
d
B
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8
5
1
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1
2
0
X
-
O
V
E
R
|
H
z
VOLTAiR
120V DC Audio Rail
ON
LOW CUT
StereoMono
2412
PHASE
LOW MID-HI
ROLL-OFF | dB
Crossover
X-OVER
OUT
20HzOffOnOff
VU
MID-HILOW
Input
Active Crossover
0
1
8
0
5
0
6
0
7
0
8
5
1
0
0
1
2
0
X
-
O
V
E
R
|
H
z
P
H
A
S
E
|
Ø
°
VU
120
6
Var
-180°
Var
0°
Off
-
1
0
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5
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%
–+
30 50 70 100
10 75 3 103
5
VU
20
0
%
–+
30 50 70 100
10 75 3 103
5
VU
L
O
W
L
E
V
E
L
|
d
B
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