SPL SMC Surround Monitor Controller

Surround Monitor Controller

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SPL SMC Surround Monitor Controller

The SMC is the industry standard for 5.1 surround monitoring. It combines analog 6-channel volume control with speaker management for 5.1 surround and stereo sources.

Source Selection & Speaker Management

Two 5.1 and two stereo input sources can be connected to the SMC. This is important because, in monitoring, two productions are always compared.

The DB25 input is used to connect the DAW balanced. In output routing, channels 1-6 should be selected for 5.1 mixings and 7/8 for stereo mixing.

DVDs are often played back on standard DVD or Blu-Ray players for comparison purposes. Their consumer nominal level of -10dBV, which corresponds to a level difference of 7.8dB to the 0dBu studio level, is compensated in the SMC to make loudness comparable.

The front and rear stereo pair can each be switched to mono.

Mute All is important when the DAW sends full-scale audio garbage due to a problem. To protect the speakers and your hearing you can quickly mute them here.

Each loudspeaker can also be switched on/off individually.

The balanced inputs are passively looped through to the Slave Out DB25 socket. Here, for example, multi-channel metering can be connected.

The speaker outputs are balanced with TRS jacks. If mono jack plugs (TS) are used, the signal is automatically unbalanced.


Analog inputs & outputs; DB25 & TRS Jack (balanced), RCA

Maximum input gain
21 dBu
Input impedance (DB25 & Jack)
50 kΩ
Input impedance (RCA)
10 kΩ
Output impedance (Jack)
100 kΩ
Frequency range (-3 dB)
10 Hz – 100 kHz
THD +N (10 Hz – 22 kHz, 18 dBu)
0.002 %
Noise (A-weighted)
-98 dBu
Common mode rejection (1 kHz)
70 dBu
Dynamic range
119 dB

Internal Linear Power Supply with Toroidal Transformer

Operating voltage for analog audio
+/- 15 V
Operating voltage for relays and LEDs
+12 V

Mains Power Supply

Mains voltage (factory set)
230 V AC / 50 or 115 V AC / 60 Hz
Fuse for 230 V
T 315 mA
Mains voltage (selectable)
115 V AC / 60 Hz
Fuse for 115 V
T 630 mA
Power consumption
max. 10 W

Dimensions & Weight

W x H x D (width x height x depth)
272 x 91 x 220 mm
10.71 x 3.58 x 8.66 inch
Unit weight
2.3 kg
5.07 lbs
Shipping weight (incl. packaging)
3.25 kg
7.17 lbs

Reference: 0 dBu = 0,775V. All specifications are subject to change without notice.

Additional information

Weight 5 lbs
Dimensions 9 × 4 × 11 in