SPL Control One

You can monitor your production via two switchable speaker pairs. A subwoofer is also switched on and off with speaker pair A.

When the switch is in the centre position, the speakers are switched off, which is practical because you don't have to turn the volume control back.

Two analogue stereo inputs can be connected to the Control One for players such as DA converters, CD players, mixing consoles, synthesizers or analogue tape machines/tape decks, which can also be mixed together (1+2).

The selected input signal is output unchanged at the Line Out. This means that the Control One can be looped between devices without "losing" an output.

If, for example, several people are to listen in via headphones, a headphone amplifier can simply be connected to the Line Out.

You can also record the signal in analogue form or send it to a mixer for further processing.

The Control One offers three monitoring modes. The default setting in the centre is "Stereo". To check the mono compatibility, set the switch to "Mono". The special feature is the channel swap function: L/R > R/L

reverses the stereo image. L/R becomes R/L. This is particularly important and extremely time-saving if you are looking for samples in the video dubbing that should match a scene with a direction of movement.

If the direction is not correct, you normally have to load the sample into the DAW for channel swapping and swap the channels there before you can hear whether the sample fits.

With the L/R > R/L function, this is no longer necessary. You can now swap the direction of movement in the sample library during pre-listening.

The output stage of the headphone amplifier is designed as a push-pull amplifier in Class AB operation. The bipolar transistors share the amplification of the positive and negative half-wave, which produces a higher amplification and a higher output voltage than in Class A operation, in which only one transistor amplifies both half-waves.

The output stage transistors are thermally coupled and therefore run particularly coherently, which contributes to a consistent and stable sound image.

The power supply has a buffer circuit with low source resistance and thus ensures generous current reserves even when operating low-impedance headphones.

The Phonitor Matrix has three setting parameters in the largest configuration: Crossfeed, Speaker Angle and Centre Level.

In Control One, the centre level is preset to -1 dB and the speaker angle to 30°. These are the most commonly used values.

The crossfeed function determines the crosstalk between the channels, the so-called interaural level difference. The intensity of the crossfeed is infinitely variable.

At the beginning of the control path, the function is not in the audio path. It is only activated by adding it via a relay (hysteresis circuit). The audio signal therefore does not pass through the crossfeed stage if this is not desired.