SPL argue there are technical benefits in using unbalanced (ie. Line Input 1 and Speaker Output A (plus the associated ‘sub’ output) are all balanced, while Line Input 2, Speaker Output B and the Line outputs are all unbalanced. The Marc One model supplements these facilities with a USB B‑socket for connection to a computer, tablet, or smartphone.Īll‑analogue connections are via quarter‑inch TRS sockets, but not all offer balanced operation. The rear‑panel audio connections comprise two stereo analogue line inputs, two stereo speaker outputs (one with a Sub output), plus a stereo line output. The coaxial power inlet is not a locking type and there’s no cable retainer either, but the power plug did remain securely in position during a week’s use on my desktop. Internal DC‑DC converters transmogrify the 12V supply into ☑7V rails for the audio circuitry, for a decent headroom margin. This is a Class‑2 power supply: there’s no direct connection between the monitor controller’s chassis or audio grounds and the mains safety earth, so ground loops shouldn’t be a problem, even with unbalanced connections. A supplied wall‑wart PSU accepts any mains voltage between 100 and 240 V AC, outputting 12V DC at 1.5A via a coaxial plug. They measure 210 x 50 x 220 mm and weigh around 1.5kg, so stay put on the desk well. Overviewīoth are desktop units with a vertical control panel on the front, and most signal and power connections plug into the rear the single headphone output is sensibly placed on the front. Both units also boast a good headphone amplifier, and a streamlined implementation of the crossfeed facility found on SPL’s Phonitor. Part of their Series One range, the Control One and the Marc One are almost identical but the Marc One also includes a USB connection and stereo A‑D/D‑A converters lots of monitor controllers have a D‑A and often USB connectivity to allow playback from a computer, but unlike most the Marc One can also serve as a two‑way line‑level audio interface. There are currently several affordable but good‑quality standalone monitor controllers on the market, but two recent additions come from the German manufacturer SPL. SPL combine their acclaimed headphone amps with monitor control facilities and USB audio interfacing.
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