Consumer gear operates at –10 dBV; professional gear at +4 dBu — an ~12 dB gap

Two nominal operating level standards coexist in audio. Consumer equipment (home stereos, prosumer synths, DJ gear) operates at a nominal –10 dBV (≈ 0.316 V RMS). Professional equipment (consoles, outboard processing) operates at +4 dBu (≈ 1.23 V RMS). The difference is approximately 11.8 dB. Connecting a consumer output directly to a professional input produces a signal that is ~12 dB too quiet; connecting professional output to consumer input produces a signal that is ~12 dB too loud and risks clipping. Level conversion (via a pad or a dedicated box) is required when interfacing equipment from different standards.

Examples

Feeding a DJ mixer’s –10 dBV outputs into a professional console’s +4 dBu line inputs results in a ~12 dB low-level signal requiring trim gain compensation. Many DJ mixers offer a +4/–10 output switch for this reason.

Assessment

A studio console running at +4 dBu is connected to a consumer recorder operating at –10 dBV without any level conversion. Predict the problem and the fix.