About the [Pre-Sale] Douk Audio VU3-PLUS:2‑Way Amplifier/Speaker Selector with Accurate Power VU Meter
From the product page on doukaudio.com.
Next-Generation VU Metering: For listeners who love the sweep of large analog meters but want more practical value, VU3-PLUS answers that need. It carries forward VU3-PRO’s signature visual appeal, flexible amp/speaker switching and effortless control, while adding precise power monitoring and higher power handling for demanding HiFi systems.
See What Your Amplifier Delivers: Shows actual amplifier output as clear, accurate watt readings for volume adjustment, speaker pairing and gear comparison. Select 2 / 4 / 6 / 8Ω based on speaker load for greater accuracy. 0 / +20dB gain covers a 0.01mW–1000W power measurement range without altering the sound. AVE shows steadier average output, while PEAK captures fast transient peaks.
More Flexible Listening Setups: As a selector/splitter, it keeps two amplifiers and two pairs of passive speakers connected without repeated rewiring. Switch between amps and speaker pairs for quick system changes and A/B comparisons, with the option to keep both speaker pairs active when needed. A built-in 510Ω protective load safeguards the unselected amp during switching.