Unika REFERENCE RHA1 User Manual

4UNiKAUser ManualPRODUCT OVERVIEWThe RHA1 is a reference-grade headphone amplifier carefully developed by UNiKAand manufactured in the UNiKA factory in Taiwan. The application object of RHA1 isheadphone enthusiasts, audiophiles and professional recording engineers and liveconcert soundman.Especially using only 24V external power supply and classic OTL amplifier circuitdesign, its performance is amazing.RHA1 is suitable for general consumer headphones, as well as reference-grade andlow-sensitivity high-end headphones. Impedances from 15ohm to 600ohm are easilydriven and produce a very smooth and very dynamic sound. Moreover, it performs veryhigh S/N ratio and cannot be perceivedpower supply and circuit characteristic noise.It can be seen from the test chart (please scan the QR code on the last page todownload), we can see that the frequency response of the RHA1 is very flat from 20Hzto 80KHz, and the full-band frequency response error value is not greater than ±0.2dBin the test from low impedance to high impedance.The most special feature is its specially designed ±18dB linear gain and post-amplevel control with maximum 0dB output. This design is like using a professional mixingconsole. Users can first use its linear gain to adjust to the optimal input level anddynamics according to headphones or signal sources with different characteristicsor impedance and sensitivity, and then use the output level control to determine thevolume you need to listen.This design greatly exceeds some products currently on the market with fixed gainvalue switches.The components selected by RHA1 are all top-level models, and a double-connectedstereo potentiometer with very low L/R output different is specially customized toensure listening consistency.The amplification of the output stage adopts the independent amplification of the L/Rchannel, which greatly improves the separation and minimizes the crosstalk.The input jacks are a pair of NEUTRIK® Combijack. It can be availableto connectXLR and TRS balanced plug or TS unbalanced plug from recording devices or Hi-Fiequipment.At the same time, UNiKA is very considerately equipped with an external power supplyof adaptiveUniversal Input Range 90~264VAC and comes with 4 kinds of AC plugs thatcan be interchangeable by user, including US, UK, AU and EU types.