Referral Class Headphone Amp and Preamp with Phono Phase The NuPrime HPA-9 is a pure Class-An earphone amp and preamp that uses a no feedback output phase for low temporal distortion and realistic sound. The single-ended linear Class A design is capable of handling a wide variety of headphone impedances from 16 to 1000 ohm, making it suitable for almost any headphone make and model. Pure Class A Headphone Amp Design The HPA-9's pure Class An earphone amp style supplies sonic purity and supports up to three headphones all at once.
Single-ended JFET input stage circuitry
Zero feedback output stage design
Pure Class A headphone amp design
Phono (RIAA) input module: Internal setting to MM or MC
Maximum headphone impedance support range from 8 ohm a to 1 K ohm