Description
Features
Power supply capacity of heavy material design: each channel is powered by a shielded toroidal transformer with a capacity of 300 watts of high power (maximum short-term power can reach 500 watts); 20000uF Dalian Wave Current imported ruby electrolytic capacitors; 4 discrete ultra-low noise power supplies are designed for the small signal part of the circuit
Manually fine-tuned differential stages, combined with high-quality components such as precision resistors and imported film capacitors; the circuit is simple in design, but transistors with particularly excellent linearity are used where the audio signal passes.
With the same level of performance, we use a low open-loop gain design to achieve low transient intermodulation distortion and obtain low transient intermodulation distortion; excellent listening experience;
High and low gain adjustment 16/23db; Support high and low gain adjustment Single-End balanced switching, double input switching, no mutual interference
Advanced speaker protection function: overheating switch, overload, DC protection
Lena –
TL;DR: No more what-if, the right power amps for my primary system.
As a music omnivore, I care my system is versatile and delivers enough fidelity for me to be with the music. I chose the Larsen 6.2 speakers because my voluminous medium size room sounds awful with conventional speakers. Two PSI AVAA C20s tame bass modes. Source is a Holo Cyan 2. I appreciate the Cyan 2 for its naturalness and NOS. I sometimes choose PC-based oversampling.
All my listening was with RCA cables from preamp to amps, ground lift switches engaged, and gain switches on low. Treble started out harsh and settled down after three days. Substituting inexpensive thick copper name-brand-imposter short power cables improved dynamics and bass. I wish when buying the amps to have had the option to pick different power cables.
I started out with the Sound Devices USBPre2 audio interface as a preamp. The sound was lively and enjoyable with adequate punchy bass. I needed to get a different pre to free up the USBPre2 for its intended purposes.
In came the Schiit Freya+. Passive mode lacked mid-bass and dynamics. Buffer mode improved bass. Active mode with tubes in the gain stage was pleasing, with thicker low-mid-bass. The treble blur the tubes introduced was obvious, a sign of how well the SA-90 communicates. All solid-state (LISST) active mode sounded ok. I preferred the solid-state sound of the USBPre2.
Out with the Schiit, in with SPL Phonitor X as a pre. Unrestricted dynamics startled me. Orchestral recordings evoked concert halls! Bass in electronic music defied the size of the speakers. Treble got ruthlessly clear. Sibilance had nowhere to hide. Well-recorded singers sounded wonderful.
Time will tell whether the Phonitor pushes dynamic expression, bass, and precision too far. For now, I am enjoying this setup a lot.
These are the quietest amps I have owned. If I put my ear to the tweeter, I sometimes hear EMI/RFI artifacts that plague appliances in my home. No hiss. When ambient noise is low, quiet music emerges from the noise floor of my hearing.
Considering the cost of these amps, I feel fortunate to get so much joy with them.