BOSC monoblock audio power amplifiers were conceptualized to provide the listener with a truly life-like musical experience, presented with every significant detail intact, in order to convey an emotional connection to the music.
BOSC amps use the latest state-of-the-art electronics, including gallium nitride (GaN) technology to achieve ultra-high performance in an easy-to-use small package that will blend into any decor.
Awkward packaging... Yes, but with good reason. The amps are made small and with connectors on opposite sides, allowing you to place the amplifier right behind the speaker. This has multiple benefits:
GaN provides the following sonic/sound quality benefits over traditional silicon transistors:
This is because GaN transistors have much better characteristics over their silicon counterparts:
Amplifier performance is improved by the use of GaN technology:
You read that right. BOSC is an analog switching amplifier. The "d" in class d does not mean digital.
The pulse-width modulation (PWM) is performed completely in the analog domain and is then amplified by the GaN power stages.
This sets BOSC apart from its counterparts that use digital modulation techniques using FPGAs, DSPs, and processors.
BOSC amplifiers use my proprietary DC coupled, fully balanced dual feedback modulator. This allows the amplifier to be completely balanced from input to output, though the use of bridged GaN power stages.
GaN technology enables BOSC to switch at ~800kHz which is 2-3 times faster than traditional class d amplifiers using silicon transistors. This very fast switching allows for the use of a single-pole LC (inductor and capacitor) filter, which both attenuates the switching frequency by 40dB and allows the amplifier to have no phase shift from DC (0Hz) to 30kHz.
The filter is a very important part of a class d amplifier. BOSC uses oversized very high-quality oxygen-free copper (OFC) inductors and a very high-grade film capacitor.
Having high-quality components will only get you so far; BOSC’s 4-layer PCB is state-of-the-art. It uses a custom stack-up with high-end dielectric material and ENIG (gold) finish.
"Leo's little guys, boasting the newest GaN (gallium nitride) transistors and modestly priced at $1500 for the pair, lit up the music room."
"...dynamic, well defined deep bass, excellent staging, imaging and resolution throughout. All this was maintained through demanding crescendos, with airy upper ranges, while conserving the subtleties of decay- especially welcomed on pizzicato and percussion segments."
"Personally, I'm certainly leaning towards making amps such as BOSC the last ones I'll ever own."
"No matter what sort of music I played from acoustic jazz to Americana-folk to electronic progressive rock, whether my own minimally miked uncompressed recording or highly produced loud studio rock the amplifiers did exactly what they were supposed to, noiselessly, without stress or strain, and in a perfectly transparent way."
"The top end, there is a lot of clarity."
"When it comes to instrument separation, it is fantastic."
"I wanted to stop my heart so I could hear the music better. I was being sucked in, pushed out, and unable to focus on anything else but the music. There were all the little bird-like chimes, dancing between clicks and pings and bongs of xylophone harmonics with dry reed raspy sounds zooming in and out, floating on top of deep rolling strings and organ-like bass. I didn’t want to miss a moment of it."
" I found them very dynamic, very musical, and beautifully detailed in the top end. The tone was better than in many transistor amps. The same could be said about emotional involvement. Listenability was very good with a relaxed and detailed sound. The soundstage and imaging were also very good. "
"I immediately noticed a major drop in high frequency noise and a swathe of new air and space within the midrange which pushed open the soundstage, expanding it left and right. All of the reconstruction work of the soundstage created a new level of clarity and transparency."
"Sound quality is quite sublime for the price, detail, character, clarity, it’s all there. A fascinating power amplifier and definitely one to investigate."
*THD - Total Harmonic Distortion
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