![]() Most restaurants, bars and shops are located on Higuera Street, nearer the Mission and Cerro San Luis hotels are mostly located on Monterey Street, nearer the university but still within a mile of the central downtown. Cal Poly sits hard against Cuesta Ridge (with its big white "P") and the downtown area runs from Cerro San Luis roughly toward campus around two parallel streets, Higuera and Monterey. Both locals and visitors frequently refer to Cerro San Luis as "Madonna Mountain" and a common misconception is that the "M" represents the surname "Madonna " the famous Madonna Inn sits at the foot of the mountain and the city of San Luis Obispo negotiated public access to the peak with the Madonna family. The town clusters around the feet of the 1,000-foot Cerro San Luis, notably marked with a big white "M" (for Mission High School). San Luis Obispo is bounded by the imposing line of Cuesta Ridge to the northeast, the Irish Hills to the southwest, dramatic Bishop Peak to the northwest and Islay Hill to the southeast. San Luis and its neighboring communities boast extraordinary resources for hiking, mountain biking, sea kayaking, swimming and surfing outstanding natural beauty a carefully preserved and thriving 19th-century downtown centered around a meticulously restored 18th-century mission a small but thriving art gallery scene and a large and growing collection of top-quality wineries. ![]() Nestled around two of these peaks is San Luis Obispo ("SLO", "slow", or "San Luis" to locals), a small college town that also is one of California's oldest communities. San Luis Obispo Cerro San Luis (the hill for which the city is named) is on the right Understand Ībout half way between Los Angeles (200 miles to the south) and San Francisco (230 miles to the north), nine small but impressive volcanic peaks march down a valley of the Santa Lucia range to the Pacific Ocean. San Luis Obispo is a city in San Luis Obispo County in the Central Coast region of California. The Red varies between 94dB to 106dB depending on the quality of the USB hub. In practice AQ's new 5V line conditioning is so successful that the S/N, when driven via a 'clean' USB hub like the Melco N10 or a noisy PC, is unaffected at a massive 110dB (A-wtd). But the real headline is tucked away in the small print: 'Improved PSU filtering increases immunity to WiFi, Bluetooth, and cellular noise'. Jitter is still very low at <20pec (unloaded) thanks largely to the excellent rejection of the ESS DACs and 'StreamLength' USB transfer protocol. This, the usefully low sub-0.5ohm output impedance and 53mW/25ohm power output are unchanged because the Cobalt uses the same ESS 9601 headphone amp as the Red. Thus AQ's Cobalt may offer a slightly different tonal colour even though harmonic distortion is unchanged over the Red – 0.02-0.05% at the same 2.18V maximum voltage output, falling to a minimum of 0.0025% over the top 30dB of its dynamic range. Stopband rejection is poorer too at just 40dB but ringing and phase distortion are much reduced. So the Red has a flatter response of +0.1dB/20kHz (44.1kHz/48kHz media) and –0.85dB/45kHz (96kHz media) while the Cobalt rolls-off to –2.0dB/20kHz and –8.45dB/45kHz, respectively. Yes, the Cobalt uses an ES9038 DAC in place of the Red's ES9010 and with the slow roll-off mode of the minimum phase digital filter selected. While the Cobalt represents the most significant update on AQ's DragonFly series, this is not for the 'headline' reasons you'll probably read about elsewhere.
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