Koenigsegg Automotive AB is a Swedish manufacturer of high-performance sports cars based in Angelholm. The company was founded in 1994 in Sweden by Christian von Koenigsegg, with the intention of producing a world-class supercar. Many years of development and prototyping led to the company's first street-legal production car delivery in 2002. Norwegian designer and entrepreneur Bard Eker bought a 45 percent share in the company in late 2005, and is currently the largest owner with 49 percent. Christian von Koenigsegg owns 18 percent, and the balance of the stock is held by some 90 small investors. The Koenigsegg CCX is a mid-engined roadster from Swedish car manufacturer Koenigsegg. The CCX has been engineered to comply with the U.S. regulation and market demands[2] and is a newer design that replaced the Koenigsegg CCR. CCX is an abbreviation for Competition Coupe X; the X commemorating the 10th anniversary, (being the Roman numeral for ten), of the completion and test drive of the first CC vehicle in 1996. The CCX was first unveiled on February 28, 2006 at the 2006 Geneva Motor Show although its existence was announced earlier. A derivative known as the CCXR is available, the main difference being that CCXR's engine is tuned to run on biofuel. The different fuel and tune allows the CCXR to produce 25% more power than the CCX. Koenigsegg began the CCX project with the aim of entering the world market, though particularly the United States car market.[6][7] Development engineer Magnus Jaasund said "We wanted to go into the world market, but we couldn’t do it with the old car." To sell cars to the North American market many alterations were made to the design of the CCR; the previously used Ford Modular engine was replaced by a Koenigsegg engine designed to run on 91 octane fuel, readily available in the United States, and to meet the Californian emission standards.[6][8] The front bumper of the CCX is designed to be safer in low speed collisions than previous Koenigseggs and the whole body is 3.46 in (88 millimeters) longer to comply with the United States' rear impact regulations. Additionally the CCX can display United States or European number plates. The CCX is 1.6 in (40.6 mm) taller than the CCR and, combined with the carbon fiber reinforced plastic sports seats by Sparco, the CCX allows for 2 in (50.8 mm) of extra headroom that Autoweek reviewer Mark Vaughn hypothesizes is "to accommodate U.S. NBA stars.” The electronic control unit has also received an upgrade over the CCR meaning that the CCX is without physical fuses and it is lighter than the previous system. The CCX can accelerate from 0–62 mph (100 km/h) in 3.2 seconds and from 0–124 mph (200 km/h) in 9.8 seconds. According to Koenigsegg it has a top speed of 259 mph (417 km/h), although this has not been officially verified. On 15 June 2008, a standard fully equipped CCX was independently timed by sport auto in achieving a record 0-186-0 mph (0-300–0 km/h) in 29.2 seconds, beating out the Mercedes-Benz McLaren SLR 722 Edition, the Lamborghini Murcielago LP640, the Porsche 997 GT2, the Alpina B6 S (based on the BMW 6 Series), and the Corvette Z06. The engine of the CCX was thoroughly re-engineered by Koenigsegg themselves and is assembled at the Koenigsegg factory, though it is still based on the Ford Modular architecture. [12][13] The engine block is cast for them by Grainger & Worrall, a British company that produces drivetrain components for Formula One cars. The engine is a 4.7 liter 288 cu in (4,719 cc) V8, with dual overhead camshafts and 4 valves per cylinder. The engine block is made of 356 Aluminium that has undergone a T7 heat treatment, a form of accelerated precipitation strengthening.[8][16] The aluminium alloy is stronger than the previous engine and allows a thinner, thus lighter, engine block that will withstand higher cylinder pressures. The engine is boosted by two centrifugal superchargers that provide 17.5 psi (1.2 bar) of boost with an 8.2:1 compression ratio. The engine produces 806 bhp (601 kW; 817 PS) at 6900 rpm and 678 lb·ft (919 N·m) of torque at 5700 rpm on 91 octane (U.S. rating) gasoline. The engine is lubricated with a dry sump system with a separate oil pump, the pistons are cooled by oil sprayed onto them and the oil itself has an external cooler. The CCX does 14 mpg (17 l/100km) in combined cycle and 18 mpg (13 l/100km) in highway travel. In 2007, the CCX was the fastest car to complete a lap of the BBC Top Gear circuit, in a time of 1:17.6 on the Power Lap, until it was beaten by the Ascari A10 with a time of 1:17.3. The car originally lapped the circuit in 1:20.4, but was then fitted with a non-standard rear spoiler to provide downforce after the show's test driver (The Stig) spun the original version off the track. The Stig purportedly recommended this modification, predicting that the car would then be the fastest ever round Top Gear's track but Koenigsegg later stated that the improv

It seemed like there was too much treble, so I did a few mods. Soldered the following in parallel with the existing components (on top of the PCB), i.e. doubling the values, in the hope of improving its bass response a bit: C9 10nF C4 22uF C2 22uF While I was there I put another 1M in parallel with R17, to boost what was going to the output stage, so it would distort there earlier (rather than just in the preamps). Net result - can't really be objective, but does sound better balanced. (As usual I rushed it, didn't really do a proper 'before' listen). Definitely got good control over which stage is doing the distorting now. Unfortunately with no input there also seems to be a bit more quiescent hum than before (which I guess would be the case with better response at 50Hz), but it's well down on the level of a signal through it.