User manual SOUNDCRAFT ABSOLUTE 4P

[. . . ] In contrast, Absolute 4Ps achieve true phase linearity by the use of Spirit's active VCS crossover which electronically `aligns' the drivers. ABSOLUTE COMPATIBILITY 4Ps cater for both professional and semi-pro connections, and can be used with a wide range of input sources such as mixers, CD Players, and DAT machines. Industry standard XLR connectors handle balanced signals (+4dBu) while gold-plated phonos take care of unbalanced sources (-10dBV). [. . . ] Further accurate left/right channel matching is assured by the stepped input level controls. Input Waveform Non Phase Linear System (low frequencies lag behind) Absolute 4P Phase Linear System ABSOLUTE SOUND QUALITY To achieve Trevor Stride's design brief of a natural, uncoloured sound, 4Ps use bass cones custom-made from HD-A (High Definition AerogelTM). This remarkable new composite exhibits very high internal damping, high rigidity and low mass. Being lighter and more rigid than standard paper designs, 4P's cones are at least 2dB more efficient and very low in colouration. Furthermore, Trevor chose ferro-fluid cooled soft dome drivers instead of metallic tweeters which can create unwanted spurious HF resonances. Flat response is maintained off-axis by the newly designed tweeter face plates, and the edges of the substantial 18mm MDF cabinet are radiused to help prevent HF refraction and interference. MAIN FEATURES High definition linear phase design Flat on- and off-axis frequency response Custom designed magnetically compensated drivers Long throw AerogelTM 170mm LF driver 25mm ferrofluid-cooled soft dome tweeter Vented cabinet with large flared port, for extended low frequency response, even at high levels Integral low distortion 100W (LF) and 100W (HF) power amplifiers, with full protection/limiting for both drivers and amplifiers Constant voltage active crossover, with time compensation for driver alignment Stepped input level control for accurate setup Switched 40Hz HPF allowing higher sound levels from bass-heavy music signals XLR connector for balanced signals, RCA phono-type sockets for unbalanced signals ABSOLUTE PROTECTION 4Ps are protected by a `zerocolouration' active circuit, that has no adverse effect on sound quality, and which continuously monitors operating status by simulating drive unit power dissipation. Any signal approaching danger level will be progressively limited by precision electronic attenuators, without affecting transients. Thanks to the versatility of the active system, HF response is extremely flat with superb dispersion; the 30° off axis response extends to 17kHz. Because of the wide dispersion angle of the tweeter, the cabinet design has large radii on all edges to minimise edge diffraction effects. For absolute flexibility, the 4Ps may be used in a vertical or horizontal position, the latter being accomplished by simply rotating the internal amplifiers through 90°. Two 100 watt amplifiers in each enclosure make Absolute 4Ps the most powerful active monitors in their price class - but that wasn't the prime objective. The use of an active VCS crossover, coupled with 100 Watt HF Amp dedicated drive to the LF and HF units, enables the frequency response characteristics of the Tweeter system to remain flat at all Active Phase Linear levels. Built-in protection VCS Crossover circuitry also works together Woofer with the amplifiers to provide a constant safeguard. A switchable 40Hz High Pass Filter allows 100 Watt LF Amp accurate, high level monitoring of bass-heavy music signals as well as simulating the response of typical `hifi' speakers dB to facilitate home 100 studio mixing. 90 80 SPECIFICATIONS Amplifier Power Output: Frequency response (half space on axis): Crossover (constant voltage, linear phase): Efficiency (half space): Driver complement: Dimensions (HxWxD): HF ­ 100 Watts RMS LF ­ 100 Watts RMS 40Hz - 22kHz, -3dB 2. 4kHz 115dB max SPL @ 1m 170mm LF/25mm HF 395 x 240 x 330mm 15. 5 x 9. 5 x 13" Weight: 13. 8kg (30. 5lbs) each 70 60 50 10 50 100 500 1k 5k 10k 20k Hz Spirit by SoundcraftTM, Harman International Industries Ltd. , Cranborne House, Cranborne Industrial Estate, Cranborne Road, Potters Bar, Hertfordshire EN6 3JN, England. [. . . ] A switchable 40Hz High Pass Filter allows 100 Watt LF Amp accurate, high level monitoring of bass-heavy music signals as well as simulating the response of typical `hifi' speakers dB to facilitate home 100 studio mixing. 90 80 SPECIFICATIONS Amplifier Power Output: Frequency response (half space on axis): Crossover (constant voltage, linear phase): Efficiency (half space): Driver complement: Dimensions (HxWxD): HF ­ 100 Watts RMS LF ­ 100 Watts RMS 40Hz - 22kHz, -3dB 2. 4kHz 115dB max SPL @ 1m 170mm LF/25mm HF 395 x 240 x 330mm 15. 5 x 9. 5 x 13" Weight: 13. 8kg (30. 5lbs) each 70 60 50 10 50 100 500 1k 5k 10k 20k Hz Spirit by SoundcraftTM, Harman International Industries Ltd. , Cranborne House, Cranborne Industrial Estate, Cranborne Road, Potters Bar, Hertfordshire EN6 3JN, England. Fax: +44 (0)1707 665461 Spirit by SoundcraftTM, 11820 Kemper Road, Auburn, CA. [. . . ]