This bundle includes two Audio Maintenance 54F50 and two Audio Maintenance ez1073‐500 in a modified API VPR 500 rack with linking switches The Audio Maintenance 54F50 is a 3-slot 500 Series Class A hand-built British compressor/limiter derived from the Neve 2254 design. Carnhill transformers used throughout, the Audio Maintenance 54F50 is built to the highest spec with only the finest components used in the manufacture. Capable of offering the sound and performance of the undoubted classic from which it is derived, the 54F50 from Audio Maintenance is built to an uncompromisingly high standard and as such represents great value for money. With such care and attention to the details, the 54F50 is the perfect way to control the dynamics of your music and at the same time take the revered compression and limiting capabilities previously only offered in console units now long defunct and largely unavailable - not to say unaffordable as well, in many cases. By making and sourcing parts for old equipment, as well as producing DIY kits and hardware, Audio Maintenance has gone out to uphold the values and standards that have made the original equipment so collectible today - now with the Audio Maintenance 54F50 you can own a future classic. Audio Maintenance 54F50 Overview: • Classic 4 stage (Class A) amplifier, 4 transformer design • All discrete component (no surface mount devices) • Entirely hand assembled and tested in the England to exacting quality standards. • Line Input: Carnhill transformer balanced (Mu-metal screened Classic VTB9046), 10k Input Impedance • Interstage: Carnhill Mu-metal screened Classic VTB9045 and VTB9046 • Line Output: Carnhill transformer balanced (Classic full size output transformer) • Compressor: (Class A) amplifier design • Ratio 1.5:1, 2:1, 3:1, 4:1 & 6:1 • Dual attack speeds (Fast = 5mS, Slow = 25mS) * • Make-up gain 0dB to 20dB in 2dB steps • Recovery (release) 400mS, 800mS, 1.6S & Auto • Threshold –20dBu to +10dBu • Limiter: (Class A) amplifier design • Dual attack speeds (Fast = 100uS, Slow = 5mS) * • Recovery (release) 100mS, 200mS, 800mS & Auto • Threshold +4dBu to +12dBu (in 1dB steps) • Stereo link via either the backplane edge connector, an XLR or both • Illuminated meter selectable for input, output or gain reduction metering. • Power off signal bypass • Entirely stainless steel chassis. • Total current consumption 150mA (per unit) • Also available supplied as a pair in a box containing a “mono/stereo” switch The Audio Maintenance EZ1073-500 module is a dual-slot mono 500 Series hand-built Class A preamp and EQ module inspired by original 1073 unit. Hand-made in Britain, the Audio Maintenance EZ1073-500 offers exceptional quality and a great sounding preamp and EQ for your 500 Series rack. Not surprising when you consider that it is derived from the legendary Neve 1073, but surprising when you read the comments by users that rate it alongside the original units. To do that, Audio Maintenance built the EZ1073-500 with the finest components it could source, including the large output transformer, previously seen as a bar to making a 500 Series version - the microphone and line inputs have their own separate circuits too, including transformers - the Carnhills used throughout the EZ1073-500. The EQ section is comprehensive and it comes with phantom and phase reversal switches. The quest for sonic nirvana is a restless one and fashions come and go, but the pursuit of classic Neve-type EQs seems never-ending and the Audio Maintenance EZ1073-500 is destined to soon become a classic in its own right. Audio Maintenance EZ1073-500 Overview: • Classic 3 stage (Class A) amplifier design • All discrete component (no surface mount devices) • Entirely hand assembled and tested in the England to exacting quality standards. • Mic Input: Carnhill transformer balanced (Classic VTB9045) +10dB to +65dB gain, rotary switchable in 5dB steps and switchable 300/1200 Ohm impedance input. • Line Input: Carnhill transformer balanced (Classic VTB9046) - 20dB to +20dB, rotary switchable in 4dB steps (centre 0dB), 10k Input Impedance • Line Output: Carnhill transformer balanced (Classic full size output transformer) • EQ/Filter Stage: 3 inductor (Class A) amplifier design • HF (12kHz) +/- 16dB gain continuously variable • MF (switchable; 360Hz, 700Hz, 1.6kHz, 3.2kHz, 4.8kHz & 7.2kHz) +/- 16dB gain continuously variable • LF (switchable; 35Hz, 60Hz, 110Hz & 220Hz) +/- 16dB gain continuously variable • Low Pass Filter (switchable; 50Hz, 80Hz, 160Hz & 300Hz) -18dB per Octave • Phantom and polarity switches • The XLR behind the left hand side is the Mic Input • The XLR behind the right hand side is the Line Input • The output is duplicated on both of the output XLRs • Stainless steel chassis • Total current consumption 110mA (per unit)