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What is stereo?
There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.
H.H. Scott '59
dbx Encoded Discs
Carver SD/A 410
Lenco L 75/S (1976)
Tuttosommato si tratta di un prodotto spartano ma caratterizzato da una incredibile robustezza ed affidabilità, con un coperchio di buona fattura e le cerniere a frizzione.
Velocità: 33 e 45 giri/minuto
Trazione: a pullegia
Wow & Flutter: 0,008% (non pesato), 0,005% (pesato)
Rumble & Hum: 40 dB
Raporto S/N: 60 dB
Piatto diametro: 315 mm
Piatto peso: 4,0 kg
Braccio "S": 280 mm
Dimensioni: 445 x 335 x 155 mm
Diapason Reference Series
Front-ported centre-speaker, grants excellent results in voice reproduction, is a functional element in a multi-channel system, matching with Adamantes III N.W. and Karis N.W.
Diapason Ástera
Klipsch - Corner Horn Loudspeaker Systems
Technics SU-9011 (1978)
Stereo preamplifier TECHNICS SU-9011
Input sensitivity/impedance;
Phono1 man-month: 2.5 mV / 47 kohm
Phono1 MC: 70 microvolts/ten ohms
Phono2 man-month: 2.5 mV / 47 kohm
Tuner, Aux: 150 mV / 47 kohm
Tape1, 2, Playback: 150 mV /47 kohm
Mic: 4 mV / 10 kohm
Phono maximum permissible input (1kHz, RMS):
Phono1 MM: 200 mV
Phono1 MC: 6 mV
Phono2 MM: 200 mV
Rated THD: 0.008%
S/N ratio (IHF-A):
Phono1 MM: 88 dB
Phono1 MC: 80 dB (at the time of a 250-microvolt input), -152dBV (input conversion)
Phono2 MM: 88 dB
Tuner, Aux: 100 dB
Mic: 73 dB
THD (20 Hz - 20,000 Hz):
Tuner, Aux: 0.005% (5 V output, Volume 0 dB), 0.008% (1 V output, Volume -30 dB)
Phono1, 2 man month: 0.008% (5 V output, Volume 0 dB), 0.01% (1V output, Volume-30dB)
Phono1 MC: 0.03% (5 V output, Volume 0 dB), 0.02% (1V output, Volume-30dB)
Frequency characteristic:
Phono1, 2: RIAA standard curve ±0.2 dB
Tuner and Aux: 20 Hz - 20,000 Hz +0 -0.2 dB, 2 Hz - 120 kHz +0 -3 dB
Tone control; Bass: ±8 dB (50Hz), Treble: ±8 dB (20kHz)
Subsonic Filter : 30 Hz - 12 dB / oct
A high filter: 7 kHz - 6 dB / oct
Loudness control (-30dB): +8 dB(100Hz)
An Output voltage/impedance;
Output: 1 V/600 ohm (rate), 5 V/600 ohm (maxima)
Mixing rec out: 1 V/600 ohm (rate), 5 V/600 ohm (maxima)
Tape1, 2 rec out: 150 mV
Power source: AC 100 V, 50/60 Hz
Power consumption: 13 W
Dimensions (W x H x D): 430 x 97 x 285 mm
Weight: 4.5kg
Technics SE-9021 (1978)
Stereo Power Amplifier TECHNICS SE-9021
General specifications
System: Transistor Power Amplifier
Speaker Outputs: 4 Speakers, Phones
Effective output: 60 Watts per channel at 8 ohms
Frequency Response: 0 - 150.000 Hz +0 -3 dB, 20 - 20,000 Hz +0 -1 dB
Harmonic Distortion: 0,01 % at rated output
Cross Modulation Distortion: 0,01%
S/N Ratio: 115 dB (IHF-A)
Imput sensitivity/ impedance: 1V/ 47 kohm
Dumping Factor: 100 (at 8 ohms)
Load impedance: 4 - 16 ohms
Physical specifications
Power source: AC100 V, 50/60Hz
Power consumption: 140 W
Dimensions (W x H x D): 430 x 97 x 331 mm
Weight : 9,7 Kg
Luxman D-103u (1988)
Il D-103 è il uno dei tre primi lettori CD che Luxman ha prodotto durante anni ottanta, e che ha offerto agli amanti della musica l'uso di stadi d'uscita a valvole, per dare il meglio della riproduzione musicale.
DAC quantization: 18 bits Twin D/A Burr Brown PCM1701P
Digital Filter Over Sampling Frequency: 352,8 kHz
Digital Output: EIA-J Digital Output
Phones output with volume control.
Vacuum Tubes Type: 6CG7
Frequency response: 5Hz-20 kHz /±1,0 dB
Dynamic Range: 92 db /30 kHz LPF, IHF-A
S/N ratio: 105 dB /30 kHz LPF, IHF-A
Channel Separation: 90 dB /1 kHz BPF
Wow and Flutter: Below measurable limits
THD: 20 Hz to 20 kHz, 1 kHz BPF: 0,05%
Output voltage/Impedance:
Fixed: 2,0 V/1,2 kohm
Variable: 0 to 2,0 V/1,2 kohm
Dimensions: 438 x 138 x 349 mm (W x H x D)
Weight: 8,5 Kg
Lowther PM6, PM4, PM2
For the finest sound in the world.
Basically , Lowther design has remained constant from the start since these units function on natural sonic principles which cannot be bettered. But through research, new materials and remarkably improved engineering techniques, Lowther drive units provide fantastically good performance whatever the sound source. These units are intended for use in internal folded-horn cabinets, the designs of which make electrical cross-over systems unnecessary.
Abridged technical specifications of Lowther Drive Units PM6, PM4 AND PM2 are given overleaf.
LOWTHER PM6
Overall Diameter: 228 mm
Overall Depth: 76 mm
PDC Mounting Centres: 208 mm
Baffle hole cut-out: 190 mm
Voice Coil Diameter: 38 mm
Voice Coil Impedance: 8 ohms
Air gap width: 1 mm
Magnet Type: Feroba 2
Flux Density: 1,7 Tesla (17000 gauss)
Flux energy gap Joules x 10³: 705 MJ
Diaphragm: Twin-paper
Frequency response: 20 - 20,000 Hz
Nominal free air resonance: 39 Hz
Sensitivity dB 2 x 10 ⁵ N/M²: 94 dB
Effective Moving Mass: 0,012 kg
Suspension compliance: 1,26 x 10³ M/N
Voice coiltravel: ±1mm
Shipping weight: 3 kg
LOWTHER PM2
Overall Diameter: 228 mm
Overall Depth: 92 mm
PDC Mounting Centres: 208 mm
Baffle hole cut-out: 190 mm
Voice Coil Diameter: 39 mm
Voice Coil Impedance: 8 ohms
Air gap width: 1 mm
Magnet Type: Feroba 2
Flux Density: 2,0 Tesla (20000 gauss)
Flux energy gap Joules x 10³: 976 MJ
Diaphragm: Twin-paper
Frequency response: 20 - 20,000 Hz
Nominal free air resonance: 39 Hz
Sensitivity dB 2 x 10 ⁵ N/M²: 95,5 dB
Effective Moving Mass: 0,012 kg
Suspension compliance: 1,26 x 10³ M/N
Voice coiltravel: ±1mm
Shipping weight: 4 kg
LOWTHER PM4
Overall Diameter: 228 mm
Overall Depth: 102 mm
PDC Mounting Centres: 208 mm
Baffle hole cut-out: 190 mm
Voice Coil Diameter: 30 mm
Voice Coil Impedance: 8 ohms
Air gap width: 1 mm
Magnet Type: Feroba 2
Flux Density: 2,4 Tesla (24000 gauss)
Flux energy gap Joules x 10³: 1400 MJ
Diaphragm: Twin-paper
Frequency response: 20 - 20,000 Hz
Nominal free air resonance: 39 Hz
Sensitivity dB 2 x 10 ⁵ N/M²: 97 dB
Effective Moving Mass: 0,012 kg
Suspension compliance: 1,26 x 10³ M/N
Voice coiltravel: ±1mm
Shipping weight: 6 kg
The above units have a power handling capacity up to 60 watts when suitably housed and may be used with amplifiers up to 100 watts outputper channel.
Tannoy Dual Concentric Loudspeaker System
This twin Loudspeaker system consist of a direct radiator low frequency unit mounted concentrically with a horn-loaded high frequency unit. The voice coils of both loudspeaker systems are fed through a specially designed cross-over network. The frequency response of both units is intrinsically level and the wide frequency response is not obtained by trick effects, such as cone break-up or diaphragm resonance. The desigh of the low frequency cone, which forms the final section of the high frequency horn, is such that even distribution of high frequencies is odtained over a wide angle and in order that the low frequency diaphragm shall move as a truepiston, the body thickness has been increased and the surround is specially treated to prevent the setting up of subsidiary resonances.
The high frequency unit is of particularly robust construction to ensure adequate power handling capacity and to enable it to take over from the L.F. unit at a sufficiently low frequency to avoid the latter's running into break-up troubles. The diaphragm is a light alloy pressing located to within very close limits on the backplate by means of a turned recess. An aluminium voice coil conductor is used in order to preserve the correct mass relationship and phase matching arrangement to ensure a level and extended high frequency response. The first section of the H.F. horn is formed from the center pole and is continued by the L.F. cone.
In the design of this loudspeaker, great care has been taken to ensure that the entire system is truly apperiodic which, together with its wide frequency range result in really outstanding reproduction.
This Loudspeaker unit isavailable in two forms - a 15" version, capable of handling up to 25 watts which is particularly useful for use with high quality Sound Reinforcement systems and 12" version capable of handling up to 15 watts, which finds itsmain application in high quality Phonograph and Radio reproducing systems. An example of a suitable Cabinet design for the latter application is shown above and takes the form of a corner mounting Bass Reflex Cabinet.
There is no doubt that where the input source is of sufficiently high quality, the Tannoy Dual Concentric Loudspeaker system is well in advance of any type of loudspeaker hithertto commercially available
TECHNICAL SPECIFICATION
12" Dual Concentric Loudspeaker
Frequency response: 25 - 20,000 Hz
H.F. Voice coil diameter: 2"
L.F. Voice coil diameter: 2"
H.F. Voice coil impedance: 14 ohms at 3000 Hz
L.F. Voice coil impedance: 18 ohms at 400 Hz
Flux density L.F. Gap: 10,000 gauss, B± L± 6-3 x 10¹⁴
Flux density H.F. Gap: 15,000 gauss, B± L± 1-1 x 10¹⁴
Power handling capacity: 15 watts
Impedence via crossover network: 18 ohms
Polar distribution: -3 dB at 10,000 Hz for 60⁰ inc. angle
Intermodulation produces: less than 2 %
Bass resonance: 35 Hz
Crossover frequency: 1,700 Hz
Overall Diameter of Frame: 12⅜ "
Overall Depth: 7½ "
Fixing Holes p.c.d.: 11¾ "
Weight: 10 lbs (Crossover network on separate chassis)
Finish: Black Anodised and Cadmium plate
15" Dual Concentric Loudspeaker
Frequency response: 23 - 20,000 Hz
H.F. Voice coil diameter: 2"
L.F. Voice coil diameter: 2"
H.F. Voice coil impedance: 12 ohms at 2000 Hz
L.F. Voice coil impedance: 12 ohms at 400 Hz
Flux density L.F. Gap: 12,000 gauss, B± L± 7-7 x 10¹⁴
Flux density H.F. Gap: 18,000 gauss, B± L± 1-39 x 10¹⁴
Power handling capacity: 25 watts peak
Impedence via crossover network: 15 ohms
Polar distribution: -4 dB at 10,000 Hz for 60⁰ inc. angle
Intermodulation produces: less than 2 %
Bass resonance: 40 Hz
Crossover frequency: 1,000 Hz
Overall Diameter of Frame: 15¼ "
Overall Depth: 9 "
Fixing Holes p.c.d.: 14½ "
Weight: 30 lbs (including Crossover)
Finish: Cadmium plate and stove enamel