The XSP 10.0 preamplifier has been designed to give great satisfaction to the most demanding audiophile. The very high quality of the materials used and the technologies adopted in the design and construction allow it to be compared with the best international products.
These are the main features:
- MM phono section with passive RIAA equalization with 40 dB gain
- Pre-amplifier section with 20 dB of gain
- Inputs: Phono - DAC - Tuner - AUX
- Volume adjustment with resistive network and independent 6-bit relay for the two channels
- Balance adjustment integrated in the volume adjustment
- Mute function
- Completely independent left and right channels
- Power supply in separate frame
- Headphone amplifier for output impedances from 8 to 600Ω
- Polyphenylene sulfide (PPS) capacitors in audio circuitry (pre only)
- ELNA Silmic II (silk) capacitors in complete audio circuitry
- 0.1% high stability SMD thin film resistors in the audio circuitry (pre only), 0.1% metal oxide in the rest of the circuitry
- 4-layer printed circuit boards in the preamp chassis
- Completely protected from over temperatures
- Panels with CNC engraved lettering
- Designed, welded, assembled and tested completely by hand in Italy
- High-class electronic components found mainly in the USA
The listed features, and the many others present, give the preamplifier an extremely pure signal reproduction with an extremely low noise, these two factors allow the listener to distinguish the sonic details present in the songs, the "micro sounds" in fact, which otherwise they would get lost in the “confusion” generated by the noise and distortions that plague many preamps.
The noise floor with maximum volume and short-circuited inputs is in the range from -120 to -140 dBV, very low values.
The reduced tolerances of the components provide extreme equality in the levels of the channels and a correspondence of the linearity of the RIAA curve of ± 0.2 dB from 20 Hz to 20 kHz.
The phase of the signal from the phono input to the output does not show inversions from 20 Hz to 20 kHz.
The output of the preamp itself can generate a 36V peak-to-peak signal on relatively low loads of 600Ω.
The built-in headphone amplifier is generously sized and is capable of delivering 5W of power into 8Ω or 200mW into 600Ω. There is also a rear adjustment of the gain of the headphone amplifier to adapt the output signal to the extreme variability of the impedance of the headphones on the market (from 8Ω to 600Ω).
The presence of a digital microcontroller control allows the volume to be increased automatically at the output of the mute or in the passage from one input to another.
The cleanliness of the sound is also indicated by the very low output noise: without noise the sonic details are fully heard.
You put the sound, a lot of space remains.
The preamplifier consists of a two-stage Phono MM amplification section, RIAA equalized with a total gain of 40 dB at 1 kHz, and a final amplification section of 20 dB of gain. For the Phono input, the maximum amplification from the input to the output of the preamplifier with maximum volume will therefore be 60 dB (40 + 20). The other inputs, DAC, Tuner, AUX are not amplified except by the final stage of the preamplifier (+ 20dB). The various inputs are connected alternately to the input of the final volume adjustment and amplification section by means of a relay with Palladium contacts1 to guarantee the quality of contact over time. The headphone amplifier receives the signal from the final output of the preamp and adds an additional gain from +6 dB to + 16dB. The power supply provides the dual power supply voltage ± 18V and + 5V for the digital circuitry.RIAA equalized MM Phono input
- Amplification gain: 40 dB @ 1 kHz
- Input resistance: 47.5KΩ
- Input capacity: 22 pF
- RIAA weighted frequency response: ± 0.25dB 20Hz to 20kHz
- Total harmonic distortion THD RIAA weighted, in -40 dBV, out +20 dBV2 : 0.0028% (this value includes the distortion of the final stage of the preamplifier)
- Total harmonic distortion with THD + N noise, RIAA weighted, in -40 dBV out +20 dBV: 0.013% (this value includes the distortion and noise of the final stage of the preamplifier)
- Maximum input signal: -40 dBV @ 20 Hz, - 20 dBV @ 1 kHz, 0 dBV @ 20 kHz
- AC coupled inputs to safeguard the pickup head in case of electronics failure.
- Channel separation: 105 dB @ 1 kHz
- Input resistance 50kΩ
- Maximum input signal +18 dBV
- Input sensitivity to generate 1V RMS (0 dBV): -20 dBV
Output amplifier section
- Frequency Response: ± 0.1dB 20Hz to 20kHz
- Frequency Response: -3dB from 4Hz to 70kHz
- Total harmonic distortion THD: 0.00059% @ 1kHz @ +20 dBV out
- ITU-R IMD Intermodulation Distortion: 0.0015% @ 0 dBV out
- IMD SMTPE intermodulation distortion: 0.0039% @ 0 dBV out
- Background noise output: -120 dBV max. 10Hz to 300Hz, -135dBV 300Hz to 20kHz @ input DAC short, Max.
- AC coupled inputs to protect the preamplifier
- Channel separation: 110dB @ 1kHz
- Output Impedance: 100Ω
- Output signal at maximum load: +12 dBV @ 1 kHz into 100Ω (150 mW power)
- Gain adjustable from + 6dB to +16 dB
- Working class AB, less than 1W output: class A
- Total harmonic distortion THD: 0.003 @ 1kHz 5W RMS out 8Ω
- Total harmonic distortion THD: 0.0035 @ 5 kHz 5W RMS out 8Ω
- Frequency response -3 dB: 11Hz to 67kHz @ 5W RMS out 8Ω
- Headphone output in complementary symmetry coupled in direct current
- Power absorbed from the mains: 10W @ 230V typical, 30W maximum
- Input voltage: 230V AC 50Hz 10% (115V AC 60Hz internally settable by welding)
Measurements and weights
- Preamplifier unit dimensions W x D x H mm: 234 x 200 x 95
- Power supply unit dimensions W x D x H mm: 234 x 200 x 95
- Working temperature ° C: -10 + 40
- Preamp Unit Weight: 1.9kg
- Power unit weight: 2.8 kg
1 - It is a rare metal, with a silvery-white appearance, of the platinum group to which it also chemically resembles: it is mainly extracted from some copper and nickel minerals. Its most common uses are in industry, as a catalyst, and in jewelry. (from Wikipedia)
2 - dBV, are decibels referred to 1 Volt RMS, thus dBV =. 20 dBV equals 10 V RMS. A negative value indicates voltages less than 1V RMS. The calculation in decibels is useful for expressing perhaps very small values which, expressed in a linear way, would give little meaningful values. For example -120 dBV converted into Volts are 0.000001 Volts, therefore 1 µV.