SPL AUDIO P8 Eight-channel microphone preamplifer with discrete technology
Home / SPL AUDIO P8 Eight-channel microphone preamplifer with discrete technology
Product Overview
The IC-Free Pure Analog Workhorse for Multi-Channel Tracking
The SPL P8 brings absolute high-end discrete preamp design into a compact, streamlined 1U rack layout. While mass-produced multi-channel preamps lean heavily on cheaper, uninspired operational amplifier ICs that mask fine details and compromise soundstages, the P8 treats all eight channels identically with a proprietary transistor layout. Running on an optimized $\pm$17V analog rail topology, it delivers an ultra-wide frequency bandwidth (15 Hz to 200 kHz) and massive headroom. Designed to operate as an invisible "wire with gain," it amplifies the true acoustic footprint of your microphones without enforcing unwanted coloration or phase anomalies.
Product Description
100% Discrete Transistor Preamplification:
Each of the eight identically designed preamplifiers on the P8 is built entirely from individual, discrete transistors rather than integrated circuits. The critical differential input stage relies on a high-grade dual bipolar NPN transistor package. The thermal coupling of this discrete array optimizes common-mode rejection ($< 78\text{ dB}$), keeping the signal completely immune to external electronic interference. Whether paired with modern active condensers or low-output vintage passive ribbon mics, the P8 remains dead-quiet while capturing transient speed with pristine micro-detail.
Intelligent Parallel Analog Routing (Dual DB25 Outputs):
The rear panel of the P8 provides heavy-duty connectivity configured to standard TASCAM/AES59 specifications. In its purely analog configuration, the P8 features two parallel DB25 line output sockets. Both sockets simultaneously mirror the analog line-level signals of preamps 1 through 8. This integrated hardware splitter layout allows you to route one DB25 cable directly to your main multi-channel audio interface converters, while the secondary DB25 socket feeds a backup recorder or analog tracking console in parallel—completely eliminating the need for expensive external hardware signal splitters.
Surgical Control Per Channel:
The sleek front panel provides an uncompromised control layout for every channel, populated by premium components and jewel-toned, backlit hardware switches that ensure click-free and pop-free activation:
Analog Gain Control: A smooth-milled rotary pot providing a broad gain curve from +8 dB up to +62 dB.
-20 dB PAD Switch: Instantly drops the input level, extending the maximum input level handling up to +33.5 dBu—ideal for close-miked snare drums, extreme percussion, or explosive brass sections.
80 Hz High-Pass Filter: A precise 6 dB/octave analog low-cut filter to eliminate proximity boom, floor vibrations, and sub-bass ambient rumble.
Phase Inversion ($\emptyset$): Instantly flips signal polarity by 180° to guarantee cohesive phase correlation when balancing multi-mic setups.
+48V Phantom Power: Supplies clean, independent, ripple-free current to demanding studio condenser microphones.
Optional High-End ADAT Digital Conversion Expandability:
For studios looking to directly expand their current digital setup, the P8 can be configured with an optional 8-channel A/D converter card featuring an elite AKM AK5538 converter chip. This digital card replaces the secondary analog DB25 output, providing dual optical ADAT outputs with full S/MUX support. It handles sample rates up to 96 kHz in full 8-channel mode, and up to 192 kHz in 4-channel configuration, locking seamlessly via BNC Word Clock I/O with an integrated 75 $\Omega$ termination switch.
Key Features
PURE DISCRETE ARCHITECTURE: All 8 channels are built entirely with individual transistors without any sound-degrading IC op-amps.
UNCOLORED SONIC CHARACTER: Voiced for absolute analog transparency, delivering fast slew rates and an open, neutral soundstage.
DUAL MIRRORED DB25 OUTPUTS: Built-in analog splitting allows simultaneous feeds to main interface converters and backup recording rigs.
POP-FREE TRANSISTOR SWITCHING: Front-panel switches activate phantom power, PAD, phase, and HPF silently without audio pops.
3-STAGE LED LED METERING: Each channel features dedicated Green (-25 dBu), Yellow (0 dBu), and Red (+19 dBu clip) indicators for instant tracking visualization.
THROUGH-HOLE COMPONENT BUILD: Vital circuit paths utilize through-hole technology for optimized trace performance and longevity.
PREMIUM GERMAN CONSTRUCTION: Hand-built in Germany with a 4mm thick black-anodized aluminum faceplate, solid aluminum knobs, and a powder-coated steel chassis.
Technical Specifications
Feature
Specification
Device Type
Eight-Channel Pure Discrete Studio Microphone Preamplifier
Circuit Design
IC-Free, Individual Transistor Signal Flow Architecture
Gain Range
+8 dB to +62 dB (Continuously variable analog control)
Maximum Input Level
13.5 dBu (A massive 33.5 dBu with -20 dB PAD engaged)
