| Content | User's manual
- Ultra compact phono preamplifier and equalizer
- Proper RIAA equalization
- RCA inputs and outputs
- 6.3 mm stereo headphone output connector
- Sturdy metal housing
- 12 V AC/DC adapter included
The LD Systems PPA 2 is a very compact analogue phono preamplifier, which equalises the extremely low output signal of conventional turntables to RIAA standards. It allows you to connect to devices without any phono input, such as mixers, PA power amplifiers or sound cards. The phono inputs are designed as RCA jacks, just like the line outputs; the PPA 2 also has a screw terminal for the ground conductor of the turntable and a 6.3 mm stereo jack for connecting a headset. The THD factor of the preamplifier is below 0.05% and the channel separation is -75 dB. The LD Systems PPA 2 uses a 12 V AC adapter; a bright LED indicates the power supply on the top of the sturdy metal chassis.
Product type
Other Studio and Recording Equipment
Type
Stereo Input / Stereo Output
Frequency response
RIAA Curve Hz
Signal-to-noise ratio
70 dB
THD |
- 1 microphone, XLR (bal.) or 6.3 mm jack (unbal.)
- Gain control, 10 steps (6-50 dB)
- Phantom power can be switched on
- Clip LED
- 1 line output, XLR (bal.) or 6.3 mm (unbal.)
- Operation via supplied power unit
| Power supply: | 12 V DC, 150 mA | | Input impedance: | 10 kohms bal./unbal. | | Max. input level: | +4 dB bal./+10 dB unbal. | | Gain: | 50 dB XLR/44 dB jack | | T.H.D.: | 0.01 % | | Frequency range: | 25 Hz - 16 kHz | | S/N ratio: | >75 dB | | Dimensions: | 143 x 93 x 45 mm | | Weight: | 350 g |
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PreSonusʼ popular Class A XMAX preamps are widely lauded for their clarity and transparency. Our tube preamps are beloved for their warm, smooth sound. With the Blue Tube DP V2 dual-path mic/instrument preamp, you get both types of high-quality sound in one unit.
Now weʼve improved on the classic unit with the BlueTube DP V2. The solid-state path now feeds PreSonusʼ top-of-the-line Class A XMAX™ mic preamplifier with 80 dB of variable gain—an upgrade from the original BlueTube DPʼs solid-state stage.
You still get all the secondary features you expect in a professional-grade preamp: 48V phantom power, an 80 Hz high-pass filter, -20 dB pad to control hot input signals, and a polarity-reverse switch. Each channel has an illuminated VU meter so you can visually monitor your input levels.
A Tube Drive control provides a wide range of sounds: when itʼs clicked off, youʼre using the solid-state preamp for quiet, transparent amplification; when itʼs engaged, your signals flow through the tube preamp, and you can achieve anything from gentle warmth to edgy distortion.
2 input channels, each with:
High-headroom Class A XMAX™ mic preamplifier with 80 dB gain range
12AX7 vacuum tube gain stage
Tube Drive tube-saturation control
48V phantom power
80 Hz high-pass filter
-20 dB pad to reduce hot input levels
Polarity-reverse switch
Illuminated analog VU input-level meter
Input/Output
2 balanced combo mic/unbalanced instrument inputs
2 balanced XLR main (L/R) line outputs
2 unbalanced ¼” main (L/R) line outputs
Physical
Compact 1/2U chassis
External 12 VDC, 1A power supply
| Highly versatile and portable, Sound Devices' MM-1 is a single-channel, portable microphone preamplifier with a powerful headphone monitoring function. Proven in mission-critical applications, the high-performance microphone preamplifier uses a transformer-balanced input and output with a bipolar ±15 volt power supply to produce low-noise, low-distortion gain at all switch positions. It features an "unclippable" dual-stage limiter and two-position high-pass filter. Flexible microphone powering provides phantom power at 48 volts or 12 volts and 12-volt T-power. It is powered from two-AA batteries or external 5-18 VDC.
The MM-1 is at home in high-definition television production, corporate/industrial environments, radio/television announce booths, and music production. Its headphone monitor is an advantage in applications where communications channels or mix-minus feeds need to be monitored in headphones. The user can monitor both microphone audio and external audio sources in headphones with level control.
The MM-1 is designed to be durable. Its aluminum chassis, oversized end panels, machined knobs, and panel mounted connectors assure reliable mechanical operation.
- Maximum of 66 dB of gain, in eleven discrete steps
- Dynamic range exceeding 120 dB
- 10 Hz to 50 kHz audio bandwidth
- High immunity to RF interference
- High current line output driver
- Transformer-balanced input and output
- Extended range peak limiter via dual opto-isolators makes preamplifier virtually "unclippable“
- Selectable 48-volt / 12-volt phantom power or 12-volt "T" power
- High-pass filter @ 80 or 160 Hz, 6 dB per octave
- Headphone monitoring of microphone audio, monitor audio, or a mix of both
- Monitor input accepts mono, balanced or unbalanced line-level inputs on 1/4-inch tip-ring-sleeve connector
- Separate level control of Monitor gain and overall headphone gain
- Split ear function via DIP switches
- Internal battery power (two-AA)
- Excellent battery life with alkaline and NiMH rechargeable batteries
- External 5-17 VDC powering (plug included)
- High-strength aluminum chassis with durable belt clip
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The PreSonus HP60 is the most flexible and advanced headphone amplifier system available for professional and project recording studios as well as live sound in-ear monitoring systems. Loaded with six independent,
loud and clear headphone amplifiers, the HP60 features dual stereo inputs as well as external input, for each
channel allowing you to mix between three stereo audio streams (mix A, mix B, and external input). Stereo output is also available on each channel to send line level headphone channel mixes to additional headphone amplifiers or monitor systems. Each channel features headphone level, mix control between A and B inputs, external input volume, mute and mono. The HP60 also features talkback via external XLR microphone input. Common set up of the HP60 in a recording session is to send the main control room mix to input A. Send the click track to input B. Send the each band member direct recording input to each channelʼs external input (more me). This will allow each band member to create a mix between the main mix, the click track and themselves. The HP60 is the ultimate headphone amplification system delivering loud and clear headphone mixes for real-world recording situations.
Features:
-Six independent ultra low noise, high output headphone amplifiers (150 mW per channel)
-Two sets of stereo inputs (A and B) with balanced TRS connectors
-Stereo external input point on each channel for "more me” with trim control
-Mix control between inputs A and B
-Talkback with external XLR microphone with control
-Direct stereo line output on each channel
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Input A
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(2) ¼” TRS balanced 10 Ohms
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Input B
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(2) ¼” TRS balanced 10 Ohms
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External input
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TRS stereo unbalanced 10 Ohms
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Headphone amplifier output power
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150 mW RMS (60 Ohms) per channel
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Audio outputs
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¼” TRS stereo unbalanced per channel
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Master controls
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Talk button, Talkback volume, Input A, Input B
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Channel controls
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Headphone level, Mix A/B control, External input level, Mono, Mute
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External talkback
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XLR with TS external control jack
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Power
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IEC 110V-240V internal switching
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| ISA OneClassic Single-channel Microphone Pre-amplifier with Independent D.I.
Key Features
ISA Series Transformer-based Pre-amplifier
Encased in a rugged and portable chassis, ISA One offers the classic Focusrite microphone pre-amplifier at its lowest cost to date.
Flexible Independent D.I. Channel
ISA One is ideal for both engineers and demanding performers alike, featuring independent gain control, an output for routing to an amp, an independent XLR output on the rear and routing to the optional ADC.
Switchable Impedance
Choose one of four carefully selected input impedances, including the original ISA 110 setting, to suit any microphone.
Optional Stereo 192kHz ADC
This optional card embodies cutting-edge conversion technology, incorporating Focusrite analogue circuitry to deliver the best A-D performance in its class (Dynamic range of 119dB).
Rugged Custom Flight Case
Built to protect your ISA One from the rigors of the road. Rugged plywood construction with a solid polypropylene exterior and reinforced corners.
Headphone Output with Volume Control
ISA One can feed either a sum of the two inputs to the headphones output, or an external stereo cue mix (such as a stereo mix feed from an interface) via two TRS Jack inputs on the rear of the unit.
Dedicated Insert Point
Allows you to place extra processing between the pre-amplifi er or D.I. and the optional converter, such as an EQ or compressor.
Specifications
Analogue Channel Inputs
- XLR Mic input
- One XLR and one TRS line input
- XLR Instrument input TRS Jack
- External ADC input TRS Jack
- TRS jack return
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Analogue Channel Outputs
- TRS jack send
- XLR balanced line output
- XLR DI output
- TS jack DI through
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Analogue Channel Additional I/O
- TRS Jack cue mix left input
- TRS Jack cue mix right input
- 1/4” TRS Jack headphones output
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Mic Input Response
| Gain range |
0dB to 60dB in 10dB steps + 20 dB of variable gain |
| Input Impedance |
Switched Impedance setting Equivalent Input Impedance at 1kHz |
Low = 600 Ohms
ISA110 = 1400 Ohms
Med = 2400 Ohms
High = 6800 Ohms |
| EIN (Equivalent Input Noise) |
-126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter |
| Noise |
Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter |
-97 dBu |
| Signal-to-Noise Ratio |
106 dB relative to max headroom (9dBu) |
| Total Harmonic Distortion + Noise |
Measured at medium gain (30dB) with a 1kHz -20dBu input signal and with a 22Hz/22kHz band-pass filter |
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| Frequency Response |
At minimum gain (0 dB) |
-0.5dB down at 10Hz and -3dB down at 125kHz |
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At maximum gain (60dB) |
-3dB down at 16Hz and -3dB down 118kHz |
| CMRR (Common Mode Rejection Ratio) |
98dB (Channel 1, 1kHz, maximum gain with +24 dBu input) |
| Crosstalk Channel to Channel |
With 10dB@1kHz input to chA, chB output =104dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA |
Line Input Response
| Gain range |
-20dB to +10dB in 10dB steps + 20 dB of variable gain |
| Input Impedance |
10 kΩ from 10 Hz to 200 kHz |
| Noise |
Noise at main output with gain at unity (0 dB) measured with 50 Ω source impedance and a 22Hz - 22 kHz band pass filter |
-96 dBu |
| Signal-to-Noise Ratio |
Measured with a 22 Hz-22 kHz band pass filter |
120 dB relative to max headroom (24 dBu)
118dB relative to 0dBFS (+22dBu) |
| Total Harmonic Distortion + Noise |
Measured with a 0 dBu input signal, and a 22 Hz-22 kHz band pass filter |
0.0001% |
| Frequency Response |
At unity gain (0 dB) |
-0.3dB down at 10Hz and -3dB down at 200kHz |
Instrument Input Response
| Gain range |
10dB to 40dB continuously variable |
| Input Impedance |
High = greater than 1M
Low =greater than 300k |
| Noise |
Measured with 22 Hz-22 kHz band pass filter |
Minimum gain (+10 dB): -92 dBu
Maximum gain (+40dB): -62dBu |
| THD |
At minimum gain (+10) |
| Frequency Response |
At minimum gain (+10 dB) |
-10dB input: 10Hz-100kHz +/- 0.6dB |
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At maximum gain (+40 dB) |
-40dB input: -2.5dB down at 10Hz and 0dB at 100kHz |
Meters
| Moving Coil (MC) Meter |
factory calibrated to 0VU = +4dBu with 1kHz sinewave. With the VU Cal button pressed the meter can be adjusted on the rear panel to allow 0VU to equal +10dBu to +26dBu with the centre detent being equal to +22dBu. |
| Peak LED Meters |
Calibrated in the detent position for 0dBFS = +22dBu, calibration is adjustable on the rear panel to allow 0dBFS to equal +10dBu to +26dBu |
| Routing for MC and Peak1 meter is after the HPF, pre insert send or switched post insert return. Peak2 is always pre ADC channel 2, which can be fed by external input or Instrument input. |
| LED Levels |
As follows, when peak calibration is set to center detent on the rear panel. (This is when using the internal ADC). |
0 = +22dBu
-2 = +20dBu
-6 = +16dBu
-12 = +10dBu
-18 = +4dBu
-42 = -20dBu |
| Frequency Response |
At minimum gain (+10 dB) |
-10dB input: 10Hz-100kHz +/- 0.6dB |
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At maximum gain (+40 dB) |
-40dB input: -2.5dB down at 10Hz and 0dB at 100kHz |
High-Pass Filter
| Roll-Off |
18 dB per octave (3 pole filter) |
| Frequency |
Fixed 75Hz measured at the 3dB down point |
Weight and Dimensions
| W x D x H |
220mm (W) x 104mm (H) x 254 - 290mm (D - top to bottom) |
8.66" (W) x 4.1" (H) x 10" - 11.4" (D - top to bottom) |
| Weight |
3.9 kg |
8.6 lbs |
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