tinybox Configuration
The standard feature set for tinybox includes (new features for v2 highlighted):
- +12V, +16V, +48V, or switchable +16V/+48V phantom power
- direct capsule polarization voltage of +53V
- low-voltage microphone power, up to +16V
- dual green/red LED power, clip meter, and low battery indicator
- three-level customizable stereo gain switch
- minijack, 6-pin mini-XLR, or 4-pin/5-pin Binder® input
- available high-impedance instrument adaptor cable
- internal lithium-ion battery
- optional line/headphone minijack output (increased power in v2)
- optional three-position customizable power switch
- optional mid/side decode/encode minijack output
- optional low-noise amplifier
- optional output transformers
All tinybox features are located on the front panel, except for the rear panel battery charge jack.
Input options
- stereo 3.5mm TRS minijack
- 6-pin mini-XLR male jack
- 5-pin Binder® series 711 female jack
- 4-pin Binder® series 711 male jack
The mini-XLR input/output pin configuration is as follows:
6-pin:
pin 1: low-voltage mic power supply, high-voltage capsule polarization/phantom voltage, right submix input, right line output, or ground
pin 2: right noninverting input
pin 3: left noninverting input
pin 4: low-voltage mic power supply, high-voltage capsule polarization/phantom voltage, left submix input, left line output, or ground
pin 5: right inverting input
pin 6: left inverting input
chassis: ground
Each signal input pin may be configured as a power pin and/or signal pin, with or without DC termination. This allows the pairs of signal pins (noninverting and inverting) to be used to support different microphone types. For example, the inverting inputs can be configured for plug-in power microphones (which are typically reverse signal polarity), and the noninverting inputs together with the microphone power supply pins 1 and 4 may be used with "three-wire" lapel microphones.
The microphone power supply pins 1 and 4 may be used to enable many different custom configurations. For example, all signal pins may be left unpowered and supply resistors may be located in external cable connectors to enable support for each type of required microphone.
The high-voltage capsule polarization supply offers +53V (v2) with maximum current of 100uA to enable certain "active" microphone capsules to be directly connected to tinybox.
Output options
- 3.5mm TRS minijack with line/headphone, mid/side decode/encode, or submix output options
- optional output transformer (600Ω:600Ω)
- optional direct line output (transformerless) on 6-pin mini-XLR
tinybox is a two-stage amplifier device; the 6-pin mini-XLR input pins (2,3,5,6) are routed to the microphone amplifier, with gain of +0dB to +44dB (+56dB max with low-noise amplifier option). The output of the microphone amplifier is routed to the output amplifier, connected to the front panel minijack output. The output amplifier has three possible configurations: line/headphone, mid/side decode, or mixer.
The standard line/headphone output is capable of driving line loads to +13dBV, and low- to high-impedance headphones (16Ω to 300Ω) at up to 175mW per channel. The main minijack output may be internally attenuated (fixed attenuation) to calibrate desired direct output and headphone output levels. This option can be customized for a selected headphone impedance. Alternatively, the customer may wish to use an external inline headphone attenuator.
The headphone amplifier circuit uses a modified class G power supply, which increases efficiency for low-impedance loads while maintaining maximum possible headroom for high-impedance loads. This circuit can reduce output amplifier power consumption by up to a factor of two compared with a standard class AB amplifier.
The mid/side decode feature enables monitoring of a mid/side microphone pair as left/right (or a left/right pair as mid/side).
The mixer configuration enables use of pins 1 and 4 on the 6-pin mini-XLR input connector as a submix input mixed with the output of the microphone amplifier. Maximum headphone output power is reduced with mid/side decode or mixer configurations, but line level headroom is maintained at +13dBV.
The optional 600Ω:600Ω output transformer may be combined with line output, mid/side decode or mixer output options. Headphones cannot be used with the output transformer.
A direct line output (transformerless) from the microphone amplifier is available on the 6-pin mini-XLR connector, bypassing the output amplifier stage. The direct line output can also drive a line load to +13dBV (headphones not recommended with 6-pin line output feature). The direct line output and main line/headphone outputs are independent and may be used to drive separate loads simultaneously to monitor while recording.
Microphone power options and power switching
- +12V, +16V, or switchable +16V/+48V phantom power (v2)
- +8V plug-in power
- +8V power for "three-wire" lapel-style microphones (balanced or unbalanced configuration)
- +12V T-power
- +53V (v2) capsule polarization voltage
- optional three-position customizable power switch (v2)
- available high-impedance 1/4" jack input adaptor cable
The master power switch may be a two-way (on/off) or three-way switch (on/off/on; v2 only).
Three-way switching has several customizable options; it may generally operate either as a line/mic input switch (turns microphone power off in line mode, and headphone output amplifier to low-impedance in line mode) or a high/low microphone power switch (to select between microphone power options or phantom power voltage).
The options for each pin (if powered) and the output amplifier are:
pin 1: microphone power on/off, or microphone power high/low (typically +48V/+16V)
pin 2: microphone power on/off
pin 3: microphone power on/off
pin 4: microphone power on/off, or microphone power high/low (typically +48V/+16V)
pin 5: microphone power on/off
pin 6: microphone power on/off
output amplifier: high-impedance/low-impedance mode
The output amplifier mode switches to a lower voltage supply for higher efficiency (net maximum 40% vs. 25%) with low-impedance headphones (<100Ω)
The high-impedance input cable incorporates a discrete FET buffer inside a 1/4" jack to 6-pin mini-XLR cable, offering 1MΩ input impedance. The adaptor cable may be mono, stereo, or dual 1/4" jack, balanced or unbalanced input.
Gain control
- Stereo three-position configurable gain switch
- +0dB to +44dB gain range
- +0dB to +56dB gain range for low-noise amplifier
- Standard gain settings: +4dB, +18dB, +32dB
The optional low-noise microphone amplifier provides reduced equivalent input noise at the cost of higher current consumption. It is mainly recommended with low-sensitivity balanced-output microphones, including dynamic microphones. Standard gain settings for low-noise amplifier are +4dB, +25dB, +49dB.
Metering
- Green/red power, clip meter, and low battery indicator LED
Power LED will glow green when unit is switched on; low battery indicator will continuously light red LED when battery voltage drops to +7.0V (at 20% remaining battery life). Red LED will also briefly light at signal clipping—LED meter threshold may be customized upon request. Standard clip setting for v2 is +6dBV (7dB headroom above clip indication).
Power
- Internal rechargeable 4.8Wh lithium-ion battery
Internal rechargeable lithium-ion battery provides 650mAh at +7.4V, for life of 4.8Wh. Battery is recharged via 2.1mm center-positive power jack. When charger is connected, power supply to tinybox will be interrupted and tinybox will not operate properly. While tinybox will not be damaged if left on while charging, since normal function is not possible tinybox should be switched off. Charger rated for 100VAC to 240VAC input; US-style plug. International adaptor plugs are not supplied by Naiant.
tinybox v2.1 (May 2012 and later; with rear panel LED): may be recharged with any supply from 9-15VDC, center-positive, 0.3A minimum required for maximum charge rate.
earlier versions (v1, v1.5, v2): to avoid risk of battery damage and possible fire, charger provided by Naiant (8.4VDC with regulated charge current) must be used to recharge battery.
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| with XLR input and miniplug output adaptor cable |
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tinybox Specificationsv2, production dates Feb. 2012 to May 2012
v2.1, production dates May 2012 and later
Type: two-channel microphone amplifier with high-current output, optional output transformers, and optional low-noise amplifier
Phantom Voltage: +48V supplied across 7KΩ equivalent resistance, +16V supplied across 2.2KΩ resistors, or +12V supplied across 680Ω resistors
Phantom Current: 6mA max per microphone, +48V; 14mA per microphone, +16VPlug-in Power: +8V supplied across 5.6KΩ resistor, 1mA maximum"3-wire" Power: +8V supplied across 3.3KΩ resistor, 2mA maximumT-Power: +12V supplied across 180Ω resistor, 5mA maximumCurrent (from 7.4V Li-ion battery):
- no microphone power load: 20mA
- +48V phantom power, 5mA per mic load: 120mA
- low-noise amplifier, no microphone power load: 50mA
- low-noise amplifier, +48V phantom power, 5mA per mic load: 150mA
- maximum load: 300mA
Estimated battery life, low-voltage microphones: 12-30 hoursEstimated battery life, +48V phantom power: 4-10 hoursInput Impedance: set by microphone power supply resistors
Input Impedance, high input impedance adaptor cable: 1MΩ
Output Impedance, direct line output: 100ΩOutput Impedance, line/headphone output: 7Ω ( 12Ω for mid/side and mixer output) Minimum Load Impedance, direct line output: 600ΩMinimum Load Impedance, line/headphone output: 16ΩGain Range: +0dB to +44dB; standard settings +4dB, +18dB, +32dB Gain Range, low-noise amplifier: +0dB to +56dB; standard settings +4dB, +25dB, +49dB Maximum Input Level, 1kHz @ 1% THD: +13dBVMaximum Output Level, direct line output, 1kHz @ 1% THD: +13dBVMaximum Output Level, line/headphone output (high/low power), 1kHz @ 1% THD:
- 1KΩ load: +13dBV/+8dBV
- 600Ω load: +10dBV/+8dBV
- 300Ω load: 65mW/23mW
- 200Ω load: 90mW/35mW
- 100Ω load: 150mW/60mW
- 50Ω load: 175mW/110mW
- 16Ω load: 160mW/160mW
- net efficiency*, 16Ω load, 160mW: 25%/40%
*net efficiency figure includes power loss to DC converter and power regulation circuits.
Total Harmonic Distortion, direct output, 1kHz @ 0dBV: <0.005%Crosstalk, 1kHz @ 0dBV: -70dBFrequency Response: 20Hz to 30kHz Equivalent Input Noise, maximum gain: -115dBV unweighted; -119dBAEquivalent Input Noise, maximum gain, low-noise amplifier: -122dBV unweighted; -126dBACommon Mode Rejection Ratio: 50dB minimumCase size: 3.2" x 2.1" x 0.9" (80mm x 54mm x 23mm)Weight (with battery): 5 oz (143g)
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| quadbox - custom dual tinybox |
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tinybox Specificationsv1 and v1.5, production dates before February 2012
Type: two-channel microphone amplifier with high-current output (v1.5)
Phantom Power: +16V supplied across 1.65KΩ resistors or +12V supplied across 680Ω resistors, 14mA maximum current per microphone
Plug-in Power: +8V supplied across 5.6KΩ resistor, 1mA maximum
"3-wire" Power: +8V supplied across 3.3KΩ resistor, 2mA maximum
T-Power: +12V supplied across 180Ω resistor, 5mA maximum
Polarization voltage (v1.5): +45V supplied across 38KΩ resistance
Current (from 7.4V Li-ion battery), +16V, no microphone power load: 11mA
Current (from 7.4V Li-ion battery), +16V, 5mA per mic phantom power load: 50mA
Current (from 7.4V Li-ion battery), +16V, maximum load: 100mA
Estimated battery life in normal use: 12-20 hours
Input Impedance: set by microphone power supply resistors
Output Impedance, direct output: 150ΩOutput Impedance, high-current output (v1.5): 10ΩMinimum Load Impedance, direct output: 1KΩMinimum Load Impedance, high-current output (v1.5): 32Ω (>50 Ω recommended)Gain Range: +0dB to +44dB, standard settings of +4dB, +18dB, +32dB Maximum Input Level, 1kHz @ 1% THD, +12V: +10dBVMaximum Input Level, 1kHz @ 1% THD, +16V: +13dBVMaximum Output Level, direct output, 1kHz @ 1% THD, +12V: +10dBVMaximum Output Level, direct output, 1kHz @ 1% THD, +16V: +13dBVMaximum Output Level, high-current output, 1kHz @ 1% THD, +16V/+12V (v1.5):
- 10KΩ load: +11dBV/+8dBV
- 600Ω load: +10dBV/+8dBV
- 300Ω load: 35mW/20mW
- 200Ω load: 45mW/30mW
- 100Ω load: 40mW/35mW
- 50Ω load: 30mW/30mW
Total Harmonic Distortion, direct output, 1kHz @ 0dBV: <0.005%Crosstalk, 1kHz @ 0dBV: -80dBFrequency Response: 20Hz to 30kHz Equivalent Input Noise, maximum gain: -115dBV unweighted; -119dBACommon Mode Rejection Ratio: 50dB minimumCase size: 3.2" x 2.1" x 0.9" (80mm x 54mm x 23mm)Weight (with battery): 5 oz (143g)
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Notice of FCC compliance
Pursuant to section 15.103(h), tinybox, littlebox, and bigbox are exempt from Part 15 of the FCC rules. These units qualify for exemption as the highest frequency generated by the devices is less than 1.705mHz, and they do not operate from the AC power lines or contain provisions for operation while connected to the AC power lines. Use of littlebox's external battery jack with any device that connects to the AC power lines violates Part 15 of the FCC rules and is expressly forbidden. Connection of littlebox to the AC power lines will void its warranty.
The internal lithium-ion battery option is designed to be recharged with the supplied charger. When connected to the charger and AC power lines, the units' DC converter circuits are disabled and thus do not operate as an unintentional radiator while charging. Units should be switched off during charging.
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