DESCRIPTION
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2 Channels of our Precision Phantom Networks
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2 Channels of our DC-Coupled Microphone Preamps
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Back-Up Recorder
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Zero-Latency Monitoring
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FX Sends
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Purist Phantom Patching
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Input Balance Precision: ≤ 0.01%
Phantom Voltage: +50Vdc Phantom Current Reserve: 700mA/ch. Channel Crosstalk: <-160dB [10kHz] CMRR: -110dB [60 Hz, +60dB gain] CMRR: -100dB [10kHz, +60dB gain] |
Input Impedance: 3000Ω
Distortion: 0.00094% [+30dB gain,1kHz, +24dBu out] SMPTE IMD: 0.0032% [250Hz+8kHz, 4:1] Max. Input: +22dBu [+7.5dB gain] Max. Output: +29.5dBu [10kΩ load, ≤ 0.0024% thd] Max. Output: +27.5dBu [600Ω load, ≤ 0.0024% thd] |
Bandwidth: DC to 500kHz [+0/-3dB]
Spectral Accuracy: ±0.04dB [20Hz-20kHz] Linear Phase Deviation: 0˚ [20Hz] EIN: -138dBv [Rs=0Ω, 20-22kHz, A-weighted] EIN: -131dBu [Rs=50Ω, 20-22kHz, unweighted] |
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Dimensions: 1U x 19" x 6"
Requires a PS34 power station for operation (sold separately). 6' DC interconnect cable included.
XLR Jumpers required to connect Phantom channels to MicPre channels, not included.
Requires a PS34 power station for operation (sold separately). 6' DC interconnect cable included.
XLR Jumpers required to connect Phantom channels to MicPre channels, not included.
FAQ's (frequently asked questions):
Q: What does "DC-Coupled" mean?
A: DC is an abbreviation for Direct Current. DC is an electric current which flows in a single direction, as from a battery. In contrast, audio signals are AC or Alternating Current. Typically, capacitors and transformers are used to form AC-Coupled circuits which allow AC signals to pass while blocking DC. Most commercial preamps are AC-Coupled. But caps and transformers are reactive components which produce frequency dependent phase shifts. This can negatively influence perceived resolution and transparency. In a DC-Coupled circuit these components are not present. Since Pueblo Audio preamps are designed with DC-Coupled circuits, their phase and frequency response remain linear and free of reactive distortions. In fact, they have no low frequency cut-off at all; being flat down to zero hertz! This is one reason for their relaxed, effortless sound.
Q: Will exposing the DC-Coupled inputs to phantom power harm the Preamp?
A: No. The preamp inputs are protected from exposure to phantom power, hot patching, static discharge and other such casualties. During product development, a special test jig was fabricated to zap a preamp's input with 60 volts sourced from 2,000uF storage capacitors. The jig cyclically zapped the same preamp once every 90 seconds for 60 days: 57,600 zaps in total (each zap from the jig pulsed enough energy to spot-weld relay contacts!) Afterwards, the preamp was tested and found to still be working perfectly. It still performs beautifully today, many years later. Pueblo Audio's design dispels any concerns, leaving the user worry-free.
Q: Are the Phantom channels and Preamp channels internally connected?
A: No. Each channel is a stand-alone module with no internal signal connections. A number of considerations led to this configuration. First - most commercial preamps which have ribbon mic inputs do not offer fully bypassed phantom circuits. Their phantom circuit's "back end" is always tied to their preamp's front end. This can negatively disturb the mic signal, which partially defeats the purpose of having a special ribbon input. Since JR2/2 phantom channels can be patched completely out of circuit, this issue is totally avoided. Second - all audio electronics, including mics, take an hour or more to warm up and reach optimal operating condition. With Pueblo Audio, an "idle" Phantom channel can remain connected to its mic, keeping it warmed up and ready to go at all times. Third - many Pueblo owner's have remarked on the extra size, image stability and natural timbre that Pueblo Phantom channels gives to their microphones, so they requested the phantom channels be available to use with all their mic preamps.
Q: So then why use an XLR cable to patch the Phantom channel to the Preamp? Why not just use a switch or relay?
A: After extensive auditions it was found that very few switches or relays sounded more transparent than an XLR. Those that did were so expensive it would have pushed final product pricing out of reach. Further, the XLR configuration offered the absolute minimal number of connections in the signal path. Though an unusual solution, the XLR configuration ultimately distinguished itself for cost, fidelity and flexibility.
Q: But I use Phantom powered mics almost exclusively and don't want to deal with jumper cables.
A: If desired, any JR2/2 may be ordered with adjacent phantom and preamp channels internally hardwired. This would eliminate the need for external jumper cables. The DC-coupled inputs would still be available, but the phantom circuitry would remain connected. This is a compromise when using non-phantom mics.
Q: Why no Polarity Invert (aka "Phase Reverse") function?
Polarity Invert buttons are installed nearly everywhere these days. You find them in most DI's, Consoles, Computer Interfaces and DAW Software. Maybe it's good marketing but with so many opportunities to "flip the phase" along the signal path, why add yet another? It seems a bit superfluous and increases the chance of accidentally double-flipping, sabotaging the desired polarity. We felt it better to just omit this option and gain a little more signal path integrity. Besides, it helps with the price, too.
Q: What does "DC-Coupled" mean?
A: DC is an abbreviation for Direct Current. DC is an electric current which flows in a single direction, as from a battery. In contrast, audio signals are AC or Alternating Current. Typically, capacitors and transformers are used to form AC-Coupled circuits which allow AC signals to pass while blocking DC. Most commercial preamps are AC-Coupled. But caps and transformers are reactive components which produce frequency dependent phase shifts. This can negatively influence perceived resolution and transparency. In a DC-Coupled circuit these components are not present. Since Pueblo Audio preamps are designed with DC-Coupled circuits, their phase and frequency response remain linear and free of reactive distortions. In fact, they have no low frequency cut-off at all; being flat down to zero hertz! This is one reason for their relaxed, effortless sound.
Q: Will exposing the DC-Coupled inputs to phantom power harm the Preamp?
A: No. The preamp inputs are protected from exposure to phantom power, hot patching, static discharge and other such casualties. During product development, a special test jig was fabricated to zap a preamp's input with 60 volts sourced from 2,000uF storage capacitors. The jig cyclically zapped the same preamp once every 90 seconds for 60 days: 57,600 zaps in total (each zap from the jig pulsed enough energy to spot-weld relay contacts!) Afterwards, the preamp was tested and found to still be working perfectly. It still performs beautifully today, many years later. Pueblo Audio's design dispels any concerns, leaving the user worry-free.
Q: Are the Phantom channels and Preamp channels internally connected?
A: No. Each channel is a stand-alone module with no internal signal connections. A number of considerations led to this configuration. First - most commercial preamps which have ribbon mic inputs do not offer fully bypassed phantom circuits. Their phantom circuit's "back end" is always tied to their preamp's front end. This can negatively disturb the mic signal, which partially defeats the purpose of having a special ribbon input. Since JR2/2 phantom channels can be patched completely out of circuit, this issue is totally avoided. Second - all audio electronics, including mics, take an hour or more to warm up and reach optimal operating condition. With Pueblo Audio, an "idle" Phantom channel can remain connected to its mic, keeping it warmed up and ready to go at all times. Third - many Pueblo owner's have remarked on the extra size, image stability and natural timbre that Pueblo Phantom channels gives to their microphones, so they requested the phantom channels be available to use with all their mic preamps.
Q: So then why use an XLR cable to patch the Phantom channel to the Preamp? Why not just use a switch or relay?
A: After extensive auditions it was found that very few switches or relays sounded more transparent than an XLR. Those that did were so expensive it would have pushed final product pricing out of reach. Further, the XLR configuration offered the absolute minimal number of connections in the signal path. Though an unusual solution, the XLR configuration ultimately distinguished itself for cost, fidelity and flexibility.
Q: But I use Phantom powered mics almost exclusively and don't want to deal with jumper cables.
A: If desired, any JR2/2 may be ordered with adjacent phantom and preamp channels internally hardwired. This would eliminate the need for external jumper cables. The DC-coupled inputs would still be available, but the phantom circuitry would remain connected. This is a compromise when using non-phantom mics.
Q: Why no Polarity Invert (aka "Phase Reverse") function?
Polarity Invert buttons are installed nearly everywhere these days. You find them in most DI's, Consoles, Computer Interfaces and DAW Software. Maybe it's good marketing but with so many opportunities to "flip the phase" along the signal path, why add yet another? It seems a bit superfluous and increases the chance of accidentally double-flipping, sabotaging the desired polarity. We felt it better to just omit this option and gain a little more signal path integrity. Besides, it helps with the price, too.