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Hardware Suggested For Use With TrueRTA:

► USB Interfaces and Measurement Microphones

  
 USB Audio Interfaces Suggested For Use With TrueRTA


When looking for an audio interface to use with TrueRTA you have many choices due to the wide use of these interfaces for computer music and home recording. The maximum sampling frequency is important  because the maximum measurement bandwidth can never be more than half the sampling frequency. Thus a maximum sampling frequency of 48 kHz results in a maximum measurement bandwidth of no more than 24 kHz. TrueRTA provides measurement bandwidths up to 46 kHz with interfaces that can operate at 96 kHz sampling rates. Make sure the interface you select has the input and output connections that you need for your particular measurement requirements. When you order an interface review the setup with care to make sure you have the necessary cables and any required adapters.


Behringer UM2 (at Amazon)

Approximately $77.95

The Behringer UM2 provides one phantom powered mic input along with stereo Line In and Line Out connections. The maximum sampling frequency is 48 kHz. The unit is powered from the USB port. This unit offers a lot of capability at a modest price.

 

I have one of these excellent little interfaces that I use for general testing. jlm

Focusrite Scarlett Solo USB Interface
Focusrite Scarlett Solo (at Amazon)

Approximately $99.99

The Focusrite Scarlett Solo is an excellent unit or use with TrueRTA. Provides one phantom powered mic input with up to 96 kHz sampling frequency for measurement bandwidth up to 46 kHz. The unit is powered from the USB port so no other power supply is required.

Focusrite Scarlett 2i2 USB Interface
Focusrite Scarlett 2i2 (at Amazon)

Approximately $149.99

The Focusrite Scarlett 2i2 is an upgrade from the Solo. It provides two phantom powered mic inputs with up to 96 kHz sampling for measurement bandwidths up to 46 kHz. The unit is powered from the USB port so no other power supply is required.

Tascam 2x2 USB Interface
Tascam US 2x2 (at Amazon)

Approximately $129.99

The Tascam interface has balanced line in and out on RTS 1/4" phone jacks. It provides two phantom powered mic inputs with up to 96 kHz sampling for measurement bandwidths up to 46 kHz. The 2x2 also provides a MIDI interface for music applications.

 

I do not have this particular interface but I do have two other Tascam interfaces (US-122MkII and US-16x08) that serve we well for measurement and home studio recording . I would expect excellent performance from the 2x2. jlm


MXL Mic Mate (at Amazon)

Approximately $41.99

Very simple. The Mic Mate provides phantom power and one microphone input. It has no line inputs or outputs.


Behringer UCA202 USB Interface (at Amazon)


Approximately $29.93

The Behringer UCA202 audio interface is as basic as it gets with Stereo Line In and Line Out on RCA connectors. By default TrueRTA is approximately calibrated for this unit. The UCA202 is powered from the USB port. The maximum sampling frequency is 48 kHz.

I have a couple of these interfaces and use them regularly for general line level testing. jlm

 
  Suggested Measurement Microphones


The key differences between measurement microphones and microphones used for music performing and recording are that measurement mics are virtually always omnidirectional and employ a very small mic element mounted in the smallest possible casing with a somewhat long neck and no ornamental obstructions. Their tips are often designed for increased sound energy diffusion as seen in the EMM-6 close-up below. As professional grade electret-condenser microphones they require phantom power delivered by way of the balanced XLR connection.

Dayton Audio EMM-6 Measurement Microphone
Dayton EMM-6 (at Parts Express)

Approximately $49.00

This is a nice measurement mic that comes with individually measured calibration data. It requires phantom power.

This is a very good general-purpose measurement microphone. If i doubt, start with this one. I have an EMM-6 that I use regularly. jlm

Behringer ECM-8000 Measurement Microphone
Behringer ECM8000

Approximately $59.99

This is a good measurement microphone that is widely available online and at many music stores. It requires phantom power.

dbx RTA-M Measurement Microphone
dBX RTA-M

Approximately $99.00

The dbx measurement mic is often used with the dbx DriveRack systems. It is similar to the ECM8000 or the EMM-6 and requires phantom power.

 

  Cables and Accessories


Pro Co15' (at Parts Express)

Approximately $9.98 
 

This is a basic 15' professional microphone cable suitable for acoustic measurement applications. Longer lengths are also available at the linked page.




  Table of Suggested USB Audio Interfaces
Manuf. Model Mic In : Conn. 48V Line In : Conn. Line Out : Conn. Max F(s) Bits MIDI Out Lvl Ctrls THD Pwr Price Comments
% $
Behringer UM2 1 : Combo Y 2 : 1/4 bal 2 : RCA 48k 16 N 1 USB 49.95 great value
Behringer  UCA-202 none N 2 : RCA 2 : RCA 48k 16 N none USB 34.00 line level only
Focusrite Scarlett Solo 1 : XLR Y 1 : 1/4 bal 2 : RCA 96k 24 N 1 0.003 USB $99.99 very nice, 1 line in
Focusrite Scarlett 2i2 2 : Combo Y 2 : 1/4 bal 2 : 1/4 bal 96k 24 N 2 0.003 USB $149.00 very nice
M-Audio M Track MkII 2 : Combo Y 2 : 1/4 bal 2 : 1/4 bal 48k 24 N 2 0.008 USB $99.00 nice
M-Audio M Trk Plus MkII 2 : Combo Y 2 : 1/4 bal 2 : 1/4 bal 96k 24 N 2 0.008 USB $149.99 nice
Presonus Audiobox USB 2x2 2 : Combo Y 2 : 1/4 bal 2 : 1/4 bal 48k 24 Y 2 USB $99.95 nice
Steinberg UR12 1 : XLR Y 2 : RCA 2 : RCA 192k 24 N 1 USB $80.71 good value
Tascam US 2x2 2 : Combo Y 1/4 bal 2 : 1/4 bal 96k 24 Y 2 <.003 USB $149.99 nice, 2 phone jacks

TrueRTA Selection Guide





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