Well, I'm finally ready with all the equipment I need to do a proper round of room measurements -- almost! I bought a FBQ2496 and ECM8000, and this nifty external sound card from Native Instruments called the Audio Kontrol 1 (AK1). It has built-in phantom power, can do 24/192, and supports full duplex operations (verified). (It even comes with some nifty DJ software!) One problem though... it doesn't seem to work with REW.
When I fire up REW on my Mac (MacBook Pro, Intel Core Duo, Mac OS X 10.4.10) I get the following exception:
Unable to access the selected device
Message:
javax.sound.sampled.LineUnavailableException: Unexpected Error
Level:
SEVERE
Stack Trace:
com.sun.media.sound.SimpleInputDevice.nOpen(Native Method)
com.sun.media.sound.SimpleInputDevice.implOpen(SimpleInputDevice.java:275)
com.sun.media.sound.AbstractMixer.open(AbstractMixer.java:286)
com.sun.media.sound.AbstractMixer.open(AbstractMixer.java:334)
com.sun.media.sound.AbstractDataLine.open(AbstractDataLine.java:103)
com.sun.media.sound.SimpleInputDevice$InputDeviceDataLine.open(SimpleInputD evice.java:632)
roomeqwizard.O.I(Unknown Source)
roomeqwizard.M.actionPerformed(Unknown Source)
javax.swing.JComboBox.fireActionEvent(JComboBox.java:1197)
javax.swing.JComboBox.setSelectedItem(JComboBox.java:561)
javax.swing.JComboBox.setSelectedIndex(JComboBox.java:597)
roomeqwizard.O.A(Unknown Source)
roomeqwizard.O.C(Unknown Source)
roomeqwizard.O.A(Unknown Source)
roomeqwizard.M.actionPerformed(Unknown Source)
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882)
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202 )
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java: 420)
javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:2 69)
javax.swing.AbstractButton.doClick(AbstractButton.java:334)
javax.swing.AbstractButton.doClick(AbstractButton.java:282)
roomeqwizard.M.A(Unknown Source)
roomeqwizard.RA.<init>(Unknown Source)
roomeqwizard.RoomEQ_Wizard.main(Unknown Source)
I can however fire up REW with the native sound card, and after it's running, using the Audio MIDI Setup control panel, change to the AK1 (44.1kHz) -- the output will work, but not the input.
So I grabbed my wife's laptop that runs Windows XP Pro SP2. I installed all the latest AK1 software and drivers and this time set the sample rate to 48kHz. When I attempt to perform the soundcard calibration measurement, this time I get the 1kHz output tone, but with the output feeding back into the input (Line In 1), I get no input. I've tried every combination of inputs and settings -- Line In 2, setting the input device from Default to the AK1 explicitly... nothing seems to work.
I know this thing can support full duplex operation (I verified it with the DJ software) -- is it possible that it somehow recognizes that its output and line input are connected together and shuts down to avoid a feedback loop? Or is it just something about the REW software that doesn't like this box? Any suggestions?
Thanks,
Warren