Dual USB Mics - Imbalance of sound in Podcast

Hi
My wife and I are creating a PodCast in Garageband (first time using GB!). For the Podcast, we purchased 2 Blue Snowball USB microphones, including Pop filters.
I have followed the directions outlined here. No problem following the various steps, however, I have not used "Soundflower" yet.
When all is installed, Mic # 1 (male voice) sound comes through very clearly (quite loud). By contrast, Mic # 2 seems "distant" - voice recorded has a lot of echo and does not have the "presence" of Mic 1. To be sure the microphone was not defective, I switched the USB wires (they are both plugged directly into my iMac). The effect experienced with Mic 2 now shows up in Mic 1 and vice versa.
I have also noticed an error message appearing when I restart the computer (perhaps has no effect). The error says AudioPcDriver.kext incorrectly installed. Given it's an audio extension, I thought perhaps it might be contributing to the microphone imbalance.
Appreciate any feedback or guidance here.
thanks

Hi HT
Thanks for responding.
I tapped each mic. Only one showed sound recording. I switched the USB cables. No problem with the mics as the lack of sound on one mic switched to the other mic on the GB panel.
Here's a few screen shots:
Audio Midi Panel:
Male Track
Female Track
Thanks for the help.
Message was edited by: Hawaiian_Starman

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Mac
OS X Yosemite: Version 10.10.2
iMac (27-inch, Late 2013)
Processor : 3.2 GHz Intel Core i5
Hard-drive : 1 TB SATA Disk
Ram: 8 GB 1600 MHz DDR3
Graphics: NVIDIA GeForce GT 755M 1024 MB
Built-in Output:
Default System Output Device:       Yes
Manufacturer:                                  Apple Inc.
Output Channels:                             2
Current SampleRate:                      48000
Transport:                                        Built-in
Yeti Stereo Microphone:
Default Input Device:                      Yes
Default Output Device:                    Yes
Input Channels:                               2
Manufacturer:                                 Blue Microphones
Output Channels:                            2
Current SampleRate:                      48000
Transport:

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Dual USB Mics - Imbalance of sound in Podcast

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