# Can not use MIC\_2 as single-ended interface **URL:** \ **Category:** Legacy AirPrime modules\ **Created:** [January 15, 2008, 10:40am UTC](https://forum.sierrawireless.com/t/can-not-use-mic-2-as-single-ended-interface/1825 "2008-01-15T10:40:29Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![lyxdlmu](https://avatars.discourse-cdn.com/v4/letter/l/b9bd4f/32.png) [@lyxdlmu](https://forum.sierrawireless.com/u/lyxdlmu)\ **Post date:** [January 15, 2008, 10:40am UTC](https://forum.sierrawireless.com/t/can-not-use-mic-2-as-single-ended-interface/1825/1 "2008-01-15T10:40:29Z")
Can MIC\_2 be used as single-ended interface in the module Q2438? I have sent : AT+SPEAKER=1 But it did not work. When I used the same circuit on MIC\_1, and sent: AT+SPEAKER=0, it worked well. Why? ---
**Author:** ![terry.biberdorf](https://avatars.discourse-cdn.com/v4/letter/t/54ee81/32.png) [@terry.biberdorf](https://forum.sierrawireless.com/u/terry.biberdorf)\ **Post date:** [January 16, 2008, 4:37pm UTC](https://forum.sierrawireless.com/t/can-not-use-mic-2-as-single-ended-interface/1825/2 "2008-01-16T16:37:06Z")
Very confusing API from Wavecom. AT+SPEAKER=1 directs audio to AUDIO2 port AT+SPEAKER=2 directs audio to AUDIO1 port. My only guess is that something is lost in the translation from French 😉 ---
**Author:** ![bandali](https://avatars.discourse-cdn.com/v4/letter/b/e36b37/32.png) [@bandali](https://forum.sierrawireless.com/u/bandali)\ **Post date:** [October 5, 2009, 7:12pm UTC](https://forum.sierrawireless.com/t/can-not-use-mic-2-as-single-ended-interface/1825/3 "2009-10-05T19:12:36Z")
somehow, I have the very same problem! in the AT command user guide (version 7.1 or 7.4, no difference), it is said that “AT+SPEAKER=1” means MIC\_1, Spk\_2 but when I set configuration to “AT+Speaker=1”, just MIC\_2 and SPK\_2 are active! any common experience or idea how to set configuration like the User Guide? ---
**Author:** ![paruthiv](https://avatars.discourse-cdn.com/v4/letter/p/eb8c5e/32.png) [@paruthiv](https://forum.sierrawireless.com/u/paruthiv)\ **Post date:** [October 7, 2009, 1:09pm UTC](https://forum.sierrawireless.com/t/can-not-use-mic-2-as-single-ended-interface/1825/4 "2009-10-07T13:09:27Z")
hiiii In the documentations, AT Command Guide and WMP Dev Kit,the references to audio inputs and outputs are different. This makes confusion for us who want to configure these I/O. The confusion is faced because it is mentioned that Audio 1 and Audio 2 can be selected on the Wireless CPU. But Audio 1 and Audio 2 refer to the connectors available on the demo-board, and not on the module. Actually, the description should be something like this:- E.g. : Audio 2 (on demo-board) : Mic (from UGD) = MIC2 (from PTS/Dev Kit) Hfr (from UGD) = SPK2 (from PTS) Audio 1 (on demo-board) : Auxmic (from UGD) = MIC1 (from PTS) Ear (from UGD) = SPK1 (from PTS) I guess the issue has been raised with wavecom and the documentation would be corrected soon … hope this helps… cheers 😃 ---
**Author:** ![bandali](https://avatars.discourse-cdn.com/v4/letter/b/e36b37/32.png) [@bandali](https://forum.sierrawireless.com/u/bandali)\ **Post date:** [October 8, 2009, 1:31pm UTC](https://forum.sierrawireless.com/t/can-not-use-mic-2-as-single-ended-interface/1825/5 "2009-10-08T13:31:24Z")
Hi there, then could you check this message too? [http://www.wavecom.com/modules/movie/scenes/forums/viewtopic.php?f=45&t=3974](http://www.wavecom.com/modules/movie/scenes/forums/viewtopic.php?f=45&t=3974) ---
**Author:** ![sarab96](https://avatars.discourse-cdn.com/v4/letter/s/eb8c5e/32.png) [@sarab96](https://forum.sierrawireless.com/u/sarab96)\ **Post date:** [November 5, 2010, 9:51am UTC](https://forum.sierrawireless.com/t/can-not-use-mic-2-as-single-ended-interface/1825/6 "2010-11-05T09:51:10Z")
The documentation is still not fixed. (I agree with bandali’s comments above) AT command guide has at+speaker settings incorrect. at+speaker=1 and at+speaker=3 should be swapped. Unfortunatly I found this mistake after wasting a lot of time and effort.