I'm glad to see I'm not the only one to encounter troubles while recording with a H300 and a Sony ECM-MS907... The policy of Sony is to have its own standarts to prevent users to choose an other brand !
It's a kind of troll, but Iriver is doing the same by providing so little specifications of its products !!
Some of ours are satisfied by the couple, I'm really surprised. In all what I've tried, if the source is very close to the mic, it "works" because the sound wave power is very high. It's maybe the case for percussions that usually saturate recorders. As soon as the source is a bit further from the mic, the sound level is flatten and reaches the level of the digital noise.
Too bad, the ECM-MS907 is an excellent external microphone. By the way, I did not try to change the AGC option because in my mind, being for the internal microphone, it has nothing to do with ext. mic. recording.
I have no clue to make it works as it works with MD (you shoot a plane in the sky and you're flying with it!!). I guess that an adaptation of impedance is required through a preamplifier. The electronical chain would be similar to this.
Mic[Electret + preamplifier]=>Preamplifier_2(fo r impedance adaptation)=>jack line-in of the Iriver.
For the "preamplifier_2" , the power provided by the Iriver (like for a computer mic) can be used, and is about 2.5 Volts.
Anybody knows a circuit? Or an already made adaptation component that one can buy on the web?