Rick, what did you mean by "good speaker system"? Are you wanting to have good "Hi Fidelity" sound? Chances are not good. You might be able to pick up low level sounds, but phone system still have a limited bandwidth. Typically, from memory, we are talking about between 300Hz to 3000Hz. It might only be 500Hz at the low end.

I'd have to say, if you want accuracy, may I suggest trying one of the i-phones? I have never used these, but they might be better in that respect.

Good luck.