Howdy folks, pls bear with me if this post is unnecessarily long. I'm trying to buy a few digital voice recorders (DVR) to do some recording. I had previously gotten 2 olympus WS 100, but it didn't turn out to do the specific job that I wanted, especially quality wise. So I am in the market again. Now here's the thing. The main things I'm looking for in a DVR is high quality recording and long recording time - minimum of 9 hours, and long battery life, minimum of 9 hours. So far the DVR's I've seen that seem to have the potential to do my job are the DVR's in the Olympus stables. For eg. http:// http:// Just click on the various models on the middle left side of the page for more DVRs. Now... Lets analyze the WS 210 and DS 30. As I'm not very technical, and the reason I know this is much bcos of the about $200 I 'wasted' in buying the WS 100 (cost price and shipping) as I did not know what to look for in a DVR. And as I am hoping not looking to do any more unnecessary 'wasting' of money to learn what I must, hence this long post. So I'm thinking, given that those 2 models already have other features I am looking for: Long battery life (13 and 32 hrs,) Long recording time (35 and 17 hrs in HQ mode). I am now thinking that the last main pointer is to get the right recording quality to match thees other features. For example, WS 210: Sampling Frequency Stereo XQ Mode: 44.1 kHz Stereo HQ Mode: 44.1 kHz Stereo SP Mode: 22.0 kHz HQ Mode:44.1kHz SP Mode: 22.0kHz LP Mode: 8.0kHz Overall Frequency Response Stereo XQ Mode: 150-17,000Hz Stereo HQ Mode: 150-15,000 Hz Stereo SP Mode: 150-9,000Hz HQ Mode:150-13,000Hz SP Mode: 150-7,000Hz LP Mode: 150-3,000Hz DS 30: Sampling Frequency STXQ/STHQ/HQ: 44.1 kHz /SP: 22 kHz /LP: 8kHz Overall Frequency Response STXQ: 50-19000Hz/ STHQ: 50-16000Hz/ HQ: 50-13000Hz/ SP:100-8000Hz/ LP:100-3000Hz Can anyone pls explain to me the diff btw Sampling Frequency and Overall Frequency Response and how these affect quality. Also what Overall Frequency Response should I be looking at for best quality? I think I have established that anything below 44.1Khz is not good for quality. My limited experience tells me that anything below 44.1 Khz is not good enough quality wise. is this correct? So since both DVR's have recording time to quality ratio of: HQ mode: 17 hours 00 minutes (DS 30), and HQ Mode: 35 hours 25 minutes (WS210) and as both of these HQ modes record at 44.1Khz then I am on the right track yes with either of these items yes? is there anything else I should be looking at/for quality wise? Next, I think I have learnt a bit about the importance of the sound input device, as I will be using a lav/clip-on mic for these recordings... Going by the 680 ohms impedance (DS 30) and 2 kohms impedance (ws210) are these figures good enough to give me a good quality input??? If not what impedance figures should I be gunning for for good quality input, both for this DVR and any mic that I get to use??? Lastly, is there any other general advice you can offer me? Perhaps other DVR's I shoud look at? Bear in mind that I have a budget of about 150$ for each DVR. For eg, some1 suggested http://www.zoom.co.jp/english/products/h2/ but it falls short in recording time and battery life. Thanks for your patience and help. God bless.