Robert Macy wrote:

Need a sound recorder for recording noise intrusion from an adjacent
tenant.

Using Sony ICD-SX700 did not achieve very good results.

What should I use?

The recorder isn't as important as the microphone and the playback
loudspeaker.

Is the noise coming through in one place (e.g. hammer drilling or tap
dancing) or is it diffuse? If it is diffuse, an omnidirectional mic
might work best.

If the noise is predominantly low frequency (e.g. boom box) a cheap
omnidirectional mic will generally have a better low frequency response
than a cheap cardioid. The big problem you will have with L.F. noise is
demonstrating it realistically to someone, because loudspeakers are
rarely flat at such frequencies and the bass from headphones will depend
on their positioning on the listener's ears.

Investment in a cheap analogue sound level meter will help; then you can
calibrate the recording level and match the playback level to it when
you come to demonstrate the problem. Use the dBC scale if the noise is
predominantly L.F.

--
~ Adrian Tuddenham ~
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www.poppyrecords.co.uk