I've been working extensively with geophones that I adapt for audio for quite a few years now (inc. on the following projects;


room tone

audible silence

Elusive fields

I'm often asked about them; where to buy them, do I sell them etc. but the ones I adapt & use aren't something I can yet sell commercially. The process is long & complex so the cost would be prohibitive and I have also built software for working with the resulting recordings. 

I've noticed that there are a couple of other mic builders selling geophones for audio use. Now, this is where it gets tricky. My motivation for writing here is to ensure folks don't spend money on something that might not achieve what they want. As I said I don't sell geophones so this isn't about competition. That said the designs out there actually don't give users much lower frequencies than the JrF c-series contact mics can achieve when used with higher specification recorders / pre-amps & in addition, going the recordings i've heard, don't seem to have much clarity and, more importantly, a sense of materiality. Additionally almost all digital recorders have built in limiters meaning its impossible to record sounds below 10hz.

If folks still want to give working with geophone elements a go then the ones used in those designs are available across the internet for around €20-40.

It is possible to buy or loan higher spec geophones, like the ones I use, but they tend to be scientific instruments and quite expensive. This is one of the reasons I use hand built elements in the c-series contact mics - to give folks those low frequencies, down to 10hz, whilst also providing a lot of detail across frequencies.

To demonstrate what can be achieved with the c-series contact mics that could be said to be geosonic (down to 10hz) i'll post a few examples soon (you'll need headphones or full range speakers to get the full effect)

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