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

salts

room tone

audible silence

Elusive fields



(HEADPHONES OR CONVENTIONAL SPEAKERS REQUIRED - MOST FREQUENCIES WILL BE INAUDIBLE THROUGH COMPUTER SPEAKERS)



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 some geophones are available online, for audio use. Now, this is where it gets tricky;

My motivation for writing here is to ensure folks understand what is possible and whether they can achieve what they want to. As I said I don't sell geophones so this isn't about competition. That said what I can say is that the JrF c-series contact mics can achieve frequencies into the infrasound range when used with higher specification recorders / pre-amps. In addition, the tests I've done myself show that they have much wider clarity and, more importantly, a sense of materiality. 

Additionally, importantly, almost all digital recorders have built in limiters that can't be turned off without hacking, 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 all of the more recent designs on the market 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 lots of those low frequencies whilst also providing a lot of detail and, I believe, a more engaging overall sound.

To demonstrate what can be achieved with the c-series contact mics that could be said to be geosonic (down to 10hz) do take a listen to various recordings of mine made with them, such as these (you'll need headphones or full range speakers to get the full effect);


update: with an increasing number of folks interested in recording with geophones, I have decided to put online some tests I carried out with three devices.

geophone tests: on stones in river;

1) c-series contact mics
2) commercially available geophone (europe)
3) simple geophone element purchased via ebay
4) JrF adapted geophone without hacked recorder & software
5) JrF adapted geophone with hacked recorder & software


on river fence;

1) c-series contact mics
2) commercially available geophone (europe)
3) simple geophone element purchased via ebay
4) JrF adapted geophone without hacked recorder & software
5) JrF adapted geophone with hacked recorder & software 



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