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

(see links under the sound works tab in the menu)

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 sell commercially. The process is long & complex so the cost would be prohibitive.

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 both of the designs out there actually don't give users any lower frequencies than the JrF c-series contact mics can achieve & in addition, going by the recordings on websites, don't provide much in the way of clarity and, more importantly, recordings that have that sense of materiality. 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 €20-30.

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.

If you want to go below 10hz again don't waste your money unless you have an adaptation for your digital recorder as they all have a built in limiter at 10hz.

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 soons (you'll need headphones or full range speakers to get the full effect)

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