Category Archives: IR

Durie Hill recording

Durie Hill Tunnel IR

Recording balloon pops at Durie Tunnel, Whanganui – see earlier post
Excuse the wobbly cam – I had my little Sony a6300 hanging around my neck…
I’ll revisit this location and another much larger complex of tunnels to record sweeps for an eventual HISSandaROAR IR Library release…




I visited Durie Hill in Whanganui NZ which has this 213 metre long tunnel, with a vertical escalator/lift at the end, which takes you up to a panoramic viewpoint…

On first visit yesterday, performing handclaps was unreal as there is actually a flat wall at the end of the tunnel – the elevator entrance is around a corner… So a clap excites the verb in the tunnel, then a huge slap echo bounces back and excites the tunnel verb again! Depending where you stand when you make a sound, you can vary the time until the slap delay occurs & it got quite ‘zingy’ sounding & almost sounded like a ricochet at times…

This morning I went & got some balloons – I had my starter pistol in the car, but this is a public place… and I wasn’t keen for a Police armed offenders callout… Will see if I can deconvolve it into an IR…

Note to self: in future always have a pack of balloons in my recorder bag. The SPL and impulse from a ballon pop in such a confined space was VERY effective!



Echo Point

This is a location called Echo Point – when I first visited here 15 years ago, there was a sign saying ‘ECHO POINT – startling echo heard here!’
The next time the sign was gone and I wasn’t 100% sure I was in the right spot, so this time I was determined… The gravel track into the estuary is so people can launch their boats into that tidal stream (its part of a massive estuary)
I recorded hand claps and also Hyoshigi and they triggered the echos a bit but I also had a starter pistol with me and fired 12 shots at 2 distances, and the echos almost ripple/peel like thunder!
Recordered 32/192 MixPre10 with 8 channels: 8040×2, 8020×2, 70×2 and CUX100kx2, can’t wait to process & compare IRs!

This is from 15 years ago, recording with SD722 and Sanken CSS% stereo mic:

Echo Point, Takaka