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JrF

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    UK
  • About
    sound artists, field recordist, microphone builder
  • Interested in Sound for Picture
    Yes

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  1. Hi, there are one or two tests online between JrF hydrophones & aquarian, dolphin ear & the no longer available DPA's (the Ambient ones are very similar). wanted to comment on one or two points in the thread: 1) there is a vast, vast difference in performance between the aquarian & the DPA's - massive. That's partly down to the pre-amp in the DPA's + the superior capsule & cable but also they are built for use at depth & so they react differently to pressure & the effects of that on sound transmission. The signal from AQ's is around 1/4 of that from the DPA's so i'm not sure how someone in this thread got a higher level from them - but perhaps phantom wasn't turned on (which is needed for the DPA's). I have a pair of aquarians (2nd pair as first set failed & aquarian refused to repair or replace after less than a year) but there are two main issues with them: the handling noise is quite poor due to the way the cable is connected to the capsule & there's an issue with background noise caused by impedance matching issues (same goes for the new Dolphin Ear pro's & the Cetacean Research hp's). Some folks also report that there's a rusting issue on the newer aquarian's & the same water ingress issue over time. 2) The Trace contacts have a number of issues, which others might be able to comment on. They're a bit noisy & have thin mid & low freq. response. The Barcus Berry's are good mics but they're built for instruments so are calibrated to omit some frequencies that those of us interested in abstract sounds actually want (surface resonance etc). Working with building mics with these technologies over the years have been interesting on various levels, such as how to get much better mid & low frequency response (which involved using ceramic welding & various construction methods). both contact mics & hydrophones can really open up totally new sound fields - they're useful for altering ones perception of our surroundings etc.
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