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<blockquote data-quote="John Roberts" data-source="post: 138528" data-attributes="member: 126">Re: Behringer X32 has a air leak in the mains!While most home hifi products are closer to -10dBV than +4dBu, they are not actually nominal -10dBV= 0VU, if anything more like 500mV=0VU. The -10dBV standard is left over from the small format (narrow track) open reel tape machines very popular in the 1980s for bedroom/project recording set ups. The lower voltage nominal 0VU supported 20dB of signal headroom while using cheaper lower voltage power rails. Another subtle benefit of the -10dBV standard was that the slow (0.5v/uSec) op amps common back then were fast enough to reproduce audio within those lower voltage rails.&nbsp; -10dBV was always considered the amateur or pro-sumer standard, while +4dBu was the big boy professional reference standard. JRPS I wrote a column on the subject back in the &#039;80s comparing performance of both and +4 had a very slight noise floor advantage over -10dBV, but the performance differences between them were mostly inconsequential.</blockquote>

[QUOTE="John Roberts, post: 138528, member: 126"] Re: Behringer X32 has a air leak in the mains! While most home hifi products are closer to -10dBV than +4dBu, they are not actually nominal -10dBV= 0VU, if anything more like 500mV=0VU. The -10dBV standard is left over from the small format (narrow track) open reel tape machines very popular in the 1980s for bedroom/project recording set ups. The lower voltage nominal 0VU supported 20dB of signal headroom while using cheaper lower voltage power rails. Another subtle benefit of the -10dBV standard was that the slow (0.5v/uSec) op amps common back then were fast enough to reproduce audio within those lower voltage rails. -10dBV was always considered the amateur or pro-sumer standard, while +4dBu was the big boy professional reference standard. JR PS I wrote a column on the subject back in the '80s comparing performance of both and +4 had a very slight noise floor advantage over -10dBV, but the performance differences between them were mostly inconsequential. [/QUOTE]

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