yikes - hope this doesn't apply to Motu's avb series too - I just got a 24 ao and am thinking if a 24 ai....
On 27 June 2017 at 11:37, Richard Lee <rica...@justnet.com.au> wrote: > There's a number of issues brought up in this thread which Core Sound have > been aware of for some time and have been attempting to address. But its > difficult for a small company to make major changes on the small turnover. > > For what its worth, the 'new' PPAc will give around 1dB improvement in > perceived S/N regardless of your favourite weighting (more if you are not > using a Metric Halo or similar). This has been achieved mainly by a bit > more than 1dB more output. 8>D > > The MOTU Traveler has near SOTA noise performance but the design is flawed > and they often become very noisy over time. If you have one which has been > OK for more than 12 mths, you are probably OK > > I'm on my 3rd Traveler. The 2nd one developed the noise almost exactly 12 > mths after I received it. As the 1st took 3 mths to be 'repaired', those > of us in Oz are not happy bunnies. (The Traveler is actually Angelo > Farina's who kindly lent it to Cooktown Recording and Ambisonic > Productions.) > > Its pretty obvious MOTU don't have in-house design expertise and they deny > there is a problem. I've not looked inside a MOTU 4pre ... but so far, > those we know of haven't developed this problem so it has our cautious > recommendation. > > In terms of noise with TetraMic, I'd expect a 'good' Traveler to be on par > with Sound Devices and Metric Halo (sadly Mac only) and you would notice > the noise difference between these and the DR680 which is our > recommendation for an inexpensive portable device. > > My experience is if you are not recording bird song in the Norfolk Broads, > the noise performance of TetraMic wth the above good preamps is not a > problem. There are some excellent recordings on Ambisonia from John > Leonard & Paul Hodges .. some of which were made in a very quiet studio. > > That's not to say we aren't working on even better performance ... 8>D > ___________________ > > (There are problems with noise on the P48V on early DR680s and Paul Hodges > has a mod for these on Channels 1-4. I believe, TASCAM, Europe were > modifying Mk1 DR680s and the new one has sorted this out. > > If you have an old DR680, it is worth doing Paul's mod as it affects some > mikes, both $$$ & inexpensive. TetraMic is actually pretty immune to P48V > noise.) > __________________ > > If you have a good A/D without preamps, you can build a 4 channel preamp > using THAT chips with near SOTA performance. > > Bear in mind you need to match THAT 1510s & 1512s for gain. The internal > resistors are laser trimmed for CMR but the absolute values differ from > chip to chip. Thanks to David Pickett for this tip. > > If you prefer to use SSM2019 or TI INA163 chips, use them with the latest > THAT circuits for more reliable long term performance. All three are > capable of excellent performance in the right circuit. > > It's the protection scheme that is flawed on the SSM, TI & (very early) > THAT circuits. The correct protection is cheapo 1n4004 diodes, preferable > Glass Passivated 1n4004GP. > > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -- Augustine Leudar Artistic Director Magik Door LTD Company Number : NI635217 Registered 63 Ballycoan rd, Belfast BT88LL -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20170627/5e7f5718/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
