« Reply #1 on: April 08, 2006, 03:06:46 AM »
I knew there would be a loss in gain when using the new "Sanjay" box vs my old Soundpro battery box, so I ran a quick test, using the 1/8" input on the MT at "M" sensitivity. Mics were 1" from the speaker, volume was not changed on either the MT or the stereo between segments. Levels on the SP box were at maximum, which still provides some slight attenuation. Stereo was set at a very modest volume, so as not to disturb other family members.
The net loss is about 5db, which is less than I expected. Here are the respective analyses from Adobe Audition
AT853 omnis > Sanjay BB > MT:
Left Right
Min Sample Value: -4109.32 -3545.87
Max Sample Value: 3682.54 3143.16
Peak Amplitude: -18.03 dB -19.31 dB
Possibly Clipped: 0 0
DC Offset: 0 0
Minimum RMS Power: -34.85 dB -36.04 dB
Maximum RMS Power: -27.59 dB -28.86 dB
Average RMS Power: -31.03 dB -32.4 dB
Total RMS Power: -30.96 dB -32.33 dB
Actual Bit Depth: 24 Bits 24 Bits
Using RMS Window of 50 ms
AT853 Omni > minixlr to 1/8" dongle > Soundpro BB > MT
Left Right
Min Sample Value: -6672.24 -5195.29
Max Sample Value: 7291.43 5677.31
Peak Amplitude: -13.05 dB -15.23 dB
Possibly Clipped: 0 0
DC Offset: -.001 -.001
Minimum RMS Power: -29.66 dB -31.42 dB
Maximum RMS Power: -23.24 dB -25.12 dB
Average RMS Power: -25.91 dB -27.85 dB
Total RMS Power: -25.86 dB -27.8 dB
Actual Bit Depth: 24 Bits 24 Bits
Using RMS Window of 50 ms
Nice work and +T. That sounds reasonable, about -6 to -10dB loss. But a lot nicer sound, and tolerant to loud volumes. So, if you're at very quiet shows, run the SP batt box I guess. Otherwise use the 3-wire one.
Richard
Logged
Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
** This individual has moved to user "illconditioned" **