However, by leaving out the more advanced features in the Omnidrive, BSS has achieved dramatically lower prices, ensuring that Minidrive is suitable for a range of applications for which an Omnidrive would simply not have been affordable.The Minidrive is available in two models, the FDS-334T (with 2 inputs and 4 outputs) and the FDS-336T (with 2 inputs and 6 outputs). Missing cap on gain knob.Minidrive provides all four core functions of the Omnidrive range: crossovers (Linkwitz-Riley, Bessel or Butterworth), mid-band limiters, equalisation freely assignable to inputs and outputs, and both input and output delay.
I'll let you know if I can add to your data gathering.Up for sale a used BSS audio FDS-336T. I rather like this stuff! I'm hoping to get hold of EASRA to see how that tackles RT60. In fact, any measurement technique will probably throw up more questions than answers until you understand the technique's limitations and the degree of measurement uncertainty. Well I have decided to compare these methods of (RT60) measurement for my IOA Diploma and I am just making sure I can get my toys working with sanity before I start testing in earnest.
The manual seems to suggest placing Ld a little below the peak. However, if the Acoustilyser gives you a single figure reading, do you just accept it because a figure comes up on the screen?!
Strangely enough, even Siasoft weren't too forthcoming. >and then where I place the Ld Lr and Ln markers is NOT obvious to me. Have you got the British Standard for measuring reverberation time? If not, it's worth reading.Īlso, if you have a measured impulse, try the spectrograph to see if there is a difference.
arh but the NTI meter method also used the speakers. maybe directional and not eciting the room like the gun! yes this could be it. but then my speaker system is a stack of C7. >The results from the gun shot impuse are around 70% longer. I'm reading a paper that compares 5 different STIPA systems - all give different results! That's good to hear - it can be difficult to match different measurement platforms - even using the same techniques. >When I compare the RT60s from the MLS impulse to my NTI acouslizer (interrupted pink method). Then use it -) As a single channel measurement system MLS is quite good, although swept sine seems to be increasingly popular. and then where I place the Ld Lr and Ln markers is NOT obvious to me. arh but the NTI meter method also used the speakers.īugger. The results from the gun shot impuse are around 70% longer. When I compare the RT60s from the MLS impulse to my NTI acouslizer (interrupted pink method). The noise floor ends up only 12db below the impulse for a start. I can also use the USB Pre to capture my real gun shots. I am using this technique to capture the room response and then analyse the RT60 spectrum. The room impulse response is arrived at mathematically by correlating the origin sequence with the resultant measured signal. MSL is a technique where an encoded sequence is played, monitored and processed (it sounds like white noise but it is carrying a coded sequence). I am using a speaker system to excite the room with the MLS.