A few questions about Audiolense
ChrisF1
I am considering the purchase of AL XO soon but have a few questions about its typical usage.
1. Is it safe to assume that Audiolense can do, at minimum, all the same things that someone can do with a program like REW when it comes to initial in room measurements? Does it offer Freq Sweeps, test tones...etc and if so what is the Freq Range of the sweep? It seems the typical is 20hz-20Khz but what if we pretend for a minute that my speakers play down to 1hz and up to 50Khz, can the Freq sweep be configured to cover that wide a range?
2. If my current stereo setup only consists of 2 Channels using passive speakers with their own built-in crossovers would any of the Crossover features in Audiolense even be usable for me initially?
3. If I later ADD a sub or two, can I use the Crossover features to create High/Low Pass filters to blend the main speakers with the Subs all in software alone? If so, would I then want to disable any DSP features found within the SUB itself assuming the Sub allows those features to be defeated?
Thanks for any details you can provide.
Bernt Rønningsbakk
Welcome to AUF.
1) Audiolense only uses log frequency sweep for measurement.* It is the most precise method to capture the impulse response. And the impulse response contains everything needed to create correction filters. There is no limit how low you can set the start frequency, but if you start crazy low (below 5 Hz), the sweep will spend a lot of time in the deep bass since it uses the same duration for each octave. Increasing the duration of the sweep will help, but there are other limiting factors. The measurement microphone is highly unlikely to be precise below 10Hz, and the length of the extracted IR is usually 1.3-1.4 seconds, which is too short for reliable capture of e.g. 1-2 Hz. Plenty enough for deep bass, but not for seismic research. 50 kHz is not a problem if you e.g. measure at 192 kHz.
2) No. But you still need the XO version for the best sound quality.
3) Yes, as long as you run the subs from separate audio outputs. You will probably be better off bypassing external DSP if you have the extra output channel on your sound card. but you will also get exceptional subwoofer integration with a regular subwoofer hookup with DSP engaged – when Audiolense only sees the sub plus the speaker as one unit.
*REW provides analyses that Audiolense do not have. You can export measasurements and simulations from Audiolense and load them into REW for analysis.
Mvh,
Bernt
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ChrisF1
One follow-up to response #3:
On my PreAmp I have two additional XLR Outputs currently unused which are said to be Full Range "Mirrors" to the regular pair of Outputs that send signal to my main tower speakers. My intention would be to use those "extra" XLR Outputs to feed a SUB/SUBS and then to defeat any internal DSP within the SUB itself since it would be redundant while using a program like AL to create these filters for use with JRiver..etc.
I will be using a Lynx Hilo "USB" for the signal feed into the workstation running Windows where AL would be installed. If I am capturing the signal sweep from a mono MIC (Earthworks M30) and Mono MIC PreAmp using, as an example, the Left Channel Analog XLR Input found on the Lynx Hilo, will there be a need to run separate individual signal sweeps for each Left/Right main channel (swapping cables/Inputs on the MIC/Hilo interfaces and disabling the each one of the Main channels one at a time in order to capture it by itself) during the measurement.
Alternatively, will doing a full sweep using both channels at once allow me to deal with and work on the Left/Right sweeps individually within AL if only using a Mono MIC and Mono MIC Pre? A situation I am thinking of is if one speakers output may perhaps be arriving at the listening chair before the other speaker due to room shape/design would doing individual sweeps allow me to better handle or deal with any delay's that one channel may require that the other channel does not require? Or, can all this still be done using just one sweep from a Mono Input with both main channels playing together?
Hopefully my explanation makes sense...Thanks again
Bernt Rønningsbakk
About the measurement: Audiolense sweeps all channels in one session, so there will be no need for cable swapping etc during measurement. This means that delay , polarity and relative spl is captured – and Audiolense captures all the info needed for perfect time & level alignment.
I am not sure if you can use the full range mirrors on the pre-amp, but I do not see the setup clearly from here. Anything that is to be corrected as a separate entity needs it’s own pipeline out of the computer and all the way to the speaker. Usually that means sound card channel – power amp channel - speaker/driver.
I hope this helps.
Alan Jordan
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