@rauliruegas A pair of Velodyne HGS12 subwoofers are controlled by the Trinov program. Crossover point is set at 58Hz and the crossover is a 4th order Linkwitz-Riley. I have other crossover types available to me, such as various Bessel or Butterworth. Martin Logan lists 56 Hz +/- 3DB as the bottom end of the speaker. There are separate EQ programs for each channel installed, so I can affect each subwoofers or main speaker. So, I can manually add a bit of extra boost in the small hole that is created by the half wall. I have yet to do so, as I really do not hear a need, but I imagine I will do that one evening to satisfy my curiosity.
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With h the Trinnov and other high end digital preamplifiers, isn’t there a AD conversion as the very first step in any way you use the device? Not just “at some point”? Also, if 53 Hz is the bottom end for the CLX, wouldn’t you want to cross it over an octave or so higher, so as to make for a smooth transition? But maybe you’ve tried that before settling on 56Hz.
@lewm I don’t have the schematic to say at what stage the AD conversion occurs. Is it the first step, or does something else happen? So that is why I say at some point. We can say for sure that it occurs between before the output stage, and it me the exact point does not really become that large of a sticking point.
I can certainly experiment with different crossover points. I have just gotten things optimized for what I have now. What I do know is that anytime I make a change in configuration, and changing x over points will change dispersion patterns, this means I will have to run new calibrations, and that is an involved process. So its just not a matter of changing an input on a screen and saying this sounds better than that.
This is currently what I have set up. Top is before calibration, middle is after DSP correction.
Dear @neonknight : Thank's. So you are using the subs as bass reinforcement wider bass frequency, nothing wrong with that.
The bass subs wider frequency in that frequency range is not the main purpose of true subs ( as yours. ) but a side benefit. The main purpose for the room/system is try to lower the IMD and THD distortions levels from the main speakers.
Yours crossover at 360 hz and that means that the frequency range from around 35hz to 400hz is running in that part of the pannel developing those high distortions especially the Intermodulation and if you crossover ( high pass ) the main speakers at 100hz and from there the subs you will lower those distortions that certainly affects the integrity of the audio signal reproduced by the ML, so you can win a lot at every frequency range doing that: your system quality level performance will improves over what you have rigth now.
Yes, as you explain it you have to run that " involved process " but you can try and can attest the rewards. There is no way not to achieve those rewards. Of course that maybe you like the change or maybe not but this is a different issue.
I just saying because putting at minimum any kind of distortions in any room/system always put us " nearer to the recording ".
@rauliruegas The thing to remember is the NATURE of the bass. Planar open baffle style bass is different in terms of attack, harmonics, and decay than conventional woofers. Even if they are in sealed boxes and servo controlled. The higher you bring the crossover the greater the risk of hearing the difference in the nature of the speakers and subwoofers.
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