Hi there. I'm hoping to do all the calibration of my 9.1.4 atmos system using GLM, but I'm a bit confused on whether or not I need to get a 9301 unit, or some other external bass management do properly bass manage it. A bit about my current system:
I have 13 8330 A monitors and one 7360 A subwoofer in a 9.1.4 atmos configuration
All 14 speakers are connected to a GLM network.
I am using AES digital inputs for all of my speakers and subwoofer
My interface is a DAD AX Center. I use it with a DADmom to control volume. With the DADman software I can also bass manage and set filters / crossovers, but in my testing I prefer how the automated GLM software does the EQ
My dilemma is that currently, I am using DADman to bass manage the system because I'm a bit confused on whether I have everything I need on the Genelec side to to bass management and LFE via the GLM software. In the GLM manual, the closest system description is in section 4.2.8 - "Digital Audio 5.1 with a 7300 Series Subwoofer with 9301". This implies that I would need a 9301 to do an all-Genelec calibration via GLM, including bass management. However, this goes against some other documentation you have on the website which implies that I should be able to set up distributed bass management filtering local to each speaker. This is where the confusion lies for me.
What I'd like to eventually set up is to have AES going to each speaker as it currently is, and then have bass management going to the subwoofer on it's Digital channel A and LFE to digital channel B. It's no problem for me to duplicate my bass managed channels using my interface, so if GLM is capable of taking care of the filtering local to each speaker then theoretically this system should work without a 9301.
I'm hoping someone with more experience, or perhaps someone from Genelec could chime in and fill in the gaps here.
In the meantime, I'm really enjoying the system so far and am incredibly impressed with the sound!
Thanks
Alex G
Comments
Hi Alex! Looking at the Genelec side only, the 9301B would be needed, because our 73xx-series subwoofers only offer multichannel bass management in the analog domain. The 9301B passes incoming digital signals to the speakers and creates a summed signal for the subwoofer (which contains all the channels you want to be bass managed, selection is done in GLM). This solution also gives you a high flexibility for selecting crossovers.
In general, you can of course also use external bass management from your source. Just ensure that you also create a sum for the subwoofer. GLM always calibrates all devices in full range, so you only have to take care that bass management crossovers match (high cut for the sub <> low cut for the speakers). Therefore, I would realise both filters with the external device.
Greetings!
Thanks Marcel.
Given that I currently have the ability to create a summed signal to the subwoofer using DADman, would that not be enough in this case? I'm imagining a scenario where I send full range to all speakers, plus a summed full range send to the subwoofer, and then apply high pass / low pass using the Genelec DSP. Is that possible, or am I misunderstanding the features available on the speakers?
Sorry for the delay, Alex!
In general, it's no problem to create an external sum for bass management. But this one should have a lower crossover (for example 85 Hz), compared to the discrete LFE channel (usually plays up to 120 Hz). With our 9301B we allow this and take also care of the headroom needed for the processing of the sum. The low cuts used by GLM within the speakers also cannot be set manually without GLM "seeing" a bass management device. As said, if you would like to do it, the external device will have to set all the filters and the levels for summing. You could then feed the sub sum on the left channel (flag A), and the LFE on the right channel (flag B) of one AES/EBU line. Greetings!
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