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Re: LFR1100 Active
Mojo #434034 10/28/19 03:25 AM
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That's what the measurements do.

Re: LFR1100 Active
Ian #434035 10/28/19 03:34 AM
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I'd spin it as a system and take data. Then mute the fronts, spin it some more to get the data for the rear. Subtract the data from the two spins to get the front contribution. The subtraction has to take place on a per-curve basis of course.

That's what you meant, right? smile


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: LFR1100 Active
Mojo #434044 10/28/19 12:22 PM
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No. You are measuring it as a system. The data is coming from the front and rear for the entire measurement. If you want the front contribution only, do a pair of M100's.

Re: LFR1100 Active
Mojo #434045 10/28/19 12:23 PM
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Ian Offline OP
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I do the spin for each driver set and the complete system. This is six spins for an LFR1100 Active. This gives a view of all the on and off axis responses in play. Then things get tedious as you need to work out how to combine these to give you both the on and off axis summing you are trying to achieve. As to how many more spins that will take is anyone's guess. For the LFR1100 Active it was around 80 with double-blind listen testing in-between a bunch of them.


Ian Colquhoun
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Re: LFR1100 Active
Ian #434047 10/28/19 12:46 PM
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Ian - Is the sound power curve as shown the complete system? Or is it the complete system plus the individual driver sets "spliced in?"

Re: LFR1100 Active
craigsub #434050 10/28/19 01:43 PM
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Ian Offline OP
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The sound power curve is the complete system, just as you would listen to them at home.


Ian Colquhoun
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Re: LFR1100 Active
Ian #434051 10/28/19 02:23 PM
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Thanks, Ian. The development protocols were outstanding.

Re: LFR1100 Active
Ian #434052 10/28/19 02:31 PM
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I'm curious if the driver cross-over filter slopes for the active are more aggressive.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: LFR1100 Active
Mojo #434056 10/28/19 04:13 PM
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Ian Offline OP
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The best word for these slopes would be "customized", as we are after a combined off-axis response as opposed to a dB per octave. The amount of "customizing" that can be done when you are fully active is increased dramatically as you have a DSP at your disposal for every crossover point.


Ian Colquhoun
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Re: LFR1100 Active
Ian #434057 10/28/19 04:30 PM
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Aye, Ian. They are BESPOKE for the active LFRs! They have curves only an engineer or audiophile could love.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
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