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#434034 - 10/27/19 11:25 PM Re: LFR1100 Active [Re: Mojo]
craigsub Online   content
connoisseur

Registered: 12/15/03
Posts: 1989
That's what the measurements do.
_________________________
LFR1100 actv, LFR1100, M100, M50, VP180HP, VP150, 3xEP800, M3, EP350, ADA1000-5, ADA1500-4 + 1500-6

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#434035 - 10/27/19 11:34 PM Re: LFR1100 Active [Re: Ian]
Mojo Offline
axiomite

Registered: 01/21/07
Posts: 7047
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
had v2;v4 FOC rock
Nx maybe

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#434044 - 10/28/19 08:22 AM Re: LFR1100 Active [Re: Mojo]
craigsub Online   content
connoisseur

Registered: 12/15/03
Posts: 1989
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.
_________________________
LFR1100 actv, LFR1100, M100, M50, VP180HP, VP150, 3xEP800, M3, EP350, ADA1000-5, ADA1500-4 + 1500-6

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#434045 - 10/28/19 08:23 AM Re: LFR1100 Active [Re: Mojo]
Ian Offline
President
connoisseur

Registered: 03/13/01
Posts: 1357
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
President & Chief Engineer

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#434047 - 10/28/19 08:46 AM Re: LFR1100 Active [Re: Ian]
craigsub Online   content
connoisseur

Registered: 12/15/03
Posts: 1989
Ian - Is the sound power curve as shown the complete system? Or is it the complete system plus the individual driver sets "spliced in?"
_________________________
LFR1100 actv, LFR1100, M100, M50, VP180HP, VP150, 3xEP800, M3, EP350, ADA1000-5, ADA1500-4 + 1500-6

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#434050 - 10/28/19 09:43 AM Re: LFR1100 Active [Re: craigsub]
Ian Offline
President
connoisseur

Registered: 03/13/01
Posts: 1357
The sound power curve is the complete system, just as you would listen to them at home.
_________________________
Ian Colquhoun
President & Chief Engineer

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#434051 - 10/28/19 10:23 AM Re: LFR1100 Active [Re: Ian]
craigsub Online   content
connoisseur

Registered: 12/15/03
Posts: 1989
Thanks, Ian. The development protocols were outstanding.
_________________________
LFR1100 actv, LFR1100, M100, M50, VP180HP, VP150, 3xEP800, M3, EP350, ADA1000-5, ADA1500-4 + 1500-6

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#434052 - 10/28/19 10:31 AM Re: LFR1100 Active [Re: Ian]
Mojo Offline
axiomite

Registered: 01/21/07
Posts: 7047
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
had v2;v4 FOC rock
Nx maybe

Top
#434056 - 10/28/19 12:13 PM Re: LFR1100 Active [Re: Mojo]
Ian Offline
President
connoisseur

Registered: 03/13/01
Posts: 1357
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
President & Chief Engineer

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#434057 - 10/28/19 12:30 PM Re: LFR1100 Active [Re: Ian]
Mojo Offline
axiomite

Registered: 01/21/07
Posts: 7047
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
had v2;v4 FOC rock
Nx maybe

Top
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