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Re: LFR1100 Active
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Joined: Dec 2003
Posts: 2,021 Likes: 1
connoisseur
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connoisseur
Joined: Dec 2003
Posts: 2,021 Likes: 1 |
That's what the measurements do.
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Re: LFR1100 Active
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Joined: Jan 2007
Posts: 10,490 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,490 Likes: 116 |
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?
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated
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Re: LFR1100 Active
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Joined: Dec 2003
Posts: 2,021 Likes: 1
connoisseur
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connoisseur
Joined: Dec 2003
Posts: 2,021 Likes: 1 |
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.
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Re: LFR1100 Active
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Joined: Mar 2001
Posts: 1,387 Likes: 8
President connoisseur
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OP
President connoisseur
Joined: Mar 2001
Posts: 1,387 Likes: 8 |
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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Re: LFR1100 Active
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Joined: Dec 2003
Posts: 2,021 Likes: 1
connoisseur
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connoisseur
Joined: Dec 2003
Posts: 2,021 Likes: 1 |
Ian - Is the sound power curve as shown the complete system? Or is it the complete system plus the individual driver sets "spliced in?"
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Re: LFR1100 Active
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Joined: Mar 2001
Posts: 1,387 Likes: 8
President connoisseur
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OP
President connoisseur
Joined: Mar 2001
Posts: 1,387 Likes: 8 |
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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Re: LFR1100 Active
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Joined: Dec 2003
Posts: 2,021 Likes: 1
connoisseur
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connoisseur
Joined: Dec 2003
Posts: 2,021 Likes: 1 |
Thanks, Ian. The development protocols were outstanding.
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Re: LFR1100 Active
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Joined: Jan 2007
Posts: 10,490 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,490 Likes: 116 |
I'm curious if the driver cross-over filter slopes for the active are more aggressive.
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated
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Re: LFR1100 Active
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Joined: Mar 2001
Posts: 1,387 Likes: 8
President connoisseur
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OP
President connoisseur
Joined: Mar 2001
Posts: 1,387 Likes: 8 |
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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Re: LFR1100 Active
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Joined: Jan 2007
Posts: 10,490 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,490 Likes: 116 |
Aye, Ian. They are BESPOKE for the active LFRs! They have curves only an engineer or audiophile could love.
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated
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