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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: My Magnepan 1.6QR DIY Upgrade II: Going Active!! posted by dumpingground on January 30, 2012 at 09:46:57:
Again a acknowledgement to Neolith. (I hope I am not spreading it on too thick, but I really appreciate his help.)
If you don't want to read this entire post, the short answer is that Neolith's simulated results have been proven to be spot on correct with my measurements before/after with REW.
REW = http://www.hometheatershack.com/roomeq/
Neolith's original crossover plot and recommendation is here:
http://db.audioasylum.com/mhtml/m.html?forum=mug&n=176456
If you look at his simulated recommendations, you will see that they very closely match the REW live measurements I am posting here.
Some notes first.
My REW measurement mic is a good one, but is NOT calibrated. So the measurements are useful for comparison to themselves but should not be used to come to any absolute frequency response of the Magnepan 1.6 speakers.
I measured just the right speaker. My mic was about 30" from the speaker pointed at the center of the speaker. I measured both the high/tweeter and low/woofer panels with the active and then the passive crossover. I then disconnected the high panel measured both. Then disconnected the low panel and measured both crossovers.
Also, my frequency sweeps concentrated on the crossover region, I did not make full 20-20Khz sweeps.
And lastly, you will see that the passive crossover measured 1-2db higher in output then the active. This is due to a change in the gain on my measurement setup. Remember that my passive crossover is stock, but with upgraded caps/coils in an external box. The woofer coil has a slightly lower DCR then stock.
You can see high rez versions of these screen shots here:
http://davidmphoto.smugmug.com/Other/minidsp/
Without further delay. Here are the results.
1. Red is the passive nearly stock crossover. Green is the minidsp active crossover.
2. Passive Crossover Response, tweeter/high and woofer/low panel plus combined response.
3. Active Crossover Response, tweeter/high and woofer/low panel plus combined response.
4. Both crossovers on one graph for comparison. Gold is the passive Low Pass Woofer curve. Purple is the Active Low Pass woofer curve. The blues are the High Pass tweeter curves which are so close that they are on top of each other.
5. Phase relationship thru the crossover region. Red is the passive crossover. Geen is the active crossover.
very nice.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- REW measurements passive vs active crossover - dumpingground 02/2/1218:30:35 02/2/12 (0)
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