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Old 22nd July 2013, 08:29 PM   #1
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Default Apogee Centaurs- going active

I have just built two 2 channel symasym amps and shoe-horned them into the stands of my Apogee Centaurs, removed the factory crossovers and have connected a 2-way minidsp and presently trying to optimize the crossover in anticipation of (maybe) an improvement over the passive devices.
Most of you, am sure are much more proficient at evaluating crossovers than I, and I would like suggestions on how I should implement the standard crossover functions into my minidsp. The stock crossover is found here:

http://www.apogeespeakers.com/projec..._crossover.jpg

The woofer appears to be crossed with BW second order at about 450hz, but I'm having trouble decifering the tweeter section. Nominal tweeter ribbon resistance measures 6 ohms, I think.
I am running the ribbon with single order BW at 800hz and then a fairly steep low shelf at 225hz. Doesn't sound too shabby but can it be improved?
Any suggestions how to interpret the stock crossover will be appreciated.
Peter
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Old 28th July 2013, 12:26 PM   #2
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Apogee Centaurs ELECTRIC HERE.
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Old 28th July 2013, 04:16 PM   #3
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Many thanks. It appears that the ribbon has a steeper slope. I'll play around with it.
What is the source of this graph?
Peter
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Old 28th July 2013, 04:46 PM   #4
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You are welcome Peter.
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Old 13th November 2013, 02:18 PM   #5
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Default Ported Centaurs

After considerable modding, evaluating etc all in an effort to improve on the stodgy overstuffed bass performance of my long lived Centaurs, I built a new 1.3 cu ft ported cabinet and a new baffle with ribbon faceplate made from solid cherry and rehoused the original drivers. What a difference!
My listening room is fairly small(15' x 13' or so with sloped ceiling) and I have never had success trying to blend a subwoofer into any speaker in this room. Now I don't need one.
The bass is more relaxed, very deep and dynamic with dual Symasym amps located in the original Centaur stands. Now crossing over at 500Hz LR4 with a minidsp. These are again my reference for my speaker building hobby. Over the past couple of years, I have had(and still have them), Royds, Frugalhorns, ZD5, 8" vifa/xt25 waveguide concoction using this same cabinet all in an attempt to build a satisfactory replacement for the Apogees. The waveguide came closest and I am currently building a TMM waveguide using 6.5" peerless nomex woofers with the xt25.
After living with the transparency of the ribbons for 22 years, it may be nigh impossible to find a suitable alternative.
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Old 13th November 2013, 05:37 PM   #6
tyu is offline tyu  United States
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Vary nice.....Thanks for the pic......
I have the Minors............an Stages.........why has know one copyed these Centaurs 26" free hanging MT ribbons two ways??..............
Hard to see why Magnepan sued Apogee for copy there speakers.....i have Manepans.........lot of fun...but all i see/hear that Makes Apogee like Maggys...is thay bouth use Aluminum!..............even the big maggys are not close to the sound of Apogges............go fig
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Old 22nd November 2014, 11:07 AM   #7
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Default Next iteration of my Centaurs

Recently I went rather drastic with my Centaurs.
About a year ago I picked up a pair of Infinity 8 Kappas in a local thrift shop that needed some tlc. When I got them up and running, it became quite apparent that my modded reflex ported Centaurs were still lacking in the bass department. The sheer weight of bass instruments through the Kappas is really convincing.
So I pulled some sealed boxes that I had long ago used as subs from storage and installed a Dayton 10" woofer in each, removed the woofer enclosure from the Apogees and secured the home made front panels of the Centaurs to the top of the sub enclosures, suitably trimmed to 12" wide to match the width of the subs. I made a rear single brace to support each ribbon panel.
I played around with crossover points and have arrived at 400Hz, 48db high pass and 24db low pass with my minidsp.
The result is quite stunning. Not only is the lower register hugely improved, but there is now an entire wall of sound with huge soundstage and super imaging to a level that I had never experienced before-and I've had these Apogees for 23 years. I credit this transformation, in part to the removal of the rear woofer enclosures that were possibly limiting the reflected sound from the original Centaurs.
The Kappas are now for sale.
Peter
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Old 22nd November 2014, 05:27 PM   #8
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Those 26" Stage mrt are a very nice sounding ribbon, always had the temptation of spilting my Acoustat 2+2's and putting to mrt per side in the center and cross them wherever sounded best with driverack. The mrt really intergrates with them well, I ran both Stage and Acoustat parallel off 1 stero amp trying it out.
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Old 22nd November 2014, 05:41 PM   #9
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This is very interesting. I have a pair of minors awaiting new ribbons and I am seriously considering a range of changes and the same time. My concern is first working out why a number of things were done before I make changes. Once I can tick off those that were done purely for cost and aesthetics I can get down to the potential improvements...
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Old 22nd November 2014, 05:57 PM   #10
Davey is offline Davey  United States
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Very good. Did you try going below 400Hz with the crossover frequency? Too much ribbon movement if you do that?

Dave.
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