Will do...I am currently waiting on a friend to mail me several different Eminence XO's to play with.
I did this over the weekend.. 10-CX, with the pre-fab XO and it sounds surprising nice for not being broken in and a test box... After the holidays I will build a more permanent home / box for it.
I figured for sure the CD would need more than the supplied 3.5db attenuation but it works.
That is great news - I think I may go that route -- Beat 10 - CX, prefabbed XO and the ASD:1001.
Hi rkondra,
Can you put up the crossover diagram with the compensating parts and values.
The first order crossover is interesting. Wonder how the main driver sounds with that ?
How do you find the sound ? Did you compare with any commercial speakers ?
Thanks.
Hello Ashok,
Though this xover uses a single filter element per driver, it is definitely not first order acoustic. Much more so than the CX10, the Beta 8 has some response issues up top, and the tweeter roll off is far from textbook, but the net result is OK for me.
The xover schematic is up. I placed two switches to adjust response externally. The woofer switch defeats a contour that deals with a midrange prominence. The two tweeter switches alter the tweeter zobel, effectively attenuating the tweeter.
I almost always leave the woofer contour in - circuit. The midrange prominence makes the speaker a little shouty, masking the bass and treble.
My reference axis is 15 degrees. (L&R straight ahead, no toe - in) With the tweeter zobel switch S-TZOB1 closed and S_T_ZOB2 open this yields a flat measuring and correct sounding response.
My center channel is at 0 degrees, where closing both switches on the tweeter tames the top octave + on - axis rise. With switches so arranged, I do not get any image spotlighting with all speakers active.
The sound to me is completely satisfying. Best overall that I have heard. The on and off axis response is in phase throughout the crossover region with > 20dB null with tweeter polarity reversed. I have become sensitive to small phase anomalies in the crossover as result of playing with speakers too much, and these are spot on. Sibilants have no ch ch, no spit, just right. Sensitivity is really good, and they will play cleanly with no sign of distress as loud as I care to listen (105 dB or so) with mid power amplifiers.
I have heard HI FI speakers with a little nicer this and that, but they would all melt while these are loafing.
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Hi rkondra,
Thanks. Yes, I was also concerned about the peak in the driver causing it to shout . I have been trying the driver with the Eminence crossover and it didn't seem to shout. But I have not tried it long enough and with different material.
Lots of experimenting ahead ! Thanks again for posting your crossover. I'll post results as soon as I have something significant to talk about .
Thanks. Yes, I was also concerned about the peak in the driver causing it to shout . I have been trying the driver with the Eminence crossover and it didn't seem to shout. But I have not tried it long enough and with different material.
Lots of experimenting ahead ! Thanks again for posting your crossover. I'll post results as soon as I have something significant to talk about .
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Hi Ashok,
I am looking forward to seeing what you get. The shout I mentioned is a low Q thing centered about 6-700 Hz. Not really a peak in the driver response, but more like two things creating a slight (2dB) hump. First is the diffraction loss that, with my baffle, begins around 300 Hz and drops below, and the Beta 8's natural suck out at 1Khz. These put together net a rise in the octave or so in the middle.
Subjectively, this makes the speaker sound loud, without much kick in the bass or excitement in the treble. The contour network sets this right.
You should be in much better shape with the CX10. Just watch that tweeter - it has a really healthy impedance rise at resonance, and a smooth but pronounced rising response with dropping frequency.
Regards
I am looking forward to seeing what you get. The shout I mentioned is a low Q thing centered about 6-700 Hz. Not really a peak in the driver response, but more like two things creating a slight (2dB) hump. First is the diffraction loss that, with my baffle, begins around 300 Hz and drops below, and the Beta 8's natural suck out at 1Khz. These put together net a rise in the octave or so in the middle.
Subjectively, this makes the speaker sound loud, without much kick in the bass or excitement in the treble. The contour network sets this right.
You should be in much better shape with the CX10. Just watch that tweeter - it has a really healthy impedance rise at resonance, and a smooth but pronounced rising response with dropping frequency.
Regards
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If crossed around 1500Hz none is needed as the acoustic center of the woofer is back far enough and the acoustic center of the CD is far enough forward so that they match up almost perfectly.
I think the ASD1001 can't be crossed over at 1500Hz. More like 2.5 KHz .
Or did I get it wrong ?
With the APT50 it's 3.5Khz I think !
Would a 2nd order LR crossover work better than a Butterworth 2nd order ?
Maybe go down to 2 Khz or 1.5 Khz with a 4th order LR ?
Or did I get it wrong ?
With the APT50 it's 3.5Khz I think !
Would a 2nd order LR crossover work better than a Butterworth 2nd order ?
Maybe go down to 2 Khz or 1.5 Khz with a 4th order LR ?
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Try any of the quasi-optimal crossover ideas from
http://www.diyaudio.com/forums/mult...sover-high-efficiency-loudspeaker-system.html
http://www.diyaudio.com/forums/mult...sover-high-efficiency-loudspeaker-system.html
I can try that when the time comes. I have the D220Ti. But it did sound a bit sibilant compared to the ASD1001 with the passive crossover ( stock Eminence crossover).
I still haven't found the time to work on my D220ti. Hopefully, I can get something done in February or March. Too many projects in hand. I'm in the midst of a 2.5way tower using 2 units of HiVi M5a. I will continue with the 10cx once I'm satisfied with this tower.
I have a lot of unfinished projects too. But I'll get to the CX10 first ! Wanted to get more done before Dec 31st but have to go out of town this weekend ! Back only in the New Year.
I'm actually in Singapore right now attending to some family matters. This is my second trip in less than 2 months. Will be flying back to US on Dec31. The last time it took like 30 hrs. This time round, about 26hrs.
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