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Old 20th May 2012, 01:04 PM   #4091
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enhed ts i kasse.bmp
Quote:
Originally Posted by pieter t View Post
Could you explain how your "low Q system" is specified (value of system Q; -3dB LF bandwidth)?
Sorry I do not have that anymore. Here is ts for my midrange. Maybe you can imagine how my bass works then.
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Old 20th May 2012, 01:09 PM   #4092
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Quote:
Originally Posted by Erlend Sæterdal View Post
Attachment 283300

Sorry I do not have that anymore. Here is ts for my midrange. Maybe you can imagine how my bass works then.
No I can't; midrange is a bit different from bass
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Old 20th May 2012, 01:14 PM   #4093
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Quote:
Originally Posted by Juhleren View Post
My humble guess is that the low out put impedance was implied to maintain a low Q for the system.

It could sound like that you have gone to great lengths to get a low Q on the speaker side of things -only to depend on having some output resistance on the amplifier end. Nothing wrong with that, but a 0,03R coil sounds like an expensive solution if you really don´t want a total system Q that is as low as it provides.

What kind of woofers and enclosure do you have and whats the rest of the filter on the bass section, if I may ask?
I got those coils because of my amplifiers at that time. Earlier it was a DCA cast with 0,5 ohm . That was no good match for my non feedback The End XP . Now I have those coils and with my new amp it is just perfect. What difference do the rest of my filter make in this combination ? It is a 18 db acoustic filter and 12 db eletric. The enclosure is aprox 140 l.

This is to much about my speakers in this tread . Nothing more about them.
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Old 20th May 2012, 01:17 PM   #4094
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Quote:
Originally Posted by pieter t View Post
No I can't; midrange is a bit different from bass
Yes but not much in this case !
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Old 20th May 2012, 01:27 PM   #4095
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Quote:
Originally Posted by Erlend Sæterdal View Post
This is to much about my speakers in this tread . Nothing more about them.
Agree; it does not make any sense to discuss the loudspeaker - amplifier interface when you don't know the actual performance
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Old 20th May 2012, 01:39 PM   #4096
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If you knew a little about it is enough I think .
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Old 20th May 2012, 01:43 PM   #4097
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Quote:
Originally Posted by Juhleren View Post
Wouldn´t that depend on the reactance of the coil, hence its inductance as you probably know...

If you imply to simply collate what make up the total impedance in terms of assessing the theoretical damping factor of the system (in relation to frequencies), then my guess is that something important is left out.

Have you tried various coils and resistors and heard their effects on a (bass) system?

cheers,
My point exactly. A 3.3 mH coil will have 1 ohm impedance at 50 Hz. Thus the driver will "see" a 1 ohm shunt impedance at 50 Hz.

I haven't crossed over sub's/woofers with a passive network since the 80's, so I really can't comment on your last question.
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Old 20th May 2012, 02:00 PM   #4098
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Quote:
Originally Posted by Erlend Sæterdal View Post
Seems like you have never listened to a low Q system.
How low a Q is it and why would the ncore not be suitable to drive it ?
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Old 20th May 2012, 02:07 PM   #4099
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Originally Posted by Trevor White View Post
How low a Q is it and why would the ncore not be suitable to drive it ?
He said he doesn't know, so I don't get the point either
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Old 20th May 2012, 10:39 PM   #4100
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Quote:
Originally Posted by Trevor White View Post
How low a Q is it and why would the ncore not be suitable to drive it ?
Q is around 0, 28 . Low Q is very tight bass.
Combination with the very tight bass from N Core results in almost no bass .
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