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In Reply to: RE: To Bi or not to Bi, that is the question.. posted by pix on July 02, 2015 at 22:15:12
Do you have an idea of the LF roll-off of the horn? I use the Mini-DSP to make a second order low pass filter to my bass bins while allowing the natural roll-off my Oris 150 horns to make the high pass filter; maybe this could work for you as well?
Follow Ups:
No, so far I haveŽnt made any measurements at the horns.
Perhaps a silly question, but as far as I understand, you let the HF drivers work below the horns acoustical cut off.
CouldŽnt this demage the drivers caused ny to long diagraphm extrusion (caused by no acoustical diagraphm loadig)?
Yes, you need at least a capacitor on the tweeter to cut off bass frequencies. A resistor will pad the tweeter down and then a coil for the woofer. Getting the right values is easy once you pick a crossover point.
Adding a SS amp and DSP could be worse than just using one 300B amp and at 101db, it should be plenty loud enough.
-Rod
Thanks Rod
Is there any calculator tool out there to be used for such a calculation?
Lets say I start of with a 350Hz x-over point (12dB-slope) and a 9dB padding for the weeter
This site has several tools.
http://www.mh-audio.nl/spk_calc.asp
http://www.mh-audio.nl/att.asp
-Rod
The text book approach only works if you have a resistive load.
Most loudspeakers have an impedance that changes with frequency and has capacitive and reactive elements so a crossover program like LSPcad or other will give more accurate results so far as producing the desired response / finding the right values.
Google is your friend. Search words as follows " R-C calculator ".
Kloss, myself, and one other have told you to KISS, throw away a DSP, etc and do a simple passive and run one really GOOD amp on system.
Why 12 dB, 6 dB is phase coherent. Can you run the woofer full range, NO degrading coil on it, and just use a C and padding R on the tweeter Pix?
KISS rules.
Jeff Medwin
Kiss has been my goal so far, so if you think I can get good results with fewer parts IŽm eager to try.
Is your advice to made an acoustical measurement of the bass respectivley topp, and from that design my x-over, or shall i use the transucer datashet data?
Acoustical measurement is not my best of knowledge, but I have a friend whom I think I can get help from.
Pix,
The calculators are on line, many sites offer them. I design primarily by ear, since in the end, what we hear is what counts. You can learn the theory, fine, but its only theory, TRUST what you hear for yourself. In the end result, " how it sounds to " YOU " is ALL that matters " !!
Be happy, have fun.
Jeff Medwin
Not silly at; it was I who was not paying attention. The Oris Horns use a full-range Lowther speaker driver not a compression driver so I don't have the problem you would running a compression driver full-range.
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