Hello there, i have the same unit x300a and im trying to do the same approach of making used of these speakers.
I bought Q100 crossovers from ebay, now the question is that the crossover is rated for 8 ohms and the uniq driver of x300a is 4ohms. Will it work just fine? or it will burn the voice coil overtime?
I bought Q100 crossovers from ebay, now the question is that the crossover is rated for 8 ohms and the uniq driver of x300a is 4ohms. Will it work just fine? or it will burn the voice coil overtime?
During the course of this thread, I established that the Q100 passive crossovers match the drivers in the active X300A.
The ebay statement that the crossover is rated for 8 ohms may be taken with a pinch of salt.
I would be confident in using the Q100 crossover.
Please report back, I'd be interested in knowing how the modification sounds - the OP certainly said his cloned Q100 crossovers worked.
The ebay statement that the crossover is rated for 8 ohms may be taken with a pinch of salt.
I would be confident in using the Q100 crossover.
Please report back, I'd be interested in knowing how the modification sounds - the OP certainly said his cloned Q100 crossovers worked.
Since it's your first post, vrachie, I'll add that 8 ohm is simply a nominal figure since the impedance of the Q100 speaker system varies widely with frequency.
Look at the Q100's impedance versus frequency curve (red trace) in the attachment. Within the audible range, the impedance drops as low as 4 ohm in some places, but for most of the time it is well above 4 ohm. In fact at the crossover frequency of 2,500 Hz the impedance is 30 ohm.
The 8 ohm rating of the Q100 speaker system and crossover is therefore only a nominal figure. The crossover design takes the changing impedances of the drivers into account.
Look at the Q100's impedance versus frequency curve (red trace) in the attachment. Within the audible range, the impedance drops as low as 4 ohm in some places, but for most of the time it is well above 4 ohm. In fact at the crossover frequency of 2,500 Hz the impedance is 30 ohm.
The 8 ohm rating of the Q100 speaker system and crossover is therefore only a nominal figure. The crossover design takes the changing impedances of the drivers into account.
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hi galu thanks for the breif explaination.
finally I'm done installing q100 crossover into x300a and its sounds amazing, even better from the build inpower amp dac of x300a itself.
I even tried other crossover which I bought from amazon but I think it was lacking the right frequency range (just based on what im hearing when I compared it side by side with the q100 crossover).
Well this settles it, Im very thankful I found this thread and learn a lot more from you guys. Thanks a lot.
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I have just converted my X300A as well. Are you looking for this?
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Ouch!!!!Nice, it worked!
Now I need to get different MDF or so, OSB looks ugly when cutting the holes.
Thank you very much guys, I really appreciate your help with this project! Learned a lot
OSB is strong and water resistant but UGLY!!!
I bought some to make guitar speaker cabinets and it was unusable: edges splinter too much, sharp splinters are literally hard as nails (they are impregnated with some HARD resin) and hard to sand down, really not worth it.
And rough irregular surface shows through Tolex covering ... ugh!!!
I had to dispose of it by making shelves, go figure.
Since the thread has been re-opened, I shall state that its original purpose was to convert the active KEF x300a loudspeaker to passive use.
The solution is to use the KEF Q100 crossover circuit, a photograph and schematic of which are attached.
The solution is to use the KEF Q100 crossover circuit, a photograph and schematic of which are attached.
