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| Crossover frequency of a 2.1 speaker system |
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| poot36:
That may work but the active and passive crossovers have volume and bass volume controls on them so I think that I could find a way to get the volume problem solved. The model number on the Kenwood is ka-3500 and yes it has one volume dial. I do not really want to use the low quality headphone output on the 3d monitor if I can help it (that is the only audio out it has). I hope to someday place the Curtis speakers under the top section of the left and right sides on the desk so that they are off the floor (my bed is right behind all of this setup so I think that it would help prevent it from soaking up some of the sound). |
| LektroiD:
Why would you need to alter the crossover frequency? This does not seem like a feasible move to me... The frequency the sub crosses over at should be the lowest frequency your satellite bass drivers can go to in the real world, otherwise you will be left with a frequency gap. The only time you would need to lower the crossover frequency of your is if you use larger satellites with a lower base frequency. Chances are, if that was bought as a system, it was designed to work with the satellites it came with, and the set frequency is matched for the whole system. Looking at the photo, the satellites don't look like they would be capable of going as down to 100Hz in the real world (not just on paper) - many speakers claim to have a bottom frequency of 60Hz, but in reality a 6" cone could not physically move enough air in the room to be heard from any distance, which is where the sub comes in. If it sounds wrong in your room, and you are getting boosted or dropped frequencies, then look at the modes of your room, and speaker placement (there are many online room mode calculators available online for free), you need to read up on room acoustics and look at speaker placement, rather than changing frequencies set at the factory which were matched for that system as a whole. Chances are it's standing waves and the resonant frequency of your room which is more the problem than the actual speakers, which could better be solved with a few bass traps in the corners and a reflection free zone (RFZ) opposite your satellites.. I have set up a number of recording studios over the years, both commercially as well as repairing faults in existing setups. The amount of times I've gone into a home studio where the owner has spent thousands going through several speakers and getting the same results with boosted frequencies by placing them direct onto their computer desk causing early reflections from the desk itself. This isn't limited to recording environments, basically anywhere you have a speaker system. Read more about acoustics, and understand what might be causing your frequency issue here: http://www.indiana.edu/~emusic/acoustics/reverb.htm |
| poot36:
I do not want to change the crossover frequency juts the output voltage. The problem is that the output voltage changes based on the input frequency. The lower the input frequency the higher the output voltage upto almost twice the input voltage. How would I change the circuit to keep the current crossover frequency but have the output voltage stay the same regardless of the input frequency? That is the only major problem I have right now with implementing this idea. I do not think that a proper sub crossover has its output voltage change with frequency. I think that this was done on these Benwin speakers because of the small (3" !) "sub" to try and make up for the undersized speaker. |
| poot36:
Well I think I may have answered my own questions. I have changed R19 to 330K, R21, R22 to 100K, and C19 to 0.22uF and now the crossover frequency is around 68Hz and it does not appear to change in voltage any more through out its frequency range. I am mostly happy with it but I am wondering why it won't pass a square wave? It turns the square wave in to a sign wave on the output. I have upgraded the op-amp to a lm833 with a faster slue rate 5V/us vs 1V/us and it may have made the square wave to sine wave conversion issue more pronounced. What is going on here? |
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