I have four speakers I will be using in a boombox build, 2 x 30W rms (4 ohm) and 2 x 10W rms (6 ohm). Would I be able to drive these using a 2 x 50W rms amp and a 2 x 15W amp?
Also I have a 24V 5A PSU, would this be ok to power this all?
Thanks
Also I have a 24V 5A PSU, would this be ok to power this all?
Thanks
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What are the voltage sensitivities of the drivers?
power ratings are probably worth ignoring, i.e. useless for any design input.
What are the Power Amplifiers gains?
What are you using to split up the frequency range to suit the different drivers?
power ratings are probably worth ignoring, i.e. useless for any design input.
What are the Power Amplifiers gains?
What are you using to split up the frequency range to suit the different drivers?
The sensitivity of the bass speakers is 90 dB and for the tweeters it is 89 dB (Monacor SP-60/4 and Dayton ND16FA-6).
The amplifiers are based on the TPA3116 and the TA2024 which I purchased from ebay pre-assembled. How can I check the gains of these?
I will design a crossover for the system with a crossover frequency around 4 khz. It does not look to hard to design/build after reading this thread:
http://www.diyaudio.com/forums/mult...designing-crossovers-without-measurement.html
Could you tell me why the power ratings for the drivers are worth ignoring? I would of thought it was quite important in the design.
So you have 2x50w and 2x15w amps, are you doing an active crossover? Whether you go with active or passive crossovers, I think the separate amps (bi-amped) will be needed as you'll have a sensitivity difference.
Those sensitivity figures you've quoted are @ 1w/1m, the 4ohm driver will get more power (and it's already more sensitive), and it's not as easy to attenuate a woofer - so dealing with the difference at line-level will be best.
Those sensitivity figures you've quoted are @ 1w/1m, the 4ohm driver will get more power (and it's already more sensitive), and it's not as easy to attenuate a woofer - so dealing with the difference at line-level will be best.
I think I will go for an active crossover with a bi-amp setup. I have found a PCB crossover on eBay from kmtech. I would just need to tweak the values to adjust the crossover frequency for my setup. Here is the circuit diagram of the crossover:
http://i.ebayimg.com/00/s/OTQwWDgwMA==/z/fJ4AAOSwEK9Ty20s/$_57.JPG
Would this work?
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I am a bit confused with the design of the active crossover. Am I correct in thinking that with an active crossover it does not matter what the sensitivity of the drivers are?
Sensitivity still matters. Since the more sensitive the more efficent the complete system will be.
What does not matter is matching the sensitivity or woofer and tweeter, which is one of many things that is critical in getting a crossover to sound right. This issue can simply be solved by putting volume controls between the cross over and the amplifer.
Even so adjusting the volume of woofer Vs Tweeter is a suprisingly hard thing to do by ear with a simple volume control, but you might be suprised how good you can get if you are lucky enough to measure it later.
24V*5A=120 watts if all is perfect. You have 130W of amplification. So…probably fine, unless you crank it, and then likely not in real life with real amplifier circuits and a real power supply.
As a loudspeaker engineer I'll say speaker power ratings are pretty much useless. Basically, the more amp power the better, until it sounds bad --> then TURN IT DOWN and you'll be fine.
Yes, do a crossover before the power amps, with level control.
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