Ok.. In a few weeks' time, i'll start work on my most ample project to date: 5 (five) bi-amped, 2-way cabinets, with a 35/50W mid-woofer and a silk dome tweeter. Now, the mid has an SPL of 82dB @1W/1m, while the tweeters are around 90-92 dB.
My question is: How can i (measure, if needed and somehow) equalize the sensitivities of the speakers??? (i.e. reduce the tweeter from 90-92 to 82 dB, to match the mid-woofer)
Note that i intend to use a 4th order Linkwitz-Riley crossover before the power amps for each cabinet, and the output buffers have a level control for each frequency band (mid and high, respectively).
My question is: How can i (measure, if needed and somehow) equalize the sensitivities of the speakers??? (i.e. reduce the tweeter from 90-92 to 82 dB, to match the mid-woofer)
Note that i intend to use a 4th order Linkwitz-Riley crossover before the power amps for each cabinet, and the output buffers have a level control for each frequency band (mid and high, respectively).
You can do that with a L-pad.
You could also use several mid-woofers to need less EQ,
If you use 4 mid-woofers per tweeter, you'll have 88 dB versus 90-92 dB tweeter.
82 dB is really poor efficiency, I hope that mid-woofer is worth it...
You could also use several mid-woofers to need less EQ,
If you use 4 mid-woofers per tweeter, you'll have 88 dB versus 90-92 dB tweeter.
82 dB is really poor efficiency, I hope that mid-woofer is worth it...
Well, i don't want to build anything like a PA system, so 4 woofers per tweeter is out 🙄
The thing is that i wanna come out pretty cheap, so i'm gonna be forced to do some compromises. This mid-woofer is something like 7$ so... 🙂
Umm.. getting back on topic, know any links to something related to L-pads?
http://sound.westhost.com/project09.htm
Or better yet, some data about the relationship between the output buffer 's pot's travel and the actual SPL (if there is a remotely linear relationship...)
The thing is that i wanna come out pretty cheap, so i'm gonna be forced to do some compromises. This mid-woofer is something like 7$ so... 🙂
Umm.. getting back on topic, know any links to something related to L-pads?
http://sound.westhost.com/project09.htm
Or better yet, some data about the relationship between the output buffer 's pot's travel and the actual SPL (if there is a remotely linear relationship...)
If you cross over actively you don't need the same sensitivity. Just turn down the level on the tweeters.
I KNOW THAT THAT IS ALL I HAVE TO DO!!! I just want to find out (as objectively as possible) just HOW MUCH to turn down the tweeter level. Subjectivity isn't good enough for me 🙂
Yeah, thanx carlosfm, i figured that much by myself.. 🙂
Damn.. When i ask questions, i ask questions 😀
Damn.. When i ask questions, i ask questions 😀
Measure, adjust the appropriate pot, measure again, etc. This also lets you compensate for variation between units somewhat. Of course measuring will open up a whole new can of worms about the crossover, but you can cross that bridge when you get to it.
See my webpage for some info on a cheap measuring setup.
See my webpage for some info on a cheap measuring setup.
You might be astounded how accurate this works sometimes !!!!
OTOH you can use a soundcard-based measurement program and a simple measurement mic to do so.
Regards
Charles
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