Hey, so I'm working on a potential 2.5 way speaker enclosure. I'm planning on using some Dayton 6.5"s as my mids and their specs look perfect...they actually get pretty low (just not sub slow) and I would really like them to stay as clean as possible and not distort at super low frequencies since I'll also have an 8" sub doing that work.
The cabinet size Dayton (Parts Express) recommends is a sealed enclosure with an F3 of 77Hz, which is basically perfect for what I want. My question is: if I don't put a high pass filter in front of the speaker is there a potential it'll start distorting at high volume/super low frequency situations? Basically, what would happen if the amp sends 20-40 Hz at it? Is it just subtly rolled off? Does the speaker still struggle? I'm hoping the size of the cabinet will more or less "limit" the speaker from trying to hit those notes, but that might be too good to be true.
Please let me know your thoughts, thanks!
The cabinet size Dayton (Parts Express) recommends is a sealed enclosure with an F3 of 77Hz, which is basically perfect for what I want. My question is: if I don't put a high pass filter in front of the speaker is there a potential it'll start distorting at high volume/super low frequency situations? Basically, what would happen if the amp sends 20-40 Hz at it? Is it just subtly rolled off? Does the speaker still struggle? I'm hoping the size of the cabinet will more or less "limit" the speaker from trying to hit those notes, but that might be too good to be true.
Please let me know your thoughts, thanks!
The small box will act a bit like a spring and keep cone excursion in check, but maybe not as much as you'd like. You can run the speaker and box in a simulator to see how things behave down below 77 Hz.
Don't forget that the mid impedance will be paralleled with the woofer all the way down, if that's important to your design or your amps.
Don't forget that the mid impedance will be paralleled with the woofer all the way down, if that's important to your design or your amps.
Unfortunately I don't have a simulator!
Oh, and so if the 6.5" has an impedance peak at ~50 Hz that would negatively effect the sub then, right? I actually hadn't considered that.
Oh, and so if the 6.5" has an impedance peak at ~50 Hz that would negatively effect the sub then, right? I actually hadn't considered that.
The peak won't be the problem -- the lowest parts of the impedance will be the issue. For example, below that peak the midrange will be sucking current from the amp along with the woofer, but not giving output for the loading it causes; if both drivers were 4 ohms, you now have a 2 ohm nominal speaker and a lot of amps wouldn't like that. Might even heat the voice coil of the midrange if you're playing dubstep or stuff like that.
This is the problem, and not just with dubstep. Any bass to the midrange will restrict cone and voice coil movement below the mid's cabinet resonance, so the mid will look more like the DC resistance of the voice coil, and really heat up.
Yes, you can use the small midrange's cabinet as PART OF the crossover to give a greater slope between the mid and bass, but the mid really needs an electrical high-pass at the bottom of the desired midrange response, to keep high levels of bass out of the mid. This will save the speaker system from giving such a low impedance in the bass as previously mentioned, but I think it's an even bigger problem of putting too much power into the midrange driver and burning it out.
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