Z min. for a 4 Ohm speaker is 3.2 Ohms. Who here in speakerdudeland would make a speaker with a Z Min. of 2 Ohms. I’m brain farting a multiple woofer idea with high sensitivity. A 3 or 3 1/2 way where the woofers will carry the baffle step, small fast woofers. 6.5 inch. I know they say power is cheap and my Fosi Z3 sounds better than my Emotiva TA-1.,but I don’t like to spend money on equipment, and speakers are not equipment. They are more like art or a fixture. So I have no problems powering an expensive pair of speakers with a cheap class D amp. I have four Wavecor SW-182-4 that I bought a few years ago and have been sitting on my shelf for a dual opposed subwoofer project that my never happen. They are 84 Db with a Z Min. of 3.5 if I used two per cab in parallel I would end up with a 2 ohm Z min after some inductor DCR added. I think?
I know how shy you guys are about sharing your opinions but a really would appreciate it.
I think they need a separate amp.
depends, some amps have no problem handiling like like the crown xls, other amps may end up croaking - worse case scenario - you not only end up frying your amp, but it clips and burps your drivers too. Do you have a amp that can handle 2 ohms - emprically, quite a amps can do it, but are not advertized as such.
Whats wrong with 80db after BSC at 8 ohms serial?
BTW I have taken my drivers to 2 ohm min, but i was using active setup and the amp was rated to 2 ohms asymmetrical - SOME Icepower amps can do asymmetrical loads.
I guess its my conservative nature that has a hard time attenuating 12 Db. or more off a mid and tweeter.
keep the subs on the floor and raise the mid/tweet off the gound. You may get away with hardly any BSC. Average 90 db mid will be down to 84 db after 6 db BSC, maybe a couple db of attenuation?
But now the mid carries the BSC.
12 db attenuation doesn’t hard the mid/tweet or the sound. How are you planning to use 2 amps? Biamp - possible if you do a 3.5 way for 4 ohm 84 Db. No need to apply BSC as the second woofer 0.5 will make up for the BSc.
I keep meaning to do a build with three 8ohm drivers per side because I know the arc welder (Dreadnaught) will drive them fine. I say do it and see.
You do it first my Irish buddy
I do believe in boundary reinforcement but the wavelengths are so large, I cant imagine more than a decibel or two.
So maybe a hybrid speaker where the mid will not be high passed but excursion controlled as best as possible and a powered sub or two or four in the same cabinet.
Traditional binding posts and a cord that plugs in the wall.
FYI…The Fosi V3 mono blocks and the 3eaudio A7 mono blocks are both Class D amps with PFFB rated down to 2-ohms. I’m thinking of using the Epique180HE-44 with the voice coils wired in parallel but think the z-min may still be a bit higher than 2.0.
I think its time to push some current. I love me some big fat speaker wires.
I have some plans to do this eventually, maybe.
I have never designed or built a speaker project where I was overly concerned about the speaker’s impedance. I have built some 3 ways with pretty low impedances. Not one single amp or receiver of mine has ever had an issue. That said I don’t design speakers hoping that they become “kits” on PE and I don’t own any Iawa or such garbage receivers.
Pretty low is what? Come on buddy, give us a number. Sorry I mean no offence.
To also note, in my project experience, when the imoedance drops low, like 3.5 ohms, the phase angle there is almost always at or very close to zero degrees. The higher phase angles happen where the impedance is quite high.
So it is an easier load, less reactive. makes sense.
I did a 3 way with two 8 ohm woofers in parallel, and a 4 ohm mid, and a 4 ohm tweeter. Impedance dropped to a low of 2.5 ohms. Zero issues listening at pretty loud levels for extended periods.
I still don’t want to be the guy who shuts down a speaker event.