I believe that the primary advantage of a 4-way over a 3-way is that it allows the designer to limit the bandwidth of each driver. Removing the deep bass content from the 8" woofer bandwidth allows it to play the 100 -500 Hz region (mid-bass and upper bass) more cleanly and with less distortion. If we let it roll off naturally, and then augment the deep bass with a sub, we have not increased the dynamic range of the 8" woofer, nor have we lowered its distortion. I believe the best way to implement a subwoofer is to highpass filter the signal to the main speakers.
If a pair of subs are used, the crossover frequency from sub to main can be higher, as long as the sub is kept within 1/4 wavelength distance from the main speakers.
There is nothing special about 100 Hz as far as I know.
what you see here between 100hz and 300 hz is due to your room acoustic.
what were the distance between the speakers and the mic?
what are your room treatment, if any?
do you have measurements of the speakers measured 1M away in a treated environment or outside garden or anechoic?
all true, i agree. i thought i remembered a no xo zone being around 100hz due to possible floor- bounce?
OP's xo points is 125hz and 4khz
the mid do not struggle to reach 125hz...
I feel like the complexity of adding the 8'' will worsen the SQ
since i never go past 100 db, indeed my use of the audax is wonderful. i understand if you need much louder the 325hz xo might not work... or it might! isnt there report of dudes playing that driver without filters up to 100db? ill make distortion measurements of my system. kinda curious up to how loud i can play them before the mid starts crapping out. I suspect around 110db
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I use Omnimic for typical quick measurements, but prefer Clio if I have the time to fuss with it, as it is a bit more accurate.
Once the IMD shows up, its much more audible than predominately even order HD alone down in that area. Some even order HD is pleasant sounding to an extent. That audax mid gets much of its character from wide band cone breakup, which makes it sound the way it does.
Usually a few percent even order HD isn't remotely an issue, but once IMD pops up sharply with a very excursion limited driver, odd order HD takes off like a rocket and sounds really bad. The driver i use for lower efficiency speakers is the Peerless NE180W, which handles a lower crossover point well as a dedicated mid woofer. I also like some of the SB acoustics drivers. One of the highest resolving mid bass drivers to my ears is the Audax HM210C0. Its a very dynamic and open driver that can seamlessly bridge the gap between a large woofer and smaller midrange.
Once the IMD shows up, its much more audible than predominately even order HD alone down in that area. Some even order HD is pleasant sounding to an extent. That audax mid gets much of its character from wide band cone breakup, which makes it sound the way it does.
Usually a few percent even order HD isn't remotely an issue, but once IMD pops up sharply with a very excursion limited driver, odd order HD takes off like a rocket and sounds really bad. The driver i use for lower efficiency speakers is the Peerless NE180W, which handles a lower crossover point well as a dedicated mid woofer. I also like some of the SB acoustics drivers. One of the highest resolving mid bass drivers to my ears is the Audax HM210C0. Its a very dynamic and open driver that can seamlessly bridge the gap between a large woofer and smaller midrange.
You feel pretty strongly about this mid lol. It does “hit” 125, but there is no hit, thump, power behind it. It’s already playing up to 4K and when I added a dedicated mid bass the whole thing just came together.
I did not base my XO on the room measurements, I based it off of a mixture of listening for the cadence of the drivers around the crossover points and managing the power to the drivers, it’s pretty easy with a dsp!
in terms of the 8 messing up the SQ it’s false, it really pulled it together very nicely. I did try to make it work with this 4” but in reality these Dayton Reference line speakers while nice aren’t their stated size, this is 2.8 inches across from the inside of the surround, that is the likely culprit here to be honest. So maybe if I had a 6 with a good sound I would have been ok but this mid sounds sweet so I’m staying with it for this one.
Hmm i think it depends. Wolf von langa speaker, 2 way, matches 12 inch woofer with AMT tweeter and had great reception at recent Munich show. See review: https://www.hifi-advice.com/blog/re...dspeakers-passive-reviews/wolf-von-langa-son/
As far as i remember Xo was 600Hz!
The thing is, they make this driver in house, alnico with silk cone.
Next example is OMA Ironic open baffle. This model matches 15 inch woofer, field coil with tall ribbon. Where its crossed? I have no idea , but must be somewhere around 500-1000Hz. So this requires superb drivers, obviously.
There are of course exceptions to the rule if the driver is a custom bespoke design, allowing the rules to be bent a little. I've seen unicorn type drivers that are the extreme in design, which can work in situations a typical off the shelf driver can't. The ATC 3" dome is such a driver, having a magnet asy the size of a large prosound midbass and playing lower than some 5" cone dedicated mid drivers can.
https://wolfvonlanga.com/
https://oswaldsmillaudio.com/ironic
Well well, These showcases don't present anything that I would concider hifi in sense of high performace and sound quality. Modern science-based loudspeaker design aiming towards controlled dispersion and low distortion even at high spl doesn't encourage to 2-way designs, even with astronomical price and exotic materials...
https://oswaldsmillaudio.com/ironic
Well well, These showcases don't present anything that I would concider hifi in sense of high performace and sound quality. Modern science-based loudspeaker design aiming towards controlled dispersion and low distortion even at high spl doesn't encourage to 2-way designs, even with astronomical price and exotic materials...