I always find thinking to extremes very useful in any engineering situation, and imagining a 4" driver having sufficient excursion to match the displacement volume of a Powersoft M-Force motor with a 40" cone (Vd = 14.5l) says to me that one is very likely going to sound better than the other...
High pass filter! If we make statement that excursion defines quality of bass here is advice for everyone: use high pass filter because without one the woofer could have huge excursion for very low frequencies without audible output, which according to the statement equals poor bass quality.
Active systems, tube amps with output transformers, perhaps some hifi amplifiers or closed enclosures could have some high pass factored in to reduce unnecessary excursion.
How about yours, is your system high passed to prevent bad bass? If you have ported enclosure passive speaker with class-D amp from box store its high possibility there is no high pass filter and you are enjoying bad bass!
Active systems, tube amps with output transformers, perhaps some hifi amplifiers or closed enclosures could have some high pass factored in to reduce unnecessary excursion.
How about yours, is your system high passed to prevent bad bass? If you have ported enclosure passive speaker with class-D amp from box store its high possibility there is no high pass filter and you are enjoying bad bass!
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As Audiofrenzy says, i have to adding enough woofers to meet my high listening SPL levels.
And that´s why i end up with 6 of the Peerlees xxls 830847, 12 inch 12,5 xmax woofers ported, 4 of them was not enough in my room.
wchang, Do you mean inductor parallel to woofer? that would short amplifier outputs on the low frequencies and perhaps damage the amplifier. How about big series capacitor, everyone likes capacitors in signal path? Or sealed enclosure to limit excursion, or high pass before amplifier with DSP? perhaps music you like doesn't contain very low frequencies so its not an issue, no solutions needed for non problem.
Its a system level problem, in a way, if there is DSP or not could affect many other system design decisions as well. One could block a reflex speaker port with pillow and so on. Best bass ever heard probably had all sorts of things well aligned, a system well done and tuned.
Or sealed enclosure to limit excursion, or high pass before amplifier with DSP? perhaps music you like doesn't contain very low frequencies so its not an issue, no solutions needed for non problem.Its a system level problem, in a way, if there is DSP or not could affect many other system design decisions as well. One could block a reflex speaker port with pillow and so on. Best bass ever heard probably had all sorts of things well aligned, a system well done and tuned.
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Every music contains very low frequencies... at some level.
My subs (servo controlled, closed) in my room play from 15Hz (not very loud, not home cinema SPLs, but ok for 99% music), and for all music I choose not to use HP filter, it gives more realistic and present sound (not ABX tested))) But I use HP for my dipoles at 35, and it sounds better. Subs and dipoles work together below 100Hz.
Best bass I ever hear also was with multi subs with servo with superb time alignment and low GD.
the best bass I have heard sounds big only like a big woofer can sound like, but also as fast as the mids. seemingly not losing a milisecond of "timing"
once you have both the power of a 15s and ultimate speed, the idea to get better bass is not existent for me.
once you reach hifi quality bass, time to move on and enjoy music.
once you have both the power of a 15s and ultimate speed, the idea to get better bass is not existent for me.
once you reach hifi quality bass, time to move on and enjoy music.
What music containing low frequencies do you listen to? And how loud?
I would like to recommend "Ruins" by Fred Dupré to all lovers of guitar music. https://dunerider.bandcamp.com/album/ruins
Olegterm, servo subs so you have probably closed enclosures? Closed boxes limit excursion so it makes sense to highpass or not, whichever sounds better.
Reflex boxes below tuning lose output fast while excursion skyrockets as the air inside box doesn't resist excursion. Same for dipoles, output cancels out while excursion goes up, as frequency goes down, must high pass.
Reflex boxes below tuning lose output fast while excursion skyrockets as the air inside box doesn't resist excursion. Same for dipoles, output cancels out while excursion goes up, as frequency goes down, must high pass.
I understand you! Mine are volume limited too.
https://www.diyaudio.com/community/...ass-array-with-low-q-subs.392998/post-7195562
They are close-box, but in case of servo only X-max or amp power limit excursion - because of servo control. In my case amps began to distort, happily as I say for 99% of music at my SPLs its not a problem
Yep, I know. I am not a fan of reflex boxes. But in this case HP filter is a good idea of course.
Thanks for the reply. I did mean inductor with resistor, out of direct signal path, so don't have to be hugely $. Monster cap in series surely changes the sound no?wchang, Do you mean inductor parallel to woofer? that would short amplifier outputs on the low frequencies and perhaps damage the amplifier. How about big series capacitor, everyone likes capacitors in signal path?
Its a system level problem, in a way, if there is DSP or not could affect many other system design decisions as well. One could block a reflex speaker port with pillow and so on. Best bass ever heard probably had all sorts of things well aligned, a system well done and tuned.
I hoarded some crosscaps during a sale but never thought to try them on my smallish bass or fullrange drivers.
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If they weren't lying, they came by themselves when they heard the music ("Ruins" by Fred Dupré) at a distance of about 250 meters.
Yeah, series resistance with woofers are also avoided usually, due to (possibly) high power and consequent heating and of course some loss on sensitivity, woofers don't usually never have enough output
Cap in series would possibly make high impedance for the driver back-EMF as well, which is electronic damping for the driver resonance. Losing this damping makes bump in response unless the damping is done with the enclosure, or with some parallel (to woofer) circuit to notch the peak out, expensive big parts. So not a good solution either. This might work fine if you have too small of a box and need some bass boost though bit its another purpose
I cannot say how much a capacitor would affect sound other than through the impedance, change in frequency response.
