Sometimes it's all about QUALITY, when you value SQ. This is a great example of a winner. Good to see you having a small break from RF amplifier rehab!
@@barevids Id do it with a sealed box first. Maybe test it outside of the car out in the open then inside in various orientations. Then port it and show the difference.
There we go! Now we see a 6th order bass reflex! Only difference, is the design backwards, but still worked kinda. A typical 6th order bass reflex is low chamber ported into the high chamber, and the high side ported to the atmosphere.
A true 6th order will have the driver mounted in side the enclosure having the front waves firing into 1 chamber and the rear wave firing into the 2nd chamber in both parallel and series tuned
@@ottobauner9828 There is a such thing a a 6th order bass reflex. Search up counting acoustic orders. Hexibase does a rundown on how to count acoustic orders.
hornresp and virtuixcad can both model them. hornresp is a bit harder to learn, and assumes perfectly rigid materials and no losses from leakage and such. vcad also does this by defualt, but you can add Ql, Qa, and Qp values to make it more accurate to real world.
Built one last year. Series ported box had a hard time with it. But with that being said sounded fantastic. Pretty flat sound not super peaky at tuning. It went very low 25hz and kind of high at about 90hz . My buddy that asked for it loves it. He is running 750 or so watts on dayton Max x subwoofer. Edit for home theater.
@@mustang351c4 yeah about that i used Vituixcad for my 6th order bass reflex with the following parameters Ql 15 Qp 30 Qa 30 But it behaved like there is no leakage at all (just like hornresp simulates it or vituixcad when all parameters are 100). I have no idea why it preforms like this. Maybe i made it too airtight but idk
@@dooflydetailguuy4349 You'd effectively be creating a ported enclosure that acted like a sealed one. For SQL purposes, it could end up alright, but I can't imagine it'd bump anyone off the current db charts.
@@dooflydetailguuy4349 Considering that I've only ever seen a Tesla valve operating while constantly pressurized, that's an interesting question... Honestly, I'd have to believe that theory would be correct.
Speaking of excursion, someone should do a series where they test many subwoofers in free air and see which one sounds the cleanest. Although the cooling system does make some noises depending on the design. A true SQ sub should make absolutely no noise at least at 2” of excursion. JL Audio is pretty good at that as an example.
Have you ever thought about speeding up the test music and then record it in slow motion and slow down the recording of the test music to normal speed?
Love the idea of these compact systems, but there is something I don't understand. What is the purpose of the scaled frequency tests? Why not just use the natural test tones as surely that would more accurately represent real life music use?
im thinking about what would happen if you added a 3rd chamber just like in an Paralell 6th thats tuned 1 octave obove the higher chamber of this box - so when this 2 series chambers unload - you would load the 3rd chamber to improve the higher notes
its like putting a ported box in your car with the window open. So really once you put the duel series ported box in your car and opening the window, it turns into a triple ported box.
It's not the same, that example is like a series tuned 6th order. Applying that logic to this box would be having the driver mounted to the outside of the car, with a ported box on the back of it vented into the car, and then your window open ☺
@barevids can you help me ? i have a taraamps hd 3000 and i use it to run this RCF LF18G401 SUB ( 8 ohm 1800 W ) i wounder if i schuld usw another amp ? the sound was not that great , im now upgrading to a LiFePO4 300Ah 12V and thicker cables and maybe a new amp ?
Set all the knobs on the side to minimum apart from the gain. If still no good then your issue isn't the amp, more likely the box etc. You don't need lithium for this setup. AGM would be fine.
if clipping on kick drum fast notes, LPF is too high. if clipping on long low notes, you have just reached the limits of that amplifier and need a bigger one.
Nope, I didnt design this box but i designed a similar one for a 6 inch DD audio sub and when i did that the graph looked weird i cant fully remember but it wasnt flat at all no matter how i adjusted the design. Only got flat when the 1st box is tuned higher then the 2nd box.
I have a enclosure like this in my room. I made it with a dd 506d2. Its about 30x30x50cm. And it does have port noise at the tuning frequency (25hz). Even at pretty low volumes with about 25 watts. The port is about 3 inches in diameter and its about 30 inches long. Also the software i used (Vituixcad) showed in the graph that it would sound pretty flat but it doesnt really it has a huge bass boost at 25hz (which i fixed by using a 30hz high pass on my amp) I think this is cuz of the ql, qs and qp parameters but i aint sure. I used Ql 15 Qs 30 Qp 30 And it preforms like it has all the parameters set to 100
port velocity and flaring are very important, 3" is pretty damn small, even Logitech (known for port noise and wind) use 4" ports in the Z623 lol you want to keep the port velocity/air speed low by having more port area (as size increases length will too, unfortunately, so your box will increase in size a lot
@@BH4x0r yeah bigger port area is better but i tought it would be enough cuz my driver is only 6 inch and a bigger port really wouldnt fit cuz the port already has 2 90° turns in it and the 2nd chamber size is about 20 liters which isnt small. But hey i learned from it and thats important too
@@BH4x0r vituixcad said that the port velocity would go above 17m/s at like 100 watts so port noise at 25 watts is interesting to me and i could increase the flare on my port cuz the flare is pretty small atm. I also tought it was going to be enough since the port has a way larger surface area than the 8 inch infinity sub that i had that had port noise but i atleast tought it would be less and it is now that i use a highpass filter (through which it still plays lower then the infinity subwoofer so thats nice) eventough the sub isnt perfect its good enough for what i use it for
@@troybakker7628 i would make the whole thing larger tbh, but flaring it might help a bit, 17m/s is like 61km/h port velocity, thats stupid high you could aswell ditch the port entirely and use a 10" PR instead if you don't want a larger enclosure
@@BH4x0r i think i would make one with a pr then but the i might also want a diffrent driver so then ill be 400 bucks lighter so ill stick with this setup for a while.
@@barevids I revised my design and built it, very loud 30-80Hz and gets down to 25 or a maybe 20 depending on what your definition of that is. Lower than 20Hz it makes weird noise
Sometimes it's all about QUALITY, when you value SQ. This is a great example of a winner.
Good to see you having a small break from RF amplifier rehab!
You're welcome Sam
Is series bass reflex similar to 2 girls 1 cup?
With 1 active driver, it most accurately would be similar to 1 girl, and 2 cup's, geez😂🤣😉
@@evilinside5984 ROFL!!
would you be able to do a subwoofer location test with one of the previous box design to see how much it does effect the numbers
Yeah good idea ☺
@@barevids Id do it with a sealed box first. Maybe test it outside of the car out in the open then inside in various orientations. Then port it and show the difference.
Maybe at the end of the "season" you can put each enclosure back in and do a sweep to see which is the loudest at any frequency.
Good idea
Not clear lot of distortion
There we go! Now we see a 6th order bass reflex! Only difference, is the design backwards, but still worked kinda. A typical 6th order bass reflex is low chamber ported into the high chamber, and the high side ported to the atmosphere.
A true 6th order will have the driver mounted in side the enclosure having the front waves firing into 1 chamber and the rear wave firing into the 2nd chamber in both parallel and series tuned
@@ottobauner9828 There is a such thing a a 6th order bass reflex. Search up counting acoustic orders. Hexibase does a rundown on how to count acoustic orders.
Fan of your vids and amp repairing skills. Keep up the good work!!!
A true sound quality box. Unreal.
How many watts is that 6.5" using also lol? You can get some 20 watt 6.5's and some several hundred watt 6.5's
Is this box design scaleable to work with a 10 or 12, even a 15 inch subwoofer?
I would love to know how to design a series ported enclosure ! Nice vids 👍
hornresp and virtuixcad can both model them. hornresp is a bit harder to learn, and assumes perfectly rigid materials and no losses from leakage and such. vcad also does this by defualt, but you can add Ql, Qa, and Qp values to make it more accurate to real world.
@@mustang351c4 thank you ! 👍
Built one last year. Series ported box had a hard time with it. But with that being said sounded fantastic. Pretty flat sound not super peaky at tuning. It went very low 25hz and kind of high at about 90hz . My buddy that asked for it loves it. He is running 750 or so watts on dayton Max x subwoofer. Edit for home theater.
@@mustang351c4 yeah about that i used Vituixcad for my 6th order bass reflex with the following parameters
Ql 15
Qp 30
Qa 30
But it behaved like there is no leakage at all (just like hornresp simulates it or vituixcad when all parameters are 100).
I have no idea why it preforms like this. Maybe i made it too airtight but idk
Hope to see more experimental designs like the fibonacci 4th being the only one that takes advantage of the 3D printers capabilities.
What if the port was the shape of the Tesla valve
@@dooflydetailguuy4349
Good idea! Worth a try or at least a variant based on it.
@@dooflydetailguuy4349
You'd effectively be creating a ported enclosure that acted like a sealed one. For SQL purposes, it could end up alright, but I can't imagine it'd bump anyone off the current db charts.
@@RAW_Reality would it act as sealed for only half the wavelength though.
@@dooflydetailguuy4349 Considering that I've only ever seen a Tesla valve operating while constantly pressurized, that's an interesting question... Honestly, I'd have to believe that theory would be correct.
@8:12... "with the forth being like, yo👋"... lol... Sam your commentary is always real and fun. Love it!
I knew instantly this would be loud but not the loudest enclosure, thing is that does not mean its a bad design at all.
Speaking of excursion, someone should do a series where they test many subwoofers in free air and see which one sounds the cleanest.
Although the cooling system does make some noises depending on the design.
A true SQ sub should make absolutely no noise at least at 2” of excursion. JL Audio is pretty good at that as an example.
152 at 30 hz with a 6.5"?!? Lerd.
142 lol 😂
@@barevids heard wrong but still high!
Phase issues? Box / port noise?
Where can i get some of the plans lmk
Hoping its the "waste of space", everytime you post a new video 🤞🙈
Have you ever thought about speeding up the test music and then record it in slow motion and slow down the recording of the test music to normal speed?
That is exactly what I do 😂
Series tuned 6th next!
" still fu... Friggin loud" 🤣🤣
Its basically a 6th order Bassreflex
The accuracy is horrible, the bass notes were overlapping at times
i agree!
Love the idea of these compact systems, but there is something I don't understand. What is the purpose of the scaled frequency tests? Why not just use the natural test tones as surely that would more accurately represent real life music use?
Watch the pilot and first episode to understand the experiment taking place here.
im thinking about what would happen if you added a 3rd chamber just like in an Paralell 6th thats tuned 1 octave obove the higher chamber of this box - so when this 2 series chambers unload - you would load the 3rd chamber to improve the higher notes
Would be very interesting to see if your smaller cabin space with door closed = louder theory by going true IB.
He should mount that 6.5" sub inverted so we can see that beefy motor lol
I thought the smaller enclosure in the series tuned box is the lower tuned side could be wrong
I love 6,5's, cool to see this being transferred over to Boom or Bust!
Revesre it do first chambers 25 and 2nd 50 hz 6th order series.
That enclosure would be great for an old school Hollywood or Audiobahn sub.
its like putting a ported box in your car with the window open. So really once you put the duel series ported box in your car and opening the window, it turns into a triple ported box.
It's not the same, that example is like a series tuned 6th order. Applying that logic to this box would be having the driver mounted to the outside of the car, with a ported box on the back of it vented into the car, and then your window open ☺
@@barevids Hmmm . . . Im thinking about redesigning the seating position of the driver now . . . Right on the hood . . .
Loving this series of videos. Find it really interesting.
Are you doing the music demo with the music sped up to scale and then slowing down the video afterwards?
yes
@barevids can you help me ? i have a taraamps hd 3000 and i use it to run this RCF LF18G401 SUB ( 8 ohm 1800 W ) i wounder if i schuld usw another amp ? the sound was not that great , im now upgrading to a LiFePO4 300Ah 12V and thicker cables and maybe a new amp ?
Set all the knobs on the side to minimum apart from the gain. If still no good then your issue isn't the amp, more likely the box etc. You don't need lithium for this setup. AGM would be fine.
@@barevids if you ask me they go to clipping to early could this be a problem of the size of the box ? sorry for my bad englisch
if clipping on kick drum fast notes, LPF is too high. if clipping on long low notes, you have just reached the limits of that amplifier and need a bigger one.
@@barevids thanks a lot man
I'm pretty sure it is called a 6th order bass reflex
That's with the woofer mounted between the boxes. In this case the woofer is mounted to outside world like a regular ported box.
@@barevids it yeah it's not a 6th order band pass it's a 6th order bass reflex
ruclips.net/video/41hDRYpZMME/видео.htmlsi=kxeXn3B7_HsGReKo
@barevids there's a great video on counting enclosure orders if u search it on youtube by pete from audiodynamics
Best series on RUclips
good vid
I was thinking the lower tune needed to be first the higher
Nope, I didnt design this box but i designed a similar one for a 6 inch DD audio sub and when i did that the graph looked weird i cant fully remember but it wasnt flat at all no matter how i adjusted the design. Only got flat when the 1st box is tuned higher then the 2nd box.
@@troybakker7628 maybe im thinking bandpass 6th or somthing like that
I have a enclosure like this in my room. I made it with a dd 506d2. Its about 30x30x50cm. And it does have port noise at the tuning frequency (25hz). Even at pretty low volumes with about 25 watts. The port is about 3 inches in diameter and its about 30 inches long.
Also the software i used (Vituixcad) showed in the graph that it would sound pretty flat but it doesnt really it has a huge bass boost at 25hz (which i fixed by using a 30hz high pass on my amp)
I think this is cuz of the ql, qs and qp parameters but i aint sure.
I used
Ql 15
Qs 30
Qp 30
And it preforms like it has all the parameters set to 100
port velocity and flaring are very important, 3" is pretty damn small, even Logitech (known for port noise and wind) use 4" ports in the Z623 lol
you want to keep the port velocity/air speed low by having more port area (as size increases length will too, unfortunately, so your box will increase in size a lot
@@BH4x0r yeah bigger port area is better but i tought it would be enough cuz my driver is only 6 inch and a bigger port really wouldnt fit cuz the port already has 2 90° turns in it and the 2nd chamber size is about 20 liters which isnt small. But hey i learned from it and thats important too
@@BH4x0r vituixcad said that the port velocity would go above 17m/s at like 100 watts so port noise at 25 watts is interesting to me and i could increase the flare on my port cuz the flare is pretty small atm.
I also tought it was going to be enough since the port has a way larger surface area than the 8 inch infinity sub that i had that had port noise but i atleast tought it would be less and it is now that i use a highpass filter (through which it still plays lower then the infinity subwoofer so thats nice) eventough the sub isnt perfect its good enough for what i use it for
@@troybakker7628 i would make the whole thing larger tbh, but flaring it might help a bit, 17m/s is like 61km/h port velocity, thats stupid high
you could aswell ditch the port entirely and use a 10" PR instead if you don't want a larger enclosure
@@BH4x0r i think i would make one with a pr then but the i might also want a diffrent driver so then ill be 400 bucks lighter so ill stick with this setup for a while.
@barevids I heard there was a paraflex design submitted? I hope its comin up soon :D
There was but it doesn't look right :/ I want like a golden Formula or something
@@barevids Fibonacci wub wub box lmao
@@barevids I revised my design and built it, very loud 30-80Hz and gets down to 25 or a maybe 20 depending on what your definition of that is. Lower than 20Hz it makes weird noise