Calypso, you've got an interesting cone and pipe color matching! How does it sound? You can easily change it into a BR by adding a plate for the base and insert a port. 🙂
GM, thanks for your reply, you're a reference. looks like the tqwt is becoming a total futile upgrade. i was thinking at it for a bass enhancement, but it seems that the dimension i've chosen do not permit the quarter wavelength trick.
can someone suggest me a good way to measure results, to share them with the forum?
i almost finished the big part of this! i upload some pics of the pipe speakers, and of the amp casing.
notice: orange line shall represent the speaker i've chosen to built, 52.5 cm long. other colours are for taller pipes
my pc feeds a box mounted fm/mp3 player with aux support, that passes aux input to two ta2020 amps. in this case only an amp is running with two speakers
here is the amp box. connection only one side, the simplest as possible. on the borders rca for speakers, 4 output out of 2 amps. in the middle 3,5 stereo input and power input
here is the amp box - upper side is for power: general on/off switch, and voltmeter activated via tactile switch.
in the middle are amps leds (arjen provides them for free! thanks man) for power & overload, and volume pot for amps
on the lower side the mp3/fm/aux unit (with remote)
i can open the plastic casing to check volts, and manage volume and player, difficult to notice, but a usb key is plugged and giving mp3 to player
if i put speakers sitted on the floor, they have a smoother response!
can someone suggest me a good way to measure results, to share them with the forum?
i almost finished the big part of this! i upload some pics of the pipe speakers, and of the amp casing.
An externally hosted image should be here but it was not working when we last tested it.
notice: orange line shall represent the speaker i've chosen to built, 52.5 cm long. other colours are for taller pipes
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
my pc feeds a box mounted fm/mp3 player with aux support, that passes aux input to two ta2020 amps. in this case only an amp is running with two speakers
An externally hosted image should be here but it was not working when we last tested it.
here is the amp box. connection only one side, the simplest as possible. on the borders rca for speakers, 4 output out of 2 amps. in the middle 3,5 stereo input and power input
An externally hosted image should be here but it was not working when we last tested it.
here is the amp box - upper side is for power: general on/off switch, and voltmeter activated via tactile switch.
in the middle are amps leds (arjen provides them for free! thanks man) for power & overload, and volume pot for amps
on the lower side the mp3/fm/aux unit (with remote)
An externally hosted image should be here but it was not working when we last tested it.
i can open the plastic casing to check volts, and manage volume and player, difficult to notice, but a usb key is plugged and giving mp3 to player
An externally hosted image should be here but it was not working when we last tested it.
if i put speakers sitted on the floor, they have a smoother response!
I bet for it . The floor drains the extra energy stored by the plastic pipe .
If you glued a lead foil inside it that wouldn't have happened . And felt over it .
Seems like you're at half way .didn't you first say to make a U-turn ?
If solidness is maintained , see for example :
The attach of the woofer to the body .If you can see the light ,it's too thin .
Everything needs to go to a beauty-farm 😎
Or at least to some reinforcement camp .
Last edited:
pipes are all covered on the inside with car damping material. since you're italian as me, we call them "fogli bituminosi antirombo". this already do the work you suggested for lead, i think.
can you please help me with impedances? when the signal comes from pc, i can spruce a great volume! but when sounds comes out of the panel mp3 player, volume is quite lower.
in those two conditions, setup is always the same:
aux -> bypass panel player -> 50k alps pot -> two amps (louder)
mp3 panel player -> 50k alps pot -> two amps (softer)
i think that is a problem of matching impedances between player and amps
can you please help me with impedances? when the signal comes from pc, i can spruce a great volume! but when sounds comes out of the panel mp3 player, volume is quite lower.
in those two conditions, setup is always the same:
aux -> bypass panel player -> 50k alps pot -> two amps (louder)
mp3 panel player -> 50k alps pot -> two amps (softer)
i think that is a problem of matching impedances between player and amps
Or is that the power rating of the MP3 panel player? I bet it's much lower than that of the PC headphone jack.
thanks borispm, it's a useful tip.
do you know how i can measure this? i have some chinese specs of my amp, i'll try to post them for the brave goodwilling man.
i have a little fear of doing a stress to amps by overloading signal, but maybe this is the only way.
looks like i should apply a tranaformer, do you agree? which do you suggest? i noticed a lot of use of the neutrik ones.
some cheap way would be those:
Boostaroo Headphone Amplifier & Splitter ipod mp3 su eBay.it Apple iPod Accessories, MP3 Player Accessories, Consumer Electronics
USB Powered Boostaroo Headphone Amplifier and Splitter su eBay.it Universal MP3 Accessories, MP3 Player Accessories, Consumer Electronics
http://cgi.ebay.it/FiiO-E5-HEADPHON...Accessories&hash=item1c12d9ebed#ht_2717wt_913
Fiio E3 Portable Headphone Amplifier ipod mp3 shure su eBay.it Apple iPod Accessories, MP3 Player Accessories, Consumer Electronics
Fiio E5 portable headphone amplifier ipod mp3 su eBay.it Universal MP3 Accessories, MP3 Player Accessories, Consumer Electronics
do you copy?🙂
do you know how i can measure this? i have some chinese specs of my amp, i'll try to post them for the brave goodwilling man.
i have a little fear of doing a stress to amps by overloading signal, but maybe this is the only way.
looks like i should apply a tranaformer, do you agree? which do you suggest? i noticed a lot of use of the neutrik ones.
some cheap way would be those:
Boostaroo Headphone Amplifier & Splitter ipod mp3 su eBay.it Apple iPod Accessories, MP3 Player Accessories, Consumer Electronics
USB Powered Boostaroo Headphone Amplifier and Splitter su eBay.it Universal MP3 Accessories, MP3 Player Accessories, Consumer Electronics
http://cgi.ebay.it/FiiO-E5-HEADPHON...Accessories&hash=item1c12d9ebed#ht_2717wt_913
Fiio E3 Portable Headphone Amplifier ipod mp3 shure su eBay.it Apple iPod Accessories, MP3 Player Accessories, Consumer Electronics
Fiio E5 portable headphone amplifier ipod mp3 su eBay.it Universal MP3 Accessories, MP3 Player Accessories, Consumer Electronics
do you copy?🙂
Love the tecky sticky thing 🙄 but please remain on the tracks :If you compare velocity of air in different materials you'll see how ,given a distance or length ,the time it takes from start to end ,changes a lot . Much difference there will be between a 2mm bitumen foil and a 2mm lead foil . For the purpose ,which is to prevent directional movements ...the on-axis movement that I guessed was quieter when on the floor ,and the wavy one 
which also leads to structure deformation . You haven't done anything to have this minimized .
which also leads to structure deformation . You haven't done anything to have this minimized .
Multiple materials (sandwich) works even better
In this case ,since 4mm PCV is thin ,so lead is useful for rigidity.
Plus bitumen , for extra damping .
Plus 1 cm felt or any open cell ,for sound absorption .
In this case ,since 4mm PCV is thin ,so lead is useful for rigidity.
Plus bitumen , for extra damping .
Plus 1 cm felt or any open cell
,for sound absorption .
thanks pico, now i got it.
how much weight and quality will the pipe acquire by doing this improvements?
now it's 2kg, i need it to be light to carry 2 of those on my backpack.
how much weight and quality will the pipe acquire by doing this improvements?
now it's 2kg, i need it to be light to carry 2 of those on my backpack.
hey ciao voltcontrol.
written many times that i will use two arjen's mkiii amp: they use ta2020 ic from tripath.
maybe you could help me in a doubt i have:
can i use a headphone amplifier as preamp for a class t amplifier?
written many times that i will use two arjen's mkiii amp: they use ta2020 ic from tripath.
maybe you could help me in a doubt i have:
can i use a headphone amplifier as preamp for a class t amplifier?
Sorry for keeping you in thread , though it could be misunderstood as it should be considered as "system" ,non only X-ways speakers 🙄
When in post #1 you claimed the use of elliptical speakers , I was thinking of some old paper cone ,which might sound delightful . Of course the piezo-plastic in the center has to be removed .
Not yours ,which is delightful ...😀
When in post #1 you claimed the use of elliptical speakers , I was thinking of some old paper cone ,which might sound delightful . Of course the piezo-plastic in the center has to be removed .
Not yours ,which is delightful ...😀
btw, actually thinking on a tigerskin painting for the pipes: some random black curved stripes will give a "roar" to the box...
any suggestion?
any suggestion?
some work and listening has passed since my forst posts, so speaker became different form my intentions, and gradually i am leaving behind the tqwl idea. simply i'll add a longer curved vent. this will have a great boost in quality, and won't occupy much space.
i did some more measurement and projections, and here i am to share results.
the setup changed:
speaker will be vented short / vented long, instead of vented / transmision line. (but anyway i'll try someday to apply a 70 cm long pipe to the end and see what happens.
no basscut will be applied, since i'm not able to calculate correctly the capacitor size! if a help will come, it will be very welcome (input cap actually is 2.2uf, and res is 20k; amp is arjen ta2020 - i would like to cut bass to save energy without affecting sound quality and loudness.)
a question about simulation in winisd: i calculated volumes for the box incuding the reductions. is this corect?
the curved long vented design enhances clearity: a lot! and it doesn't affect loudness!
speaker pipe with short vent - orange colour on graph
400x190mm = 11.341149l - 0.68l = 10.661149l
100x154mm = 1.86265l
speaker pipe with 10cm long straight reduction = 12.523799l
vent is a 154mm large, 100mm long, flanged end
speaker pipe with long vent - blue colour on graph
400x190mm = 11.341149l - 0.68l = 10.661149l
370x154mm = 6.891806l
speaker pipe with 37cm curved reduction = 17.552955l
vent is a 154mm large, 370mm flanged end
and some random pics of various setups (this is what i like most)
stereo in the garden - listening: Barry White - Your sweetness is my weakness
1ch only outside - listening: Dillinger - Rockers
just before blasting the roads with Mighty Sparrow
this summer i'll go raw and gipsy! yo my speakers are two 15 liters can while i trip. is there any croatian reader? i will pass from croatia after 15th of july - let's party...😉
i did some more measurement and projections, and here i am to share results.
the setup changed:
speaker will be vented short / vented long, instead of vented / transmision line. (but anyway i'll try someday to apply a 70 cm long pipe to the end and see what happens.
no basscut will be applied, since i'm not able to calculate correctly the capacitor size! if a help will come, it will be very welcome (input cap actually is 2.2uf, and res is 20k; amp is arjen ta2020 - i would like to cut bass to save energy without affecting sound quality and loudness.)
a question about simulation in winisd: i calculated volumes for the box incuding the reductions. is this corect?
the curved long vented design enhances clearity: a lot! and it doesn't affect loudness!
speaker pipe with short vent - orange colour on graph
400x190mm = 11.341149l - 0.68l = 10.661149l
100x154mm = 1.86265l
speaker pipe with 10cm long straight reduction = 12.523799l
vent is a 154mm large, 100mm long, flanged end
speaker pipe with long vent - blue colour on graph
400x190mm = 11.341149l - 0.68l = 10.661149l
370x154mm = 6.891806l
speaker pipe with 37cm curved reduction = 17.552955l
vent is a 154mm large, 370mm flanged end
and some random pics of various setups (this is what i like most)
stereo in the garden - listening: Barry White - Your sweetness is my weakness
1ch only outside - listening: Dillinger - Rockers
just before blasting the roads with Mighty Sparrow
this summer i'll go raw and gipsy! yo my speakers are two 15 liters can while i trip. is there any croatian reader? i will pass from croatia after 15th of july - let's party...😉
Nice ! Turbo-folk in the Balcans !
I went to Corse with a black PX 125 just like that !!! But I didn't have hard bags !!
Cheers !
Ps. You can put a double switch (double-double for stereo) for commuting between two CR networks for the input high pass filter.
I went to Corse with a black PX 125 just like that !!! But I didn't have hard bags !!
Cheers !
Ps. You can put a double switch (double-double for stereo) for commuting between two CR networks for the input high pass filter.
Last edited:
pico, you're very kind in following the thread, thanks.
the problem is that i don't have resources for designing a CR network. i need help for this. what will be your suggestion if:
my amp cap is 2.2uf
my amp res is 20k
i want to use a dual gang three ways break-before-make rotary switch that selects between:
1) full range (2.2uf, 20k)
2) highpass for a speaker tuned at 144hz (orange line) (?uf, 20k)
3) highpass for a speaker tuned at 81hz (blue line) (?uf, 20k)
can u please help me in configuration of CR network? what would be your suggestion for caps, based on speaker's graph
loads of thanks
the problem is that i don't have resources for designing a CR network. i need help for this. what will be your suggestion if:
my amp cap is 2.2uf
my amp res is 20k
i want to use a dual gang three ways break-before-make rotary switch that selects between:
1) full range (2.2uf, 20k)
2) highpass for a speaker tuned at 144hz (orange line) (?uf, 20k)
3) highpass for a speaker tuned at 81hz (blue line) (?uf, 20k)
can u please help me in configuration of CR network? what would be your suggestion for caps, based on speaker's graph
loads of thanks
Last edited:
But I don't think ,actually ,those 80 and 140 Hz are really the Fo of your boxes.
The idea to cut some low frequencies might be good to save some battery power.Usually someone needs a bass boost ,not the opposite 😕
At line level ,I seldom used a 120 Hz hp ,CRCR . The first capacitor being 330
nF,then 3k3.Then another cap of 100 nF and 18 k Ohm (which is in the 20 K ohm range ...) ;keeping the same resistors values and swapping scalable capacitor values you can change the "bend" . Now with that 2,2uF you'll get an hp of about 5-10 Hz ... the duty of that cap is to isolate the entire amp circuitry and keep it safe from direct current.
The idea to cut some low frequencies might be good to save some battery power.Usually someone needs a bass boost ,not the opposite 😕
At line level ,I seldom used a 120 Hz hp ,CRCR . The first capacitor being 330
nF,then 3k3.Then another cap of 100 nF and 18 k Ohm (which is in the 20 K ohm range ...) ;keeping the same resistors values and swapping scalable capacitor values you can change the "bend" . Now with that 2,2uF you'll get an hp of about 5-10 Hz ... the duty of that cap is to isolate the entire amp circuitry and keep it safe from direct current.
i think i'll do a simple cr network
my cap is actually 2.2uf, with a 20k resistor.
i'll switch to a 0.1uf cap for cutting at 80hz, and things will remain simple.
am i losing a big advantage by not using a crcr network?
have you got any clue for a good cap that i can buy those days? i need to buy 12 pieces. 4 for 80hz filtering, 8 for 40hz filtering (i will put two of em in parallel)
my cap is actually 2.2uf, with a 20k resistor.
i'll switch to a 0.1uf cap for cutting at 80hz, and things will remain simple.
am i losing a big advantage by not using a crcr network?
have you got any clue for a good cap that i can buy those days? i need to buy 12 pieces. 4 for 80hz filtering, 8 for 40hz filtering (i will put two of em in parallel)
- Status
- Not open for further replies.