hulika

Author Topic: mga DIY speaker cabinet users/builders post your pic here  (Read 128762 times)

Offline djonathan

  • Senior Member
  • ***
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #375 on: May 14, 2011, 01:21:50 PM »
pa bookmark muna maya ako mag babasa.
kung yung item mo kaya ang baratin ko hindi ka kaya mainis?

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #376 on: May 14, 2011, 06:02:37 PM »
@hanns1976

I have built this a very long time ago...it's a rejuvenation/restoration job...MDF ang ginamit na wood namin...
using original driver i will say that performance is just ok...but not impressive.

Siguro sa mga limited space na install ok na ito...pero kung "ako" hindi ko na ito gagawain ulit.

Matanong ko lang Sir saan mo ba balak gamitin?...

Magandang araw,
jojo
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline hanns1976

  • Philmusicus Noobitus
  • *
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #377 on: May 15, 2011, 05:03:39 AM »
@hanns1976

I have built this a very long time ago...it's a rejuvenation/restoration job...MDF ang ginamit na wood namin...
using original driver i will say that performance is just ok...but not impressive.

Siguro sa mga limited space na install ok na ito...pero kung "ako" hindi ko na ito gagawain ulit.

Matanong ko lang Sir saan mo ba balak gamitin?...

Magandang araw,
jojo


Sir plan ko lang po sana in/out door use for parties, im getting hold of an 802 for mids and highs, gusto ko lang po sana bumagay, ive seen this sa megamall circa 1993-94 sa megamix record bar, that time it only cost 20k, i was trying to hold orig ones as of now meron akong nakita sa sulit.com.ph selling at 50k, medyo mataas siya compare sa new ones where unfortunately eh BOSE stop this 302B production.

so i was thinking sir to build one, nakakita rin ako nito sa raon before but the contents are not 2 12" but 15" medyo boomy and not that punchy bass, i was told researched on the freq response nasa 50Hz lang and low end.

yes sir my space is limited kasi, i will mainly use it indoor, pero if required like new year and street part outdoor use siya. will it be worthit? nagagandahan lang ako sa built niya its not that huge but the impact of bass is great well for the original, i just dont know what will be the outcome if i will build one or if permited sir mga how much pagawa sayo nito?

thanks sir also what would you recommend for a bass bins for limited space, but with a loud impact?

thanks po ng madami master.       

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #378 on: May 15, 2011, 05:31:31 AM »
@hanns1976

Sir using the original driver it was not that matibay and since it is a bandpass...one note lang siya as in good lang siya at certain frequency maybe tuned at 50hz...but, that was the bose driver of the forgoten Era...should you really want to have this box aesthetics and use present driver with long excursion and big motors...palagay mas maganda na siya sa original version at mas matibay pa.

Kung maliit na box ang kailangan mo anong po ang footprint size para may idea ako ano ang box na babagay...

Magandang araw,
jojo
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline hanns1976

  • Philmusicus Noobitus
  • *
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #379 on: May 15, 2011, 11:20:10 AM »
@hanns1976

Sir using the original driver it was not that matibay and since it is a bandpass...one note lang siya as in good lang siya at certain frequency maybe tuned at 50hz...but, that was the bose driver of the forgoten Era...should you really want to have this box aesthetics and use present driver with long excursion and big motors...palagay mas maganda na siya sa original version at mas matibay pa.

Kung maliit na box ang kailangan mo anong po ang footprint size para may idea ako ano ang box na babagay...

Magandang araw,
jojo

Sir for in door use 23" x 23" po ang alloted space.

by the way sir do you know Sir pilyo of Pdvd hes located at Harison Pasay, ill be getting JBL subwoofers from him. so i think it will perform good on those 302B bass bins sir. 

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #380 on: May 15, 2011, 01:01:09 PM »
Sir for in door use 23" x 23" po ang alloted space.

by the way sir do you know Sir pilyo of Pdvd hes located at Harison Pasay, ill be getting JBL subwoofers from him. so i think it will perform good on those 302B bass bins sir. 

23"X23"...is this a fixed installation and is height not a problem?

Hindi po ako kilala nun Sir...

maagandang araw,
jojo
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline hanns1976

  • Philmusicus Noobitus
  • *
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #381 on: May 15, 2011, 02:04:40 PM »
23"X23"...is this a fixed installation and is height not a problem?

Hindi po ako kilala nun Sir...

maagandang araw,
jojo

Sir height can stack up to 6 feet lang pang indoor, and its not a fixed installation.

btw got your msg also thanks sir 

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #382 on: May 19, 2011, 05:49:41 AM »
Just finished one set...



Magandang araw,
jojo
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline skyjammer

  • Forum Fanatic
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #383 on: May 19, 2011, 07:47:00 AM »
Just finished one set...

Magandang araw,
jojo
Wow!!!!  :-o :-o :-o

Next na ba yung pang-bridge ko sir? Ano nga ba tawag nun? :)

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #384 on: May 19, 2011, 07:52:48 AM »
Wow!!!!  :-o :-o :-o

Next na ba yung pang-bridge ko sir? Ano nga ba tawag nun? :)

Naku!!!...salamat po...pero OT tayo sa Bridging Module mo Sir...Mr. Gerry Morales is the assembler...design lang ako...txt ka daw niya when everything is very well tested na...pasenya na we must be sure it's fool proof.

Magandang araw,
jojo
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline skyjammer

  • Forum Fanatic
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #385 on: May 19, 2011, 09:30:32 AM »
Naku!!!...salamat po...pero OT tayo sa Bridging Module mo Sir...Mr. Gerry Morales is the assembler...design lang ako...txt ka daw niya when everything is very well tested na...pasenya na we must be sure it's fool proof.

Magandang araw,
jojo

Salamat!

Sorry sa OT, people. :)

Offline ermita

  • Senior Member
  • ***
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #386 on: May 19, 2011, 02:15:15 PM »
Another set finish... :-o..

Jo,  you really mastered that WSX and MT122 set. Nice...does the MT happy to keep up with WSX.

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #387 on: May 19, 2011, 02:26:11 PM »
Another set finish... :-o..

Jo,  you really mastered that WSX and MT122 set. Nice...does the MT happy to keep up with WSX.

Hindi po naman Sir...salamat po...the is does the WSX can keep up with the MT's???...that is the question...hehehe

I would say a pair of MT122 should be fine with a group of 4 WSX...

Magandang araw,
jojo
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline septoclens

  • Regular Member
  • ***
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #388 on: May 19, 2011, 03:05:12 PM »
sir jojo, ano po ang mas maganda? w-box or tong wsx?
may drawing po ba kayo nito yung kita yung height,width and leght?

TIA!

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #389 on: May 19, 2011, 03:34:36 PM »
sir jojo, ano po ang mas maganda? w-box or tong wsx?
may drawing po ba kayo nito yung kita yung height,width and leght?

TIA!



Magandang araw,
jojo
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #390 on: May 19, 2011, 03:52:31 PM »
@septoclens

Simpleng technical na sagot lang ang ibibigay ko sa iyo...

ang WBOX aka "Subzero"...ay 1/8 w/l ng 40hz...sa madaling salita para mabuo ang 40hz kailangan mo ng 8 wbox.

ang WSX...ay 1/4 w/l ng 38hz...para mabuo ang 38hz kailngan mo ng 4 na WSX.

Magandang araw,
jojo

Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline trance

  • Regular Member
  • ***
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #391 on: May 19, 2011, 04:41:09 PM »
Sir height can stack up to 6 feet lang pang indoor, and its not a fixed installation.

btw got your msg also thanks sir 

@sir hans, your topic with sir Jojo caught my interest... kung magagawan ka ni sir Jojo ng 302B siguro i will be second in the motion  :-D, we have same intention kung saan gagamitin (indoor and small outdoor family gatherings) meron din kaming 4pcs of 802-S2, sa ngayon we match up with ACM 15" powered sub... tama po sinabi nyo mas maganda sa mata ang set-up kung may pares na 302B. hopefully makagawa si sir Jojo ng appropriate materials and design.

Offline hanns1976

  • Philmusicus Noobitus
  • *
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #392 on: May 19, 2011, 05:11:50 PM »
@sir hans, your topic with sir Jojo caught my interest... kung magagawan ka ni sir Jojo ng 302B siguro i will be second in the motion  :-D, we have same intention kung saan gagamitin (indoor and small outdoor family gatherings) meron din kaming 4pcs of 802-S2, sa ngayon we match up with ACM 15" powered sub... tama po sinabi nyo mas maganda sa mata ang set-up kung may pares na 302B. hopefully makagawa si sir Jojo ng appropriate materials and design.

lets see bro according to sir Jojo with the present tech, there will be better drivers to drive the 302b cabs, and believe him since i saw sa website ng crown the jack hammer looks promising. i think it will have better punch than the orig hehehe! lets keep our fingers crossed!!!

Offline Ja!

  • Senior Member
  • ***
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #393 on: May 19, 2011, 06:56:01 PM »
@septoclens

Simpleng technical na sagot lang ang ibibigay ko sa iyo...

ang WBOX aka "Subzero"...ay 1/8 w/l ng 40hz...sa madaling salita para mabuo ang 40hz kailangan mo ng 8 wbox.

ang WSX...ay 1/4 w/l ng 38hz...para mabuo ang 38hz kailngan mo ng 4 na WSX.

Magandang araw,
jojo

sir jojo paki elaborate pa nga po,so ibig sabihin po same drivers & same amp,malakas lang ng konti yung 8 wbox sa 4 na wsx? sensya na po sa abala.salamat.

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #394 on: May 19, 2011, 07:16:53 PM »
@septoclens

Simpleng technical na sagot lang ang ibibigay ko sa iyo...

ang WBOX aka "Subzero"...ay 1/8 w/l ng 40hz...sa madaling salita para mabuo ang 40hz kailangan mo ng 8 wbox.

ang WSX...ay 1/4 w/l ng 38hz...para mabuo ang 38hz kailngan mo ng 4 na WSX.

Magandang araw,
jojo

sir jojo paki elaborate pa nga po,so ibig sabihin po same drivers & same amp,malakas lang ng konti yung 8 wbox sa 4 na wsx? sensya na po sa abala.salamat.

Ang pinag-uusapan natin ay Subwoofer...ibig sabihin gaano kababang frequency ang kayang i-produces ng speakerbox configuration.

It is true that 8 wbox will produce higher SPL, but not low enough...i will assume the lowest will be 32hz.
"W"-box provides a 4dB sensitivity increase above 40Hz and a usable response from 32Hz to 400Hz.  The horn mouth size of this enclosure is 1/8 of the size required for a full 40Hz horn.  Hence, stacking 8 JBL “W”-boxes in a 4 x 2 configuration will provide true horn loading down to 40Hz. Because of the inherent midrange coloration of any "W”-horn design, the recommended crossover frequency is 300Hz or lower...Wbox is bass reflex hornloaded configuration highpass filter is recommended to protect drivers from over excursion.

4 WSX will produce 28hz@ -10db...useable frequency 35hz-150hz +/-3db...WSX is sealed 7ft  hornloaded configuration therefore there is no chance that the driver may over excursion due to vacuum space.

Magandang araw,
jojo
« Last Edit: May 19, 2011, 07:27:35 PM by constantpressure »
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #395 on: May 19, 2011, 08:10:18 PM »
MT4...



Magandang araw,
jojo
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline Ja!

  • Senior Member
  • ***
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #396 on: May 20, 2011, 12:05:05 AM »
Eto ang physical comparision nilang tatlo...



Magandang araw,
jojo
sir jojo yun po bang cbe-18 eh considered as "tapped horn-sub"? salamat po.

Offline N1X

  • Senior Member
  • ***
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #397 on: May 20, 2011, 01:17:11 AM »
Ang pinag-uusapan natin ay Subwoofer...ibig sabihin gaano kababang frequency ang kayang i-produces ng speakerbox configuration.

It is true that 8 wbox will produce higher SPL, but not low enough...i will assume the lowest will be 32hz.
"W"-box provides a 4dB sensitivity increase above 40Hz and a usable response from 32Hz to 400Hz.  The horn mouth size of this enclosure is 1/8 of the size required for a full 40Hz horn.  Hence, stacking 8 JBL “W”-boxes in a 4 x 2 configuration will provide true horn loading down to 40Hz. Because of the inherent midrange coloration of any "W”-horn design, the recommended crossover frequency is 300Hz or lower...Wbox is bass reflex hornloaded configuration highpass filter is recommended to protect drivers from over excursion.

4 WSX will produce 28hz@ -10db...useable frequency 35hz-150hz +/-3db...WSX is sealed 7ft  hornloaded configuration therefore there is no chance that the driver may over excursion due to vacuum space.

Magandang araw,
jojo

nice explanation
 :-)

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #398 on: May 20, 2011, 05:16:06 AM »
sir jojo yun po bang cbe-18 eh considered as "tapped horn-sub"? salamat po.

The Cyclope is a peculiar TH design with a complimentary symmetrical parallel horn...

A Tapped horn is one where both sides of the driver are coupled to the horn.
Usually, this kind of horn has a driver you can see near the mouth.
The throat end of the horn connects to the other side of the driver, the side you can’t see.
After the near end driver face, there is some length of horn before the exit.

If you thought of the horn as a letter P, the bottom is the horn mouth; the driver is mounted at the “tap” with one side facing the long way around and the other, the short way.
The idea came about when I observed the reflection in a high frequency horn where the driver was not at the “end”. I wondered what if I substituted an active source (the back side of the driver), now it would be constructive addition.

The advantage is that when you make a bass horn “too small”, it s response, particularly at the bottom, is a series of peaks and dips.
These reflect the changing load the “too small” horn places on the driver instead of a nice resistive load like a BIG horn.

With both sides of the driver driving the horn, but separated by a fixed phase (the path length between the two sides), one finds the two outputs add or not depending on the phase difference between them.
At the low cutoff, only one side of the driver (the longest path) feels a significant acoustic load, this is where the lowest big peak normally is, the region above that where the big wide dip would be, both sides of the driver add together fully, filling in the dip.
In effect, the radiator area of the driver changes with frequency allowing it (in a perfect world) to adapt to the change in resistance.

The above was written by the inventor...Mr. Tom Danley...TH is now fully Patented...not anymore a pending case...there is a legal issue...I guess.

Magandang araw,
jojo
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde

Offline constantpressure

  • Veteran Member
  • ****
Re: mga DIY speaker cabinet users/builders post your pic here
« Reply #399 on: May 20, 2011, 05:18:54 AM »
Tapped Horn

Horns have been used for decades in sound reinforcement to increase the loading on the loudspeaker driver. This is done to increase the power transfer from the driver to the environment in which the sound is radiated. For maximum power transfer to occur an impedance match between the loudspeaker driver and the free air must be established. A horn is the means to this impedance match. For a horn to operate properly it must not be acoustically small compared the frequencies (wavelengths) it is to radiate. Conventional horn theory and design formulae are based on this assumption. To meet this requirement the horn needs to be at least one-half wavelength long at the low frequency cut-off of the horn and the circumference of the mouth must be at least one wavelength. When used for low frequency reproduction this can make for a very large unwieldy horn that can becomes impractical to make or move. A common practice used to reduce horn size is to make it only one-quarter of a wavelength long at the low frequency cut-off. This “short cut” has some very interesting effects on a horn’s performance. Of note is that a quarter wavelength resonance will have a velocity minimum at the throat compared to the half wavelength resonance which will have a velocity maximum at the throat. The net result of this is that, while there will be output from the horn in its low frequency region, the horn will not yield efficient power transfer until the frequency is increased sufficiently to correspond to the horn being one-half wavelength long. This begs the question: Can the quarter wavelength horn be driven efficiently? The answer is a resounding yes. To do so one must examine the conditions presented to the driver at the horn’s throat and match these conditions for maximum power transfer. The velocity minimum condition requires that the proper loudspeaker driver have a much stronger motor (larger magnet) and a larger moving mass than conventional horn theory dictates. The downside is that this driver is not at all well suited to drive a conventional horn. Once the frequency increases to the point that the horn is at least one-half wavelength a conventional horn is exactly what we have. So what we need is a loudspeaker driver that can change its mechanical (Thiele-Small) parameters depending on frequency. No problem because we found the magic stash of Unobtanium! This seemingly impossible feat is accomplished by allowing the radiation from the rear side of the driver to enter the horn at a location (tap) sufficiently far away from the throat (where the front side is driving the horn) and closer to the mouth.. Example of a Tapped Horn Since the rear of the driver is much closer to the mouth of the horn, at very low frequencies it is effectively de-coupled from the system and its radiation does not affect the total output. This occurs due to the throat end being almost one-quarter wavelength away. The radiated pressure from the rear of the driver is reflected from the throat end back toward the mouth. The total path length traveled is one-half wavelength (one-quarter down & one-quarter back). The reflected wave arrives 180° out of phase with the original radiated pressure from the rear of the driver and is thus cancelled. As frequency increases the situation changes a bit and the rear of the driver begins to be coupled to the horn as the reflection from the throat end does not cancel its own radiation. When the frequency is such that the horn is one-half wavelength long the rear of the driver is fully coupled to the horn. The pressure from the front and rear of the driver are of reverse polarity; a 180° phase shift at all frequencies. The pressure from the front of the driver (at the throat) and the pressure from the rear of the driver (close to the mouth) are now approximately one-half wavelength apart. This represents a phase shift of 180°. At this frequency both the front and rear of the driver are driving the horn in phase. When this happens the driver’s radiating surface area (Sd), as far is the horn is concerned, had significantly increased (almost doubled). Since the driver radiates from the front and back of the diaphragm, this yields very different driver parameters than when at the one-quarter wavelength resonance condition. To illustrate just how much low frequency extension and overall output can be gained from a small horn loaded box using this technique, modeled simulations of a Tapped Horn and a vented box, loaded with drivers optimized for the performance of each one, are compared in Figure 1. Each enclosure has the same outer cabinet dimensions; 40 in. x 22.5 in x 28 in. While the SPL is comparable for the two units, one of the real advantages of the Tapped Horn is seen in Figure . The diaphragm excursion of the driver is greatly reduced due to the acoustical loading of the horn. With an input of 63 V (500 W) the vented box exceeds 5 mm (0.2 inches) at 90 Hz. The Tapped Horn is well below this until just above 55 Hz. The vented box reaches 9 mm at 55 & 35 Hz while the Tapped Horn’s excursion peaks at just over 6 mm at 46Hz. This decrease in excursion will translate directly into lower distortion and higher output capability from the Tapped Horn.

Taken from Danley's White paper...

« Last Edit: May 20, 2011, 07:22:22 AM by constantpressure »
Never look down on anybody, unless you're helping them
Those who have much are often greedy, those who have little always share...Oscar Wilde