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|7th January 2011, 11:33 AM||#1401|
Join Date: Sep 2010
Location: Ilocos Sur
sir, base on loudness "lakas" and long reach of bass, which is which between SUB ZERO (or they call w-bin?) versus EL-36 bin? what about base on outdoor and indoor cases in which you can feel better chest punch.
|7th January 2011, 09:14 PM||#1402|
Subzero is just given name here in the Philippines...they are old school folded horn vented box "wbox" designed by Dr. Keele in 1977.
here read the specs.
K151 or 2240H "W” Horn
In answer to long-standing requests from dealers and end users, JBL is pleased to make available this plan for user construction of a "W"-format folded horn designed specifically for the JBL K151 18-inch loudspeaker.
The K151 "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.
These low frequency systems can be used as woofers in discotheques, bass guitar or organ pedal systems, or, when stacked in multiples, as the low end section of a three or four-way rock reinforcement system.
Because of the inherent midrange coloration of any "W”-horn design, the recommended crossover frequency is 300Hz or lower.
These plans are designed for 3/4" high density fir plywood. All joints must be glued and secured with 1-1/4" #8 wood screws spaced every 5 inches. Although omitted from the plans for clarity, all butt joints require I" x I" glue blocks running the length of each joint in order to maintain structural rigidity. If the enclosure will be used in portable or road service, heavier bracing may be required.
All interior surfaces of the chamber in which the K151 is mounted (except for the baffle panel) should be lined with I" fiberglass. This may be attached to the walls with staples or glue.
Piece 7 is a removable panel which allows access to the chamber for mounting the K151. The shortest dimension of the opening covered by piece 7 must be no less than 7-5/8" so that the loudspeaker will fit into the chamber. Piece 7 should be secured to pieces 13 and 14 with at least 10 #10-32 screws and T-nuts. Foam tape or caulking installed around the perimeter of the access opening will maintain the required air seal.
The K151 is secured to piece 15 by eight screws and T-nuts. The T-nuts should be installed in piece 15 before it is assembled to piece 6. The K151 bolt hole circle is 17-3/8” and the T-nut should be installed at 45 º increments.
No provision for connecting the loudspeaker to an amplifier is shown. The builder should select the connection method most suitable for his system.
"W” Horn for K151 18" Driver.
A medium-throw "W” folded horn with vented-box rear air chamber for use with our K151 18” driver providing uniform response from 55 Hz to 400 Hz when used singly in half-space environment. Its folded configuration allows a full 4 ft. long 40 Hz flair-rate exponential horn to be packaged in a relatively compact enclosure. A 5 cu. ft. 35 Hz tuned vented-box rear air chamber provides useable response and full 150 watt power handling capacity down to 32 Hz. The horn is designed to be used in multiples (2 to 8 units) to provide flat response to below 40 Hz in environments where reflective surfaces are not available. A single unit can generate some 15 to 20 acoustic watts at full power input in the 60 to 400 Hz range with less than 3% harmonic distortion.
For single unit in Half-Space (single reflective surface).
Axial SPL: 60 Hz to 1 K Hz 3dB
Power: 55 Hz to 400 Hz 3dB
*Both on axis and total acoustic power frequency responses are given for the system. The axial response gives the output under free-field or outdoor conditions (or the direct-field in a reverberant space) while the power response indicates what one should expect if the system is used in a reverberant indoor or enclosed space.
Sound Pressure Level:
(re 20 uPa, nominal impedance assumed)
at 1 m (3.3 ft), 1 watt input:
103 dB (Ave. 80 to 400 Hz)
at 1 m, full power (150 watts) input:
124 dB (Ave. 80 to 400 Hz)
15% (Ave. 80 to 400 Hz)
Maximum Input Power:
(Nominal impedance assumed)
Continuous (narrow band or sinewave): 150 watts (above 32 Hz)
50 watts (below 32 Hz)
1500 watts *
The above is one box sitting on the ground without parallel walls. If used in a venue with parallel walls (indoor), performance will depend on the distance of the parallel walls. There are room modes to be considered.
The same case goes to CV L-36 only this time the box is folded horn sealed box and it is a 1/4 wavelength of approx. 40hz, so you need them in group of 4.
Chest thumps is around 60hz to 90hz, in our setup it is the Mid tops job since our subs are crossed 40hz below (WSX and TappedHorn).
Plans are available here in 3d view...DIY Speakerbox
|8th January 2011, 09:24 AM||#1404|
Your welcome sir anytime.
In my personal taste I would always prefer the sound of L36 especially on liveband setups, they sound fuller on the kick drums, while the sub0 sounds too punchy but "nandoon ung lagkit ng kick" but lacking the low end ooomph. Well that just my two cents.
|11th January 2011, 06:19 AM||#1406|
Join Date: Jan 2011
Official Distributor here of Pioneer, Wharfadale, Klipsch, Konzert, etc.
Zamony Venture Corporation
710 Apelo Cruz St., Malibay,
Pasay City 1300 Philippines
Trunkline : (632) 852 6706 or (02) 852 6706
Fax. No. : (632) 851 3428
Email : email@example.com
pa-patch ka na lang sa technical dept. ng konzert products or
micro acoustic industry... under in one roof din sya sa Zamony..
so probably kung sino ang authorized service shop nila sa Pioneer
ay yun din ang recommended shop nila sa konzert... imho...
pero kayang-kaya naman yan siguro ng ibang electronics shop
kaya siguro yung mapagkakatiwalaan mo na lang na shop po or yung
mga recommended techie like here in this forum... imho...
about sa konzert website...
wala rin akong makitang dedicated para sa mga amps nila eh...
yung mga speakers meron... china site pero yung products ay
available din dito sa atin...
link-->MICRO ACOUSTICS (XIAMEN) CO., LTD
if may violation po sa post ko... sorry po... just wanna help...
@ sir audiomachines
tiga-silang pala kayo... ako sa dasma... puwede po magtanong..?
wala rin me masyadong alam about audio tech eh... I have a
konzert amp av-502A... napansin ko lang parang hindi synchronized
yung volume nung amp... i mean... bago ko marinig talaga yung
sounds na lalabas sa speaker ay nasa bandang 8 o'clock position
na yung volume knob... yung left speaker side pa lang yun... at
bago ko marinig naman yung sa right side speaker at sumabay ng
tunog sa left speaker ay dapat konting pihit pa... normal ba ito or
may diperensya..? wala namang issue yung speaker and na-try ko
na ring pagpalitin sila... gusto ko kasi pag turn ko nung volume knob
ay sabay na silang tutunog agad... at tsaka isa pa pala... normal din
ba na sa bandang 8 o'clock position pa dapat yung volume knob bago
ko totally marinig yung sounds..? gusto kasi yung tipong nasa 7 o'clock
position pa lang ay sabay na sila dapat tumutunog... not a bigger issue
para sa akin kung tutuusin kasi laging nasa 10 o'clock position naman
ako or mas mataas pa yung volume (mahilig mambulabog heheh) baka
kasi yung abnormality na yun pala ay simula na ng pagkasira nung amp...
para kung kailangan ng paayos ay maagapan ko na agad... already tried
balancing pero ganuon pa rin po... yung left pa rin nauuna at sasabay na
lang after yung right... then oks na... first time user kasi me ng amp and
boxed speakers... pamini-mini compo lang me dati kaya i'm not used to how
music source(cd/dvd/mp3 player), amp plus a pair of big speakers behave..
btw... pair of speakers(konzert kss-12, 450w 8 ohms each).
|11th January 2011, 04:40 PM||#1407|
Join Date: Jan 2007
Last edited by alvin_alvin69; 11th January 2011 at 04:46 PM.
|12th January 2011, 01:01 AM||#1410|
sir alvin_alvin is right, the problem is your vol pot, it may have a dirty or a dead spot on the carbon track.
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