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Author Topic: What to consider in Head Amp and Cabinets  (Read 921 times)

Offline mr.HTML

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What to consider in Head Amp and Cabinets
« on: February 26, 2013, 09:12:46 AM »
Mga Sir,

Ano po ba dapat i-consider kapag gagamit ng Head Amps and Cabinets, meron bang compatibility issues between the two?
Need ba dapat ng mataas na watts for Head Amp? meron kasi ako nakikita na ohms and i am not quite sure if it's really necessary na hanapin yung ohms nung makaka-pair nya.  :mrgreen:

Online lolwat

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Re: What to consider in Head Amp and Cabinets
« Reply #1 on: February 26, 2013, 09:00:27 PM »
Ok ganito:

Kung 8 ohms ang rating ng head mo, pwede mo siyang ikabit sa cabinet na rated 8 ohms or higher. Sa madaling sabi, pwede kahit 16 ohms, pero hindi pwedeng 4.

Sa wattage naman, medyo ganun din. Kung 50 watts ang head mo, pwede mo siyang ikabit sa cab na equal or greater wattage rating. So pwedeng single 50 watt speaker, or 4x12 na total ng 240 watts.

Ang recommendation ng ibang site na nababasa ko, yung wattage ng amp head mo multiplied by the square root of two (approx. 1.4142...) yung minimum na speaker cabinet wattage na dapat mong iparis sa kanya. Yun daw yung difference ng RMS at peak wattage ng amp, para sure na hindi mo masira yung speaker kung itotodo mo yung volume ng amp.

Ex. 50 watt head x 1.4142 = 70.71 watts

Pero ang alam ko, may RMS at peak wattage ratings din ang speakers kaya hindi rin siguro masamang pantay lang yung wattage ng speaker at ng amp. Basta wag lang mas mababa yung sa speaker, masisira yun.

Offline gradual nothing

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Re: What to consider in Head Amp and Cabinets
« Reply #2 on: February 27, 2013, 12:00:20 AM »
lolwat is right.. in layman's term.. if malaki ang wattage ng amp mo kesa sa speaker mo.. sabog ang tunog na ilalabas ng speaker mo kapag nilalakasan mo na ang volume, sisirain na ng amp mo ang speaker habang tinotodo mo na din ang volume. walang pinagkaiba yan sa sound system nyo sa bahay kapag mismatch ang amplifier sa speaker in terms of power. pwedeng mas malaki ang wattage ng cab wag lang liliit sa amp
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Offline skunkyfunk

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Re: What to consider in Head Amp and Cabinets
« Reply #3 on: February 27, 2013, 12:29:12 AM »
Mga Sir,

Ano po ba dapat i-consider kapag gagamit ng Head Amps and Cabinets, meron bang compatibility issues between the two?
Need ba dapat ng mataas na watts for Head Amp? meron kasi ako nakikita na ohms and i am not quite sure if it's really necessary na hanapin yung ohms nung makaka-pair nya.  :mrgreen:


If you like mixing speakers in 4x12s or 2x12s, the power handling of the cab will always be  the number of speakers in the cab X the speaker with the least power handling.

Example.  If you get a 4x12 with two G12T75s (75 watts each) and two Greenbacks (G12M25), the maximum power your 4x12 can handle will be 4 X 25W = 100W.  (That is assuming your speakers all have the same impedance.)

Always match the impedance for maximum power transfer.  In general, tube amps will not blow even with lower impedance loads than the prescribed.  Say your Marshall tube head is set to see a 16ohm load, and you connect an 8ohm load, or even a 4 ohm load, that will be fine.  In fact a tube amp will not  get broken with a short circuit load. 

SS amps are the opposite.  They can work with higher impedances than prescribed.  Even an open circuit load (infinite load) is fine.

Offline mr.HTML

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Re: What to consider in Head Amp and Cabinets
« Reply #4 on: February 27, 2013, 10:05:25 AM »
Thank you po sa matyagang pag papaliwanag, even tho na nose bleed ako it's really helpful  :)

Grabe hanggang dito hinahabol ako ng Math kainis lang. Well anyway it's really good to know na may mga dapat iconsider sa pag pili ng Amps and Cabs.

Thanks to the following

skunkyfunk
lolwat
gradual nothing


Offline titser_marco

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Re: What to consider in Head Amp and Cabinets
« Reply #5 on: May 10, 2018, 08:06:24 PM »
impedance and wattage
I'd rather be sharp than flat.

Online guitaricci

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Re: What to consider in Head Amp and Cabinets
« Reply #6 on: May 15, 2018, 05:54:08 PM »
space!! may lugar ka bang paglalagyan? kung nakatira ka sa isang studio type apartment/condo...i don't think a head/4x12 cab will suit you.

If you have space...then that's when you consider compatibility.  :)
Its not the kill, Its the thrill of the chase...

Offline ryechua

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Re: What to consider in Head Amp and Cabinets
« Reply #7 on: May 16, 2018, 11:53:00 AM »
for me, first thing to consider is roommate/housemate/neighbor. can they tolerate a cranked tube amp (half/full stack)? lol
doh!!!

Online r_chino18

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Re: What to consider in Head Amp and Cabinets
« Reply #8 on: May 16, 2018, 12:59:46 PM »
The head + cab pairing must look good (i.e. the head should not overhang from the cab)!!  :lol:

Online guitaricci

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Re: What to consider in Head Amp and Cabinets
« Reply #9 on: May 16, 2018, 04:16:07 PM »
for me, first thing to consider is roommate/housemate/neighbor. can they tolerate a cranked tube amp (half/full stack)? lol

A cranked Marshall Major tapos naka full stack ka pa. Bigyan mo na lng ng ear muffs mga tao sa paligid  :lol:
« Last Edit: May 16, 2018, 04:18:37 PM by guitaricci »
Its not the kill, Its the thrill of the chase...

Offline titser_marco

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Re: What to consider in Head Amp and Cabinets
« Reply #10 on: November 27, 2018, 03:18:52 PM »
weight and form factor talaga ang big deterrent din e
I'd rather be sharp than flat.

Online raybrig

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Re: What to consider in Head Amp and Cabinets
« Reply #11 on: November 30, 2018, 10:44:41 AM »
Hello mga sir patanong na rin po!

Kasali rin ba yung mga heads na adjustable ang wattage? Lets say pupwede yung Head mo from 100W down to 50W or even 5W (example lang, not sure kung may amp na may ganitong options)

So kunwari mahina yun cab mo, di mo ba dapat ilagay sa 100W yun head? Sa pagkakaintindi ko, mag ooverload yun cab.

Sorry kung mukhang timawa yung tanong ko haha. Nalilito pa kasi ako.

Salamat sa pag intindi!  :-D
For health concerns, PM me. I'll be more than happy to help :)

Online Deadwing

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Re: What to consider in Head Amp and Cabinets
« Reply #12 on: December 01, 2018, 12:42:49 AM »
Hello mga sir patanong na rin po!

Kasali rin ba yung mga heads na adjustable ang wattage? Lets say pupwede yung Head mo from 100W down to 50W or even 5W (example lang, not sure kung may amp na may ganitong options)

Newer lunchbox-size amps that Orange has been churning out lately (like the Brent Hinds model) have switches at the back panel that allow you to go from 15W to 1W. 
« Last Edit: December 01, 2018, 12:46:59 AM by Deadwing »

Online robinonibor

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Re: What to consider in Head Amp and Cabinets
« Reply #13 on: December 03, 2018, 08:28:12 AM »
Hello mga sir patanong na rin po!

Kasali rin ba yung mga heads na adjustable ang wattage? Lets say pupwede yung Head mo from 100W down to 50W or even 5W (example lang, not sure kung may amp na may ganitong options)

So kunwari mahina yun cab mo, di mo ba dapat ilagay sa 100W yun head? Sa pagkakaintindi ko, mag ooverload yun cab.

Sorry kung mukhang timawa yung tanong ko haha. Nalilito pa kasi ako.

Salamat sa pag intindi!  :-D

 I doubt merong 100W down to 5w. not sure tho.
If you want to calm the tits of 100W amp, get an amp attenuator.

Offline Stoop

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Re: What to consider in Head Amp and Cabinets
« Reply #14 on: December 04, 2018, 05:33:38 AM »
Kung tama pagkakaintindi ko kung may 100 watts ka na amp, you can still use it with an equal wattage or lower AS LONG AS HINDI FULLY CRANKED ang amp mo, the issue na pwedeng sumabog ang speakers will only happen if you keep blasting it with a fully cranked amp to the wattage it has.

As for the lowering ng wattage, several amps already provide this type of attenuation built in, as samples:

1. Mesa Royal Atlantic 100 can go as low as 4 - 7 watts ata using power soak / attenuation
2. Mesa Triple Crown 100 can hit 3 watts using the same power soak technology
3. Laney Ironheart 60 - 120 watt heads (may varying attenuation that can go from full on 60 - 120 watts down to less than 1 watt)
4. Orange Rockerverb does this to an extent pero alam ko hanggang 30 watts lang minimum na kaya nya.

Also if you are planning to own a huge wattage amp, keep in mind that most of them "open up" their sound when they are cranked or pushed so if you opt to use it at lower volumes make sure na maganda yun taper ng master volume ng amp.

Online Ralph_Petrucci

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Re: What to consider in Head Amp and Cabinets
« Reply #15 on: December 04, 2018, 10:48:55 AM »
Hello mga sir patanong na rin po!

Kasali rin ba yung mga heads na adjustable ang wattage? Lets say pupwede yung Head mo from 100W down to 50W or even 5W (example lang, not sure kung may amp na may ganitong options)

So kunwari mahina yun cab mo, di mo ba dapat ilagay sa 100W yun head? Sa pagkakaintindi ko, mag ooverload yun cab.

Sorry kung mukhang timawa yung tanong ko haha. Nalilito pa kasi ako.

Salamat sa pag intindi!  :-D

blackstar ata yung may ganyan. stepdown ng wattage.

normally, rule of thumb is, yung impedance ang titingnan mo kung match ang speakers sa head.
hahaha ako binibiyak ko muna yung wetpaks para makita kung may yellow thingy hahahaha