Thanks Skip and Premier Guitar. Nice to see a professional, and comprehensive, job done in a DIY tutorial. Even a novice can complete this important task.
I'm an Electrical engineer. The impedance of a circuit is the sum of resistance (dc) and the Xc and Xl (ac) resistances. Using an ohm meter you only get the dc part of the impedance. Measuring as reactance is difficult with out special equipment. Also the result is frequency dependent. What all this means is for the speaker system you have impedance is equal to the resistance of the speaker + the resistance of the the wire + the resistance of the circuit caparance + the resistance of the inductance. If you model your speakers, tbe Z (impeadance) will come out to real close to 16 ohms. Capacitive reactance, XC = 1 / (2 × π × f × C) where: XC = reactance in ohms (ohm), f = frequency in hertz (Hz), C = capacitance in farads (F) inductive resistance is simular to capacitive resistance XL = (2 x PI x f x l) if you do the math you can see how XC and XL can cancel each other out at some frequency at that the circuit becomes restive ( Z=R) that frequency is at resonance. In speakers you don't want to happen because maximum current flow happens. Feel free to ask any questions you want.
I miss spoke above. You do want xl and xc to cancel each other out. Then zin = zout there is maximum power transfer. P=i^2r. It hurts to try to remember stuff i learned 50+ years ago.
Appreciate the info. Like the way you simplify and what to look for. Especially doing the top speakers first and doing it upright to avoid dropping screwdriver or whatever through speaker. You're right, that would make for a bad day. Thanks again. Good stuff!
I just bought a used 412 cab from guitar center, got it home and realized only 1 12 was working. this video help me re wire and get all of them working. thanks a ton.
nice 2 part vid.. even tho i knew most of the content already its always nice to see a great tutorial on any subject, :) last time i did this was to a 1970 traynor 2x12 cab that i got for almost nothing that was loaded with 2 12watt house speakers.. ended up using 2 150watt electrovoice loudspeakers for a total of 8 ohms.. closed back.. sounded great running off a marshall 1x12 80 watt combo.. had way more headroom than i really needed.. information is priceless. i hope a few people out there can heed some good advice :)
Thanks for this great video, I've played with electronics a long time but just plain for got you had to have both wires on the same side on those type of jacks instead of the ground wire in the back and the hot wire on the front on the opposite side, I just could not remember and thought the other way was wrong but it is not, you forget a bit when you get older. I'm wiring a Marshall 65 cab I built and that was the last part I needed to do, much appreciated.
Another video I'd like to see is really in-depth demo (like this one) of how electric guitar signals are propagated along the long, complex signal pathways of a professional stage-rig. You do cover some of that in the rig rundown videos. This would be a detailed demo of planning, measuring, phase checking, imp. checking, of the signal path.
hi, great videos! i've a fender champion 40 but their speakers turn distorted at vol 5 and in low tones just break up... im thinking to change speaker, do you think i can get Good Clean sounds with Deep Lows if i replace it? or i just have to change my amp?... thanks your videos are very helpful
great video...thnx....what about I only have 2 12's to go into the 4 12 cab....they are both 16 ohms.....can i run it at 8 ohms parallel....? they came out of a marshall amp....75 watts each
I cant put my hand on a frequency amp.. Why not just put a mp3 song with clean bass on repeat for a few hours at a decent volume ofc.. just to make the speakers vibrate. And regarding the wires inside the cabinet.. i thought thick special wires are better.. just like on a hi-fi amplifier - speakers conection :) I like how you work, nice video
7hotfuzz7 I use the headphones output from my hi-fi amplifier and i go with the wire into the "mp3/line input" of my guitar amplifier. I conect the cabinet to my guitar amplifier ofc, and thats it. My hi-fi amplifier is conected to my pc's audio card, and I play mp3's using my computer. You can check out on my chanel, I have a video where I do a speaker break in using this kind of audio "chain" :)
The easy way to go(when you don't have an frequency generator) is to go on TH-cam, and search for "50 Hz tone" , "70hz tone" etc. And that's it! The same thing. You have to be careful with the volume not to blow the speaker ofc. That's how I did a break in process to my speaker, because with mp3's you have to get too loud so you can make the cone move.
You do not want to put bass through guitar amp speakers. The speakers are not made for the low frequencies. Some amps such as the Bugera trirec, have variance knobs so you can limit the output wattage.
The impedance did not increased because you added a jack mostly increased because the speakers are not anymore facedown to the desk , the gravity influence the impedance of the speaker at rest... if you check the imp. With the Speaker face up you get a different reading if you check face down different reading, if you check sideways different reading , a jack and wires that short can add at maximum 0.2 - 0.3 ohm
He measured the physical resistance of the speakers in parallel which is a DC property. That is not impedance. Impedance is an AC property and varies with current and voltage and must be calculated. Ya can't just hook up an ohm meter and read impedance. Jes sayin'.
The speaker or the cabinet is rated at 16ohm. But when you put a test meter on it it comes out somewhat less - about 20% or so. depending on the ohms of each speaker and how you wire them - series, parallel or series/parallel will result in the impedance (ohms) of the cabinet which needs to match the amp.
You've asked a physics electronics question and may not find the answer on You Tube, Google it, it would honestly take to long to answer here, you may find it in Wikipedia also.
No, you are quite wrong sir, a signal generator is one thing but the question he asked likely unknowingly is just what I stated it is, a physics question I don't have time to answer fully; the generator is an electronics machine to insert a signal to find where in the circuit the opposite signal has ended, I have one and use it often.
Jyme Bale To break in new speakers all you do is plug the signal generator into your amp and sweep the audio spectrum over a period of hours, spend more time in the lower frequency range as high frequencies can overheat the voice coil(s) of the speaker(s). I know this to be true.
I did not know that as I've never used one of those for that, good to know if you want to break them before they should be although it seems now a days everyone wants the pre broken in speaker, I would rather do that my self but then you can also have Weber build a broken speaker that distorts far before normal, I have some that do just that and some that do not for clean, thank you for the info.
Well, ultimately I will throw most of the anachronisms like wire gauges out of the window in favour of reliability and sense. "Made by hand" does not always equate to what people would recognise as "handmade quality"! Popping in a jack parallel to the 1/4", reinforcing the screw locations, etc. would be next. That and modifying the logo to "Mash all". Par for the course I think.
I have a tip for you: when screwing the back, I would suggest making sure that the jack is on top and not bottom, You always have a moron that will walk behind the cab and knock off the ¼ plug thus damaging the entire jack, just mu experience LOL.
"To break in the speakers, just start with 5 watts and work up to 50, then back down." Jesus Christ. Over the course of 30 seconds? an hour? a day? a week? a month? This video gives just enough information that you actually expect to learn a lot, but every time it falls just short so there was no point watching any of it.
THE EXTRA OHM WAS FROM SPEAKER CORD.... RESISTANCE AND IMPEDANCE ARE NOT THE SAME. THE 13.5 OHM IS CORRECT FOR A 16 OHM SPEAKER....STUDY ABOUT IT ELSWHERE...NUFF TEXTING ALREADY
Thanks Skip and Premier Guitar. Nice to see a professional, and comprehensive, job done in a DIY tutorial. Even a novice can complete this important task.
Skip, you really have a talent for teaching. Calm, concise and unambiguous,
The best most informal video anyone could want for installing speakers in a 4x12!! Thank you, great video!! 😊
I'm an Electrical engineer. The impedance of a circuit is the sum of resistance (dc) and the Xc and Xl (ac) resistances. Using an ohm meter you only get the dc part of the impedance. Measuring as reactance is difficult with out special equipment. Also the result is frequency dependent. What all this means is for the speaker system you have impedance is equal to the resistance of the speaker + the resistance of the the wire + the resistance of the circuit caparance + the resistance of the inductance. If you model your speakers, tbe Z (impeadance) will come out to real close to 16 ohms. Capacitive reactance, XC = 1 / (2 × π × f × C)
where: XC = reactance in ohms (ohm), f = frequency in hertz (Hz), C = capacitance in farads (F) inductive resistance is simular to capacitive resistance XL = (2 x PI x f x l) if you do the math you can see how XC and XL can cancel each other out at some frequency at that the circuit becomes restive ( Z=R) that frequency is at resonance. In speakers you don't want to happen because maximum current flow happens. Feel free to ask any questions you want.
Thank you
I miss spoke above. You do want xl and xc to cancel each other out. Then zin = zout there is maximum power transfer. P=i^2r. It hurts to try to remember stuff i learned 50+ years ago.
Great job teaching me this stuff. Brother. It was so clear and concise I think I will be able to do this myself in the future. Thanks man.
Glad it was helpful!
Appreciate the info. Like the way you simplify and what to look for. Especially doing the top speakers first and doing it upright to avoid dropping screwdriver or whatever through speaker. You're right, that would make for a bad day. Thanks again. Good stuff!
I'd appreciate it if a future video actually demonstrated that method he described for breaking in new speakers.
Covered this subject quite nicely, good job guys.
I just bought a used 412 cab from guitar center, got it home and realized only 1 12 was working. this video help me re wire and get all of them working. thanks a ton.
That was a FANTASTIC video! Bravo!
I can watch these sorts of videos for hours and hours. I really need to get a nice amp!
Excellent video, Parts 1 and 2 and presentation. Some very good tips too!
nice 2 part vid.. even tho i knew most of the content already its always nice to see a great tutorial on any subject, :) last time i did this was to a 1970 traynor 2x12 cab that i got for almost nothing that was loaded with 2 12watt house speakers.. ended up using 2 150watt electrovoice loudspeakers for a total of 8 ohms.. closed back.. sounded great running off a marshall 1x12 80 watt combo.. had way more headroom than i really needed.. information is priceless. i hope a few people out there can heed some good advice :)
Thank you sir, I don't think you could have made it any easier / Smarter than you did, I still have both of my brain cell's intact !
Thanks for this great video, I've played with electronics a long time but just plain for got you had to have both wires on the same side on those type of jacks instead of the ground wire in the back and the hot wire on the front on the opposite side, I just could not remember and thought the other way was wrong but it is not, you forget a bit when you get older. I'm wiring a Marshall 65 cab I built and that was the last part I needed to do, much appreciated.
Another video I'd like to see is really in-depth demo (like this one) of how electric guitar signals are propagated along the long, complex signal pathways of a professional stage-rig. You do cover some of that in the rig rundown videos. This would be a detailed demo of planning, measuring, phase checking, imp. checking, of the signal path.
Thanks Skip. Big help and great video.
Hey! Thanks for the video. I'm a beginner, and this totally made sense.
hi, great videos! i've a fender champion 40 but their speakers turn distorted at vol 5 and in low tones just break up... im thinking to change speaker, do you think i can get Good Clean sounds with Deep Lows if i replace it? or i just have to change my amp?... thanks your videos are very helpful
very thorough skip, very good
Excellent video, thank you very much. I'd like to see a demonstration of the speaker break-in sessions.
Thank you! Very useful videos!!
Solid job, brother. Well done.
great video...thnx....what about I only have 2 12's to go into the 4 12 cab....they are both 16 ohms.....can i run it at 8 ohms parallel....? they came out of a marshall amp....75 watts each
*Fantastic. Thanks so much guys.*
Totally. I would use something far heavier and add shrink tubing to the solder joints to relieve stresses from movement.
Great video
I wish you had shown some other diagram examples. I wanted to see parallel wiring.
Do you have a video to explain how to install x pattern of two diff pairs? eg v30s and 12t 75
I cant put my hand on a frequency amp.. Why not just put a mp3 song with clean bass on repeat for a few hours at a decent volume ofc.. just to make the speakers vibrate.
And regarding the wires inside the cabinet.. i thought thick special wires are better.. just like on a hi-fi amplifier - speakers conection :)
I like how you work, nice video
+Roby robert How would you go about playing an mp3 on a cab?
+7hotfuzz7 through the aux or by using an instrument to 3.5mm adaptor
7hotfuzz7 I use the headphones output from my hi-fi amplifier and i go with the wire into the "mp3/line input" of my guitar amplifier. I conect the cabinet to my guitar amplifier ofc, and thats it. My hi-fi amplifier is conected to my pc's audio card, and I play mp3's using my computer. You can check out on my chanel, I have a video where I do a speaker break in using this kind of audio "chain" :)
The easy way to go(when you don't have an frequency generator) is to go on TH-cam, and search for "50 Hz tone" , "70hz tone" etc. And that's it! The same thing. You have to be careful with the volume not to blow the speaker ofc. That's how I did a break in process to my speaker, because with mp3's you have to get too loud so you can make the cone move.
You do not want to put bass through guitar amp speakers. The speakers are not made for the low frequencies. Some amps such as the Bugera trirec, have variance knobs so you can limit the output wattage.
Nice ! Thank you
I have 4x12 celestion speakers each is 8 ohm. which cables to get for a properly parallel connection? Gauge? THX
Awesome video thanks bro learned alot
Awesome video!
Excellent pair of vids!
Whats the music playing background ? what genre ? who is it ?. PLEASE SOMEONE ANSWER :)
Excellent, thank you
Can this wiring accept a switch craft mono/stereo plate with 8ohms per side?
Thanks a lot man ,
Where would be the best place to find jack inputs and jack plates specifically for a Marshall Cabinet MG412A series?
very nice job thank you
The impedance did not increased because you added a jack mostly increased because the speakers are not anymore facedown to the desk , the gravity influence the impedance of the speaker at rest... if you check the imp. With the Speaker face up you get a different reading if you check face down different reading, if you check sideways different reading , a jack and wires that short can add at maximum 0.2 - 0.3 ohm
Do i have to replace the wiring or can i just use the wires that are already there?
Yes always use new solid COPPER wire it's cheap Insurance
He measured the physical resistance of the speakers in parallel which is a DC property. That is not impedance. Impedance is an AC property and varies with current and voltage and must be calculated. Ya can't just hook up an ohm meter and read impedance. Jes sayin'.
i guess I am quite randomly asking but does anybody know of a good place to stream newly released tv shows online ?
@Jadiel Emmanuel Lately I have been using flixzone. Just search on google for it :)
What about the other positive and negative prongs on the jack?
Are anything done with those?
Is it pretty universal to have no insulation and no port or is it just Marshall or just sometimes?
Well done Thanks
Thanks for uuu,r video ,,,bossssss,,,it,s really help me,,,,,,,,
Great info ... Thx!!!!!
is it possible to attach speaker cabinet to a marshall valvestate 8040? a 2 x 12 maybe?
Great tutorial, one question; Why do you call 13.5 ohm a 16ohm
The speaker or the cabinet is rated at 16ohm. But when you put a test meter on it it comes out somewhat less - about 20% or so. depending on the ohms of each speaker and how you wire them - series, parallel or series/parallel will result in the impedance (ohms) of the cabinet which needs to match the amp.
do you have a link where i can find this? :p so i have a clear view how it looks like :)
Awesome. Tnx.:)
Nice
what do you suggest for a 4x12? i gonna make my own cabinets :p
Why would you want to?? There are so many GOOD 4x12 cabs out there, new AND used.
muy bueno!!
Could someone explain what a frequency amp is? I cant seem to find any information on them?
You've asked a physics electronics question and may not find the answer on You Tube, Google it, it would honestly take to long to answer here, you may find it in Wikipedia also.
Gustavo Castillo What he is referring to is actually called an audio frequency signal generator.
No, you are quite wrong sir, a signal generator is one thing but the question he asked likely unknowingly is just what I stated it is, a physics question I don't have time to answer fully; the generator is an electronics machine to insert a signal to find where in the circuit the opposite signal has ended, I have one and use it often.
Jyme Bale To break in new speakers all you do is plug the signal generator into your amp and sweep the audio spectrum over a period of hours, spend more time in the lower frequency range as high frequencies can overheat the voice coil(s) of the speaker(s). I know this to be true.
I did not know that as I've never used one of those for that, good to know if you want to break them before they should be although it seems now a days everyone wants the pre broken in speaker, I would rather do that my self but then you can also have Weber build a broken speaker that distorts far before normal, I have some that do just that and some that do not for clean, thank you for the info.
for those not sure shank = sleeve
Well, ultimately I will throw most of the anachronisms like wire gauges out of the window in favour of reliability and sense. "Made by hand" does not always equate to what people would recognise as "handmade quality"! Popping in a jack parallel to the 1/4", reinforcing the screw locations, etc. would be next. That and modifying the logo to "Mash all". Par for the course I think.
16 ohms and low voltage means low current. lighter wire is not an issue.
I have a tip for you: when screwing the back, I would suggest making sure that the jack is on top and not bottom,
You always have a moron that will walk behind the cab and knock off the ¼ plug thus damaging the entire jack, just mu experience LOL.
all good except for the input jack that jack is junk,its a common marshall input jack and they will fail jack!!!and fast
seems like some small wire your using inside of that
it's standard.....it's worked for decades
"To break in the speakers, just start with 5 watts and work up to 50, then back down." Jesus Christ. Over the course of 30 seconds? an hour? a day? a week? a month? This video gives just enough information that you actually expect to learn a lot, but every time it falls just short so there was no point watching any of it.
That may be so, but that is no reason whatsoever to take the Lord's name in vain.
@@mrmonsoon0001 Man, just wait 'till your 2nd day on the internet.
THE EXTRA OHM WAS FROM SPEAKER CORD.... RESISTANCE AND IMPEDANCE ARE NOT THE SAME. THE 13.5 OHM IS CORRECT FOR A 16 OHM SPEAKER....STUDY ABOUT IT ELSWHERE...NUFF TEXTING ALREADY
Is that solid or stranded wire?
awesome thx :D