#1
Okay, here's the deal I can get occasionaly 2x 2x12cabs, but i'm not sure if my amp wouldn't blown speakers or something (don't know much about wattage matching), so here's my questions, will this setups work okay ?
1. 15w PA + 50w cab (2x25w)
2. 15w PA + 150w cab (2x75w)
3. 50w PA + 50w cab (2x25w)
4. 50w PA + 150w cab (2x75w)

Any of theese setups would be dangerous ?
#2
Either you are typing on a cell phone or English is not your first language.

You didn't tell us anything about your amp.

We would need to know a little more about this set up too. What kind of PA? Are you using microphones? Is the PA for everything or just your amp? Are you mic'ing up your amp? What size venue? What kind of amp is it? etc.

Most amps (read Valve amps for guitar) are not meant to drive PA speakers. They are meant to drive guitar speakers.

I think.

I don't gig.

Free bump.
#3
PA : MG 2x50w full tube guitar power amp with reduction to 2x15w connected to ADA-MP1 / Marshall JMP-1 preamp
Cabs : 2x25w celestion G12M ; 2x75w eminence v125
#4
Dude you're making it way too confusing, but I think I see what you're saying. You have a modular premap/power amp setup with an attenuator right? If you've got 2x50w power amps you're probably looking at about a 150W cab at 16ohms, so a 2x12 with 2x75W celestions should be fine. Just make sure your impedance matches.
#5
Jeez i rly don't know what's not clear here, I have simple rack set, no atenuators or whatever it is :
- 1x Guitar full tube Power Amp (local firm MG, proffesionally handmade, based on Mesa) with separate 2 channels 50watt each with reduction on 15wat each
- Preamp Marshall JMP-1 / ADA-MP1

And i Need cabinets for that gear, which I can occasionaly buy ONLY IN PAIR :
- 2x12 Celestion Greenback 25w each (50w both); 8 ohm
- 2x12 Eminence Legend 125 75w each (150w both); 8 ohm

My question is, if this cabinets would work fine with each of power amp wattage setup :
1. 50w tube PA + preamp + cabinet 2x12 Greenbacks (2x25w)
2. 50w tube PA + preamp + cabinet 2x12 Legends (2x75w)
3. (reduced) 15w tube PA + preamp + cabinet 2x12 Greenbacks (2x25w)
4. (reduced) 15w tube PA + preamp + cabinet 2x12 Legends (2x75w)

I'm almost sure that 2/3/4 is all okay, but i'm just not sure if 1st option is safe and won't kill speakers or something.
I know to plug in same ohm .....
#6
You say 50W but it's stereo - so 50W per side or 50W total?
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#7
Quote by stratomaster90
Jeez i rly don't know what's not clear here,......blah bla blah

Seriously?

You are the one that needs help not us. Be lucky we even popped in and tried to help. Your shit is still confusing.

Good luck
#8
Quote by 311ZOSOVHJH
Seriously?

You are the one that needs help not us. Be lucky we even popped in and tried to help. Your shit is still confusing.

Good luck


Yea You didn't exactly helped or tried to help, so i don't know why You even replied if You havn't anything quality to say.


Yes it's 2 channel, 50w per channel, which can be reduced to 15w per channel (like old Mesa 50/50).
I always heard that safer is get a cab like 2x more wattage than amp, so I'm wondering if the 2x25w Greenbacks cab plugged to 50w tube amp won't hurt spekears etc
I'm carefully becouse I rly wish not to kill 78;79 g12m blackbacks.
#9
Why should we help you if you're being a jerk to us?
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NakedInTheRain aka "Naked with shriveled pencil sized bacon In The Rain"
#10
There's normally a bit of leeway with speakers so matching power is usually pretty safe. Do you ever dime the power amp anyway? That's the only times it's producing the full rated power.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#11
Go with the eminence cab(s), I prefer them with most Marshall type amps over the Greenback's. That being said, the Eminence speakers are more versatile than the Greenbacks, but if you like the Greenback tone then go with that.
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate
#12
Okay, that's what I needed to know, thanks Cathbard.
I'm very rare using 50w mode (only on gigs) and never turned volume more than 2/3, but wanted to make sure. It wouldn't be (or maybe it would be) funny if speakers would blown on gig.

* Like I wrote - it's occasionally, I wanted to get this 2x12 Eminence 125 (not v125 my bad sry), but the guy offered me REALLY nice discount if I also get 2x12 Greenback (i think he doesn't know that 78;79 Blackbacks are quite rare expensive stuff).
So wanted to make sure if I would be able to use them safe with my amp.
Last edited by stratomaster90 at Jun 28, 2013,
#13
You are talking about the Eminence V128 right you typed v125?
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate