Adding speaker to rig - need ohm / wattage advice please

[MuddBass]

Hi All,

I Currently have a Genz Benz Rig - a GBE 600 head paired to a 212 Neox Cabinet.

The head is rated at:

8 ohms - 275 watts
4 ohms - 425 watts
2 ohms - 625 watts

The 212 cabinet is 4 ohms (upto 600 watts).

[u][b]MY QUESTION:[/b][/u]

If I add a 112 Neox cabinet (8 ohm 300watt) to the rig, will the head cope? Also, if I cranked the head up full, would the 212 stop the 112 from being overloaded

Any advice gratefully recieved,

Greg

[xgsjx]

The Ωs would be 2.6, so the amp should be fine & there should be a fairly even spread over all 3 drivers. So yeah, should be fine. Ears are good for saying otherwise though.

[warwickhunt]

If the head can do 2/4/8 ohm loads then you have no problem with the amp (the load will be between 2-4 ohms). The 2x12 won't have any affect on the 1x12 load as such but sensitivity dependent one might be working harder than the other, in which case use your ears!

[warwickhunt]

DOH! Slow at typing/responding. [size=4] [/size]

[MuddBass]

[quote name='xgsjx' timestamp='1384975051' post='2283044']
The Ωs would be 2.6, so the amp should be fine & there should be a fairly even spread over all 3 drivers. So yeah, should be fine. Ears are good for saying otherwise though.
[/quote]

Thanks for this, this it what I was hoping for. I was worried that potentially I'd could have been pushing too much of the 600 watts through the 300 watt cabinet.

[xgsjx]

Each driver probably won't get close to 200w each if you get to full whack.

[Lozz196]

Each cab will get approx 312 watts so the twelves in the 212 will each get approx 160 watts, whereas the single will be getting the full 312 - assuming you run the amp at full pelt which I`d very much doubt. Keep a close ear on it and if the 112 struggles back off on some lows.

[LiamPodmore]

[quote name='Lozz196' timestamp='1384989155' post='2283331']
Each cab will get approx 312 watts so the twelves in the 212 will each get approx 160 watts, whereas the single will be getting the full 312 - assuming you run the amp at full pelt which I`d very much doubt. Keep a close ear on it and if the 112 struggles back off on some lows.
[/quote]

Normally Lozz would be right, if the cabs were matching resistance, but because the 2x12 is 4 ohms and the 1x12 is only 8, it'll be evenly spread, all getting somewhere around 150/160w. You should be fine with them, just use your ears and check for any signs of one being pushed too hard, as has already been mentioned.

Liam

[Lozz196]

Yeah of course, dur! Didn`t read that part properly.

[chris_b]

I do this as well.

I have a 2 ohm amp and run a 4 ohm 212 and an 8 ohm 112. Everything works well and as designed.

[icastle]

Here's a handy little tool for working out this sort of thing:

http://ampservice.de/impcalc.php?lang=e

[MuddBass]

[quote name='Lozz196' timestamp='1384989155' post='2283331']
Each cab will get approx 312 watts so the twelves in the 212 will each get approx 160 watts, whereas the single will be getting the full 312 - assuming you run the amp at full pelt which I`d very much doubt. Keep a close ear on it and if the 112 struggles back off on some lows.
[/quote]
[quote name='icastle' timestamp='1384993622' post='2283380']
Here's a handy little tool for working out this sort of thing:

[url="http://ampservice.de/impcalc.php?lang=e"]http://ampservice.de...calc.php?lang=e[/url]
[/quote]
[quote name='chris_b' timestamp='1384990661' post='2283363']
I do this as well.

I have a 2 ohm amp and run a 4 ohm 212 and an 8 ohm 112. Everything works well and as designed.
[/quote]
[quote name='chris_b' timestamp='1384990661' post='2283363']
I do this as well.

I have a 2 ohm amp and run a 4 ohm 212 and an 8 ohm 112. Everything works well and as designed.
[/quote]
[quote name='LiamPodmore' timestamp='1384989977' post='2283351']
Normally Lozz would be right, if the cabs were matching resistance, but because the 2x12 is 4 ohms and the 1x12 is only 8, it'll be evenly spread, all getting somewhere around 150/160w. You should be fine with them, just use your ears and check for any signs of one being pushed too hard, as has already been mentioned.

Liam
[/quote]

Thanks for all your replies - very much appreciated, you're all on my Christmas card list now ;-)

[MuddBass]

I've done it!! Added a 112 to the 212 current rig - sounds (and looks) great! Will use the 112 for smaller gigs with its built-in monitor stand.

Thanks for all your advice - picture attached of rig

[attachment=148966:IMG_00000026.jpg]

[xgsjx]

Looks rather nice that does.

[MuddBass]

[quote name='xgsjx' timestamp='1385132913' post='2284844']
Looks rather nice that does.
[/quote]

Thanks my friend