Urban Lions Posted May 7, 2015 Share Posted May 7, 2015 I have a trace elliot ah600 (pre Gibson) it has two speaker outputs on the back both a at 4ohms. First question would be if I powered one cab from one output would I be getting 300w @ 4ohms or the full 600w @ 4ohms? If it's 300w each side then if I used a two 1/4 inch jacks to one speak on cable and took both loads would this still be 4ohms or would it go down to 2ohms? My cab is 1000w @ 4ohms Quote Link to comment Share on other sites More sharing options...
HowieBass Posted May 8, 2015 Share Posted May 8, 2015 (edited) I'm pretty certain this is a bad idea - AFAIK wiring two outputs together trying to feed a single cabinet means each output can see the other and you never want that to happen. I'm not familiar with the AH600 head but a quick Google suggests it outputs 600 watts into a 4 ohm load so you just run one output into your cab to get the full power of 600 watts - the 4ohm thing on the back of the head will be the minimum load (so you could run 2 cabs each 8 ohm from both outputs or 1 cab of 4 ohms from one output). Edited May 8, 2015 by HowieBass Quote Link to comment Share on other sites More sharing options...
chris_b Posted May 8, 2015 Share Posted May 8, 2015 Your amp can run 1 8 ohm cab (@ approx 300 watts), or 2 8 ohm cabs (@ 600 watts split evenly between them), or 1 4 ohm cab (@ 600 watts going to it). There are no "sides". It is 1 amp of 600 watts at 4 ohms. These totals are "maximum" ratings and you probably wouldn't get near to them in real life. http://www.traceelliot.com/bassamps/?item=116929 Quote Link to comment Share on other sites More sharing options...
xgsjx Posted May 8, 2015 Share Posted May 8, 2015 [quote name='Urban Lions' timestamp='1431042824' post='2767345'] I have a..... If it's 300w each side then if I used a two 1/4 inch jacks to one speak on cable and took both loads would this still be 4ohms or would it go down to 2ohms? [/quote] It would probably go boom. At very least become a smoke machine. The "Impedance" thread at the top of this forum section is a worthwhile read, but what Chris said above is spot on. If you plug your 4 ohm cab into the amp with a single cable, the amp is going to be running at 4 ohms. If you plug a 2nd cab in, then you're going to lower the ohms which in turn makes your amp work harder & greatly increases the chances of it burning out. Quote Link to comment Share on other sites More sharing options...
Merton Posted May 8, 2015 Share Posted May 8, 2015 Urban Lions - you say this is pre-Gibson, but is this the AH600-12 SMX or AH600-7 SM amp? If the 12-band EQ SMX range I *think* it's 2x 300W amps, each capable of a 4 ohm min load. If it's the 7-band SM range it's one 600W amp, capable of 4 ohms min. Quote Link to comment Share on other sites More sharing options...
Urban Lions Posted May 8, 2015 Author Share Posted May 8, 2015 Hi everyone thanks for your help. It's a ah600gp7sm there are 2 speaker outputs on the back both say 4ohm each. Quote Link to comment Share on other sites More sharing options...
Merton Posted May 9, 2015 Share Posted May 9, 2015 Ok so that's a single 600W stage, you can run one 4 ohm cab, or one or two 8 ohm cabs. Do not run two 4 ohm cabs because the amp will fry. As for your BFC, if it's been rewired to 4 ohm then you're fine but you'll need to check this as per OBBM's comments in you other thread Quote Link to comment Share on other sites More sharing options...
JTUK Posted May 9, 2015 Share Posted May 9, 2015 [quote name='Urban Lions' timestamp='1431042824' post='2767345'] I have a trace elliot ah600 (pre Gibson) it has two speaker outputs on the back both a at 4ohms. First question would be if I powered one cab from one output would I be getting 300w @ 4ohms or the full 600w @ 4ohms? [b]If it's 300w each side then if I used a two 1/4 inch jacks to one speak on cable and took both loads would this still be 4ohms or would it go down to 2ohms?[/b] My cab is 1000w @ 4ohms [/quote] You can't do that.... and shouldn't and don't need to anyway, You have 600w out into 4... you have a 1000w cab at 4.. your amp will deliver its full power off one output socket..simple. No point splitting the signal as it is still a mono signal out Quote Link to comment Share on other sites More sharing options...
Urban Lions Posted May 9, 2015 Author Share Posted May 9, 2015 Thanks guys that's great advice. I just wasn't sure if I would get 600 from a single output. Merton the BFC is 4ohm it says it on the back of the cab. Quote Link to comment Share on other sites More sharing options...
Merton Posted May 9, 2015 Share Posted May 9, 2015 The BFC in standard wiring isn't "just" 4 ohm. It's split into stereo tops (two 2x10s) and a single 15 bottom, as per OBBM's post in your other thread. Unless it's been rewired Quote Link to comment Share on other sites More sharing options...
Urban Lions Posted May 11, 2015 Author Share Posted May 11, 2015 Merton it says on the back of the cab that each set of speakers are 4ohms. I have a photo of the set up how do I post on here? Quote Link to comment Share on other sites More sharing options...
xgsjx Posted May 11, 2015 Share Posted May 11, 2015 Best way to post photos is to put it on a photo sharing site & copy the BB code & paste it here. Flickr is relatively easy to use for that. Quote Link to comment Share on other sites More sharing options...
Merton Posted May 12, 2015 Share Posted May 12, 2015 [quote name='Urban Lions' timestamp='1431329015' post='2769921'] Merton it says on the back of the cab that each set of speakers are 4ohms. I have a photo of the set up how do I post on here? [/quote] If each set of speakers is 4 ohm then the can isn't 4 ohm total... See http://basschat.co.uk/topic/169865-trace-elliot-bfc-1000w-bass-cab-for-sale/ Same plate on yours I assume? If so then check OBBM's wiring diagram on your thread http://basschat.co.uk/topic/259847-advice-needed-on-how-to-power-a-trace-elliot-bfc-please/page__fromsearch__1 because it explains all Quote Link to comment Share on other sites More sharing options...
Guest bassman7755 Posted May 19, 2015 Share Posted May 19, 2015 (edited) [quote name='Urban Lions' timestamp='1431042824' post='2767345'] If it's 300w each side then if I used a two 1/4 inch jacks to one speak on cable and took both loads would this still be 4ohms or would it go down to 2ohms? My cab is 1000w @ 4ohms [/quote] Its not "300 W a side" its a single 600W amp with parallel outputs, the only reason it has two jacks is as a convenience measure to allow you to plug 2 8 ohm speakers in (which would be run in parallel giving 4 ohm). Just plug your speaker in and go. Edited May 19, 2015 by bassman7755 Quote Link to comment Share on other sites More sharing options...
Urban Lions Posted May 20, 2015 Author Share Posted May 20, 2015 Yep same plate. Quote Link to comment Share on other sites More sharing options...
Francis Pettifer Posted May 20, 2015 Share Posted May 20, 2015 The ah600 features 2 300 watt power amps in one case. Each amp will deliver 300watts rms into a 4 ohm load.. Under no circumstances should the 2 amplifier outputs be connected together. Each output is designed to drive an individual speaker enclosure. It is quite feasible for each output to easily drive 2 8 ohm cabinets wired in parallel, hence 4 ohms to each channel. Therefore you can drive up to 4! 8 ohm speakers in this way. If you activate the built in electronic crossover, the left hand Chanel drives the low frequency cabs, and the right hand channel drives the higher frequency cabs. Do this, and your on stage sound will be fantastic. I've owned one since 1993, and they are a totally brilliant amp, particularly if fronted by the gp12smx per amp. Quote Link to comment Share on other sites More sharing options...
obbm Posted May 20, 2015 Share Posted May 20, 2015 OP, is your AH600SM covered in black vinyl or green carpet because according to the Trace brochures that I have the two versions are indeed different? Quote Link to comment Share on other sites More sharing options...
Merton Posted May 21, 2015 Share Posted May 21, 2015 [quote name='Francis Pettifer' timestamp='1432158151' post='2778806'] The ah600 features 2 300 watt power amps in one case. Each amp will deliver 300watts rms into a 4 ohm load.. Under no circumstances should the 2 amplifier outputs be connected together. Each output is designed to drive an individual speaker enclosure. It is quite feasible for each output to easily drive 2 8 ohm cabinets wired in parallel, hence 4 ohms to each channel. Therefore you can drive up to 4! 8 ohm speakers in this way. If you activate the built in electronic crossover, the left hand Chanel drives the low frequency cabs, and the right hand channel drives the higher frequency cabs. Do this, and your on stage sound will be fantastic. I've owned one since 1993, and they are a totally brilliant amp, particularly if fronted by the gp12smx per amp. [/quote] That's the 12 band head - the OP has the 7 band head which is a mono 600W head. Quote Link to comment Share on other sites More sharing options...
obbm Posted May 21, 2015 Share Posted May 21, 2015 [quote name='Merton' timestamp='1432191627' post='2778952'] That's the 12 band head - the OP has the 7 band head which is a mono 600W head. [/quote] Not according to my collection of Trace brochures Martin. They are both shown as being 2-channel 300-watt + 300-watt. Quote Link to comment Share on other sites More sharing options...
Merton Posted May 21, 2015 Share Posted May 21, 2015 [quote name='obbm' timestamp='1432200127' post='2779041'] Not according to my collection of Trace brochures Martin. They are both shown as being 2-channel 300-watt + 300-watt. [/quote] Oh, fair enough. I was only aware of the mono 7-band version Quote Link to comment Share on other sites More sharing options...
Ghost_Bass Posted May 21, 2015 Share Posted May 21, 2015 OP, just post some pictures of your amp and cab and we'll get this sorted quickly! Quote Link to comment Share on other sites More sharing options...
Merton Posted May 21, 2015 Share Posted May 21, 2015 Daft idea Quote Link to comment Share on other sites More sharing options...
Urban Lions Posted June 7, 2015 Author Share Posted June 7, 2015 Hi guys, sorry I've only just picked up on this. The head is covered in the fury carpet stuff. It's the GP7 SM bass pre amp AH600SM it has a blue neon light, it's very heavy and fat. Quote Link to comment Share on other sites More sharing options...
obbm Posted June 7, 2015 Share Posted June 7, 2015 So it's one of these then: Quote Link to comment Share on other sites More sharing options...
Urban Lions Posted June 9, 2015 Author Share Posted June 9, 2015 Yes I think it is Quote Link to comment Share on other sites More sharing options...
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