la bam

Evening all. Just a quick question - does anyone know the exact eq setting for total flat response on a markbass LMIII? The reason i ask is ive come pretty close i think. Im going to be running a dual set up - tech 21 vtrm to desk, and then into the LMIII, so i want it as flat as possible. The setting i have are around - LOW 1-2oclock. MID 11oclock HIGH 1-2oclock. With those settings it seems to be pretty transparent - getting the same sound to desk and cab.

Thanks to all who helped on this. Ive spoken to QSC themselves today, just querying their manual that clearly shows bridge operation being fine into 1 cab at 4ohm or greater. After speaking to them it should show that (as said above) its a 4ohm LOAD not CAB that it should show. As such, paranoia has set in, so im not going to go down this route anymore. Hence the QSC amp and x2 bridge cables will be going up for sale. On the plus side - i now have a better idea of how bridging works at last!

I genuinely think it's a split between what you play on the day and the instant chemistry you strike with the band - and you can't prepare for that. I don't believe the 'best' player always gets the job. Just prepare the best you can - and what will be will be.

From his point of view, he wants to buy the bass, so will have a bundle of cash on him, but you want to meet somewhere thats not your house, and drive him somewhere he doesnt know where hes going or who with - so he could be feeling the same? As well as that - I wouldnt take a deposit to be honest - youve no proof what that £20 is for. Id just say its a case of first come first served. He can wait as long as he likes but if it sells in the meantime, its their loss. I tend to feel the differently whether im buying or selling nowadays.

I think it is slowing down, but I think that's too do with all the manufacturers supplying consistently good products for little money. There's so many good lightweight amps and multi fx pedals out there. I've had a Mark bassv evo 1 up (and still have). It contains x2 channels, mixable channels, 500w, x2 Di's, USB to PC, tuner, envelope filter, over drive, compressor, chorus, delay AND high end models of ampegs, fenders, swr, trace, sunn, gk, mb, and more SND it's only 3kg - basically everything your ever need. And can't move it at £450.

Sorry (i know im being a pain - it will sink in i promise), but ive gone into confused mode again.... The QSC manual quotes: https://www.qsc.com/resource-files/productresources/amp/discontinued/rmx/q_amp_rmx_series2ru_usermanual.pdf "Bridged mono mode combines the power of both amp channels into one speaker, resulting in twice the voltage swing, four times the peak power, and approximately three times the sustained power of a single channel. This mode uses Channel 1's input, gain control, input filter, and clip limiter; Channel 2's should not be used. WHEN TO USE IT (OR NOT) Use bridged mono to deliver the power of both channels to a single 8- or 4-ohm load. Set switch positions 6 and 7 to "BRIDGE MONO ON." Use Channel 1's inputs, and connect the speaker as shown." There is also a picture on page 21 of a guitar set up showing everything fine in bridged mode with one cab as long as its >4ohm, which my 6ohm cab would be?

Thanks, I think it's becoming clearer. So, by running in bridge mode, each channel is giving 600w at 3ohm, but overall that's 1200w at 6ohm, which is perfectly safe to run at?

Thanks all. I dont know where i got the information that running in bridged halves/doubles the ohmage the amp runs at, but its a relief to hear just to treat it as one amp. Thanks.

ah, that is perfect.

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So, if im right, will it run at 6ohm, or x2 lots of 6ohm (as its bridged) so 6/2 = 3ohm? (as im only using x1 cab).

This is where i get confused...... If the QSC spec is 4ohm bridged giving 1400w, then using my 6 ohm cab will draw approx 1000w - is this correct? Completely confused now though for some reason i thought running in bridged mode doubled/halved (depending on how you look at it) the ohmage - so instead of 6ohm in one channel of stereo, it would use 3ohm, as both channels are being used? Any clarity appreciated!

no problem (ive probably not described it properly). Im wondering what ohmage the power amp will be running at, when running in bridged mode, if using a 6ohm cab, and what output in watts that would be giving. Would it be 3ohms (as the amp is bridged)? Rather than 6ohm in normal / stereo mode?

for me - i love it. they really do sound like led zep making new music (albeit in an old style). i cant believe people think theyve no, or even a slight resemblence to led zep - i think theyre EXACTLY like led zep. they vocal style, phrasing, drum sound, guitar playing - its as if theyve done a degree in playing like led zep. good to hear some decent rock for the first time in a while. whether thats a reflection of how good greta van fleet are, or how bad the current scene is, im not sure.

Hi all, With so many different threads on "what would my ohmage be...?" and with a bit of confirmation needed, I thought it might be an idea to have a thread where we could put everything in one thread, also so others can reference and understand. Im sure a lot understand, but also a lot don't. Theres also different set ups, amp set ups and cab configurations. So, i'll start with...... Cab - Markbass 6x10 900w runs at 6ohms. Amp - QSC RMX1450. What will my ohmage be, running this amp in bridged mode? And is there any problem with that?

Luckily never during a gig, but I did have a mag300 break a week or two into buying it new, years ago, so it's always a good idea to have a back up just in case. I have had a cable go on me. First song of first set. Worked perfect in sound check. So I now always have, spare bass, spare tuner, spare cable and spare amp on top of my main amp.

whoa! i didnt even know they were over here on tour?

They ARE different though! A dedicated bass head say off 500w RMS will give all its power out of one output - 500w with a 4Ohm cab, and approx 250w with an 8ohm cab....and thats pretty much that. A dedicated power amp (take the QSC 1450) will work in 2 different ways. It will give its output out of 2 outputs - 500w per channel with a 4 ohm cab, apprx 250w per channel with an 8ohm cab.....thats if you are using a standatrd speakon cable with the amp in stereo mode. So as you can only use one channel (if youre using one cab), thats all you will get - between 250-500w. BUT, flick it to bridged mode, and use a dedicated (wired differently) speakon cable and youll get approx DOUBLE that from one channel - channel A.So youre now at approx 1000w with a 40hm cab and 500w with an 8ohm cab with all that coming from just the one output. Thats how if you think youre using a 2000w power amp with a 200w cab, I actually think youre probably using it in stereo mode at 250-500w output. I might be wrong though, but some people dont understand how power amps work differently from designated bass guitar ones. Hopefully the above shows how you can get approx double the output from the same channel, depending on how you actually set the amp up. In theory, the difference could be huge - using an 8ohm cab in stereo mode the amp would give a max of 250w, using a 4ohm cab in bridged mode could give you 4 times the power at 1000w - all from the same amp. So it isnt just the volume dial of the power amp you have to take into consideration.

sorry, i meant the power amp he was referring to, not the bugera. I use a QSC 1450rmx and regularly adjust its settings and cables to the cab im using at that time. Just explaining that plugging into a power amp, can be a different game to plugging in to a designated bass amp.