Ghost_Bass

[quote name='thebrig' post='1047579' date='Dec 4 2010, 05:42 PM']Which set-up would sound better, and which would be the loudest?[/quote]

Theoreticly speaking both rigs will be equaly louder because the amp will split it's 600W sending 300 to each cab but in the real world you will get a little more volume (or the fealing of having it) with the 210 because it will be able to move a bit more air than the 12.
As for better sounding... you must be joking! We're talking about Genz Benz, not Fame or Harley Benton... both rigs will sound amazing!!! The question is wich one will have a timbre more adequate to your taste and that only you can find out going to a store and trying both.

Cheers

It's great to hear that you're happy with your gear. Enjoy it!

I use mine (korg PB) first place (bass-tuner-fx-amp) so i can mute the signal to the entire rig after sond check or during intervals and unplug the chord from my bass so it doesn't waste battery.

[quote name='dannybuoy' post='1043089' date='Nov 30 2010, 10:45 PM']Haven't had time I'm afraid! The new knob does not affect the sound in bypass mode.[/quote]

Great i'm going for that mod. Thank you for sharing this.

Any clips yet?

edit: just another Q. The master volume pot doesn't work in bypass or does it?
Cheers

[quote name='jonthebass' post='1042185' date='Nov 30 2010, 12:02 PM']Looks like the Audio Kitchen 'Base Chopper' to me:
[url="http://www.audiokitchen.co.uk/"]http://www.audiokitchen.co.uk/[/url]

edit: beaten to it by Ghost_Bass![/quote]

I think that´s the Base Chopper:
[url="http://www.audiokitchen.co.uk/"]http://www.audiokitchen.co.uk/[/url]

Cheers

[quote name='Mr. Foxen' post='1041277' date='Nov 29 2010, 03:35 PM']Top one is closer to ear height for the mids/highs. Acoustic coupling will mostly affect lows, and lows are affected by loads of other room effects. Since most of the 'sound' is in the mids, that would be a more signifcant factor to perception.[/quote]

I see your point and you're most certainly right but i used to play with a TE stack (300W head+2x10H+1x15 - it's not the same situation, i know) and when i went from using the single 15 to the full stack i didn't find much increase in volume. In fact i only lowered my volume pot from 3.5/10 to 3/10 - i know! TE's volume pots aren't linear... - i don't think it would be such a small difference if some external factor wasn't kicking in!...

[quote name='51m0n' post='1041217' date='Nov 29 2010, 02:41 PM']No way can you get more power from a single amp running into a single cab than same amp running into two of the same cab, impedance just doesnt work like that chaps![/quote]

If you're writting this because of my post then you didn't understand me. What i tried to say is that (if you don't touch the head settings or volume) when you connect one single cab it'll get a certain amount of signal (let's call it S). When you connect another cab, lowering the impedance, the signal from the amp will be bigger than "S" like BFM explained but this signal equaly divided to both cabs will be less than "S" in each cab. But adding to this we have the floor coupling fenomena happening, the higher a cab is more coupling you have.

So [b]my theory[/b] (feel free to correct me on this, í'm here to learn ) is:

[u]With two identical cabs, stacked, with the same setting on the amp (this includes the volume knob being untouched) we have[/u]:

- Two cabs running at the same time will have more volume than each of them soloed;
- The bottom cab running solo will have more than half of the the volume of two cabs;
- The top cab running solo will have less than half of the the volume of two cabs;

My main variable is floor coupling.
If anybody with knowledge could do the math with a simple example to try and find if i'm very far from the truth i'll appreciate.

Cheers

Using just one cab the amp (set at the same volume) will put out a little more in that cab than having to split the signal in two cabs (the same way we say a amp is 180W@8ohm / 300W@4ohm for full power... don't know the techs on this... but i think you get my point). Adding to this you used the bottom cab alone who benefits of floor coupling.

So, if we see this in perspective we have two situations:

A - Both cabs running - each will recieve less signal than a single one.
B - Bottom cab running solo - the cab will recieve an increase in signal and the floor coupling will increase in the same progression thus giving the feeling of having almost the same volume of two cabs.

You may find interesting next time you're in a reharsal to try with the top cab running solo. I believe you'll then notice a big drop in volume. Try to A-B all the possibilities (two cabs vs top cab vs bottom cab) if you find the time and post your results. It'll be an interesting expirience and we'll all learn something mores about cab placement and coupling

Cheers

edit: correction of my portuglish...

Why don't you cut a piece of plywood to your suited measure, cover it with carpet and stick velcro on the pedals and power supply. Then just transport it in the best fit toolcase you can find!

I think this one would be the best for you:
[url="http://www.dv247.com/studio-equipment/behringer-ultra-di-di20-2-channel-di-splitter-box--4662"]http://www.dv247.com/studio-equipment/behr...itter-box--4662[/url]

If you use the "link" option you connect your bass to the Jack CH1 input and connect both balanced out's (CH1 and CH2) to the balanced channel inputs in your Peavey mixer and in the FOH mixer!

A simple solution for not much more than £20

[quote]Amplifiers don't put out ohms. They put out Watts into a load which is specified in Ohms. An amplifier has a minimum load into which it will deliver its maximum specified power.

Trace amps, and the majority of other makes of amp, have a minimum load of 4-ohms which can be made up of any number of cabs as long as the total impedance does not go lower than 4-ohms. A Trace amp can have 2 x 8-ohm loads which happens to be 4-ohms.

In many cases where there are two speaker output sockets they are labelled 8-ohms each so that dumbos don't stick 2x 4-ohm cabs onto it and see magic smoke.[/quote]

You're right about the ohm explanation and i know that but i didn't read properly what i wrote before posting.
As for that 2x8ohm... of course trace amps can take a 2x8ohm load! My reply to Prime_Bass had to do with him saying to look out as some amps have 2 separate outputs each running into a min load of 8ohm!

[quote name='JMT3781' post='1037406' date='Nov 26 2010, 09:10 AM']you are completely right

my suggestion was just in case the OP didn't want to buy anything else... so here we have one of those wonderful situation where we are both right.

Hoorah![/quote]

Does one of these work for you?

It's from Boss.

[quote name='JMT3781' post='1037086' date='Nov 25 2010, 10:40 PM']or if you powered mixer has an output marked aux or monitor, use that, just like running out to a powered monitor. Just make sure its an unpowered send, otherwise stuff will get hot very quickly..[/quote]

You're very right and would be the cheapest way to deal the problem however it implies plugging the bass directly to the mixer... i don't understand the science around mixers inputs and impedances but from what i've been hearing and reading all these years the majority of prople say it's always preferable to send a balanced signal to a mixer. Having said that, i've plugged my bass direcly to the mixer (to a insert input - mono Jack) a lot of times for lack of balanced channels and it sounded just fine. When i DI to a balanced channel i get the feeling that the sound gets tidier anf a bit fuller... maybe not the best words to describe it... laking a bit of english vocabulary in this one!

Hey! We're talking about a trace head! I'm sure there won't be any lack of power to the cabs coming from it!

Trace gear puts out 4 ohm and not 2x8ohm. It's true that with 2 cabs with different ohmage the output isn't going to be the same for both, the 8 ohm cab will be a tad louder - can't do the math to tell how much louder, maybe someone can help on this?

[quote name='Mog' post='1036220' date='Nov 25 2010, 12:33 PM']A bit more managable for a 1x12 then.[/quote]

The hard part is to find 1x12"ers capable of handling that power (can't remember more that Markbass cabs or the Barefaced Midget T, both 600W@8ohm).
I'm going to use a STL-12T (300W) cab with my arriving 9.0 but i'm aware of the risks.

[quote name='StevieD_FenderP2009' post='1036239' date='Nov 25 2010, 12:44 PM']Ok, I was wrong, it's not how I thought it was at all haha
Well, I give up trying to understand impedance. Cheers for your diagrams though Jon! They do look very helpful.

Right, so back to the question at hand, AM I GOING TO KILL MYSELF/MYAMP/MY CABS? haha

Cheers
Stevie[/quote]

Based on John's diagrams try to find out your cabs exact impedance. Can't you see how they're linked the same way you saw their model and impedance?

My band lukily reharsals in our drummers garage buildt outside his house and suficiently isolated to not getting complaints from the neighbours. Even there i usualy leave my amp at home and connect my bass to a 300W Laney floor monitor and use a DI to send it to the mixer. It's more than enough quality sound for me (better than many bass amps in the market, believe me!) to make me not bother draging my Trace Elliot 1x15" combo up and down my 2nd floor apartment's stairs.

[quote name='Mog' post='1036174' date='Nov 25 2010, 12:13 PM']900 watts @ 8ohms? why? this micro head thing is turning into a cock measuring contest IMO. sure it fits in a gigbag, but I havent come across too many cabs that can be carted around easily and require that much juice.[/quote]

That was a typo from the TB'r poster. He emended it, it's 500W@8ohm / 900W@4ohm, just like the STL-9.0, in fact they're both equipped with the same class-D power amp

See here:
[url="http://www.drtube.com/marshall.htm"]http://www.drtube.com/marshall.htm[/url]

go to the bottom of the JCM800 Bass series and you'll find what i think may be your cab:
[quote]1935A JCM800, Bass 4x12" 260W/280W 16Ω angled front cabinet.
1935B JCM800, Bass 4x12" 260W/280W 16Ω straight front cabinet.
These cabinets were in production form 1980 up to 1986. They were fitted at first with 4 Celestion G12-65 T3101 16Ω speakers and later (1983 onwards) with 4 "Marshall-Celestion" 12" 16Ω speakers.[/quote]

So it would be a 16ohm cab and not 15ohm.
If the 2x15 is realy 8ohm and this is confirmed to be a 16ohm cab then you're safe to connect both cabs.

[quote name='Musicman20' post='1035950' date='Nov 25 2010, 09:47 AM']If this is basically the Genz version of the MB Walkabout, I can see it selling very well.

We shall see. Despite my initial reactions with a Shuttle 9.0, im tempted by one at the moment.[/quote]

Stop fooling yourself and buy the 9.0 already! You know you want it! And you know that's what is going to happen!

[quote name='dannybuoy' post='1035741' date='Nov 24 2010, 11:03 PM']I would have done if I could figure out how, but it's a fiddly double sided PCB that you can't remove very easily.

Ghostbass -yes, it's just basic master volume control that affects the whole pedal. In dry mode, you adjust the regular volume knob until you're happy with the clean/dirty ratio, then back off the volume a bit with the new knob.

I'll do some samples when I can after my gig tomorrow.[/quote]

Great! I think i'll be gutting mine very soon
Those samples would be much appreciated. If i think i can use it in my band i'll do both mods in one go!

Buy a DI, something like this:

It's cheap. Plug your bass into it then use the link out to connect to the power amp and the DI out to connect to the mixing desk and get rid of that Roland in your setup! That's how i would do it.

Cheers