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Finally settled on a stack - but with questions

#21
This isn't as complicated as you think it is. So I'm just going to clear some things up for you:
If the head is higher powered (in watts) than the cab, it won't wreck the cab, so long as you don't turn it all the way up.

The head will have two outputs, so yes you can connect both to the head and that is parallel.

When you connect two cabs to the head, the head splits the Volume it is putting out into both of the cabs, so in your case with the 300 head 150 watts into each cab, resulting in 300 watts. If you bought the 600 head (575 watts) [I recoment you buy that one, you'll be greatfull later on] and connected two 8 ohm cabs, it would once again put half the power into each cab (282.5 watts into each cab, no it won't blow up the 115 because it is only 250 watts).

Re (the different cab thing): Ashdown have the 114 cab and the 410 cab both have 4x10", but I'm not too sure what the difference is, i think one of them may be deeper?



Last thing, make sure you try out the amp your getting, I mostly know all this stuff because I had planned on getting the 600 Head with 410 cab and did ********* of reasearch, went into a store tried it out, and ended up putting a deposit on a marshall rig (MB450 & MBC 410).


Correcting Andy Martin; the head is 575 watts into 8 ohms, not 4 ohms
 
#22
When you connect two cabs to the head, the head splits the Volume it is putting out into both of the cabs, so in your case with the 300 head 150 watts into each cab, resulting in 300 watts. If you bought the 600 head (575 watts) [I recoment you buy that one, you'll be greatfull later on] and connected two 8 ohm cabs, it would once again put half the power into each cab (282.5 watts into each cab, no it won't blow up the 115 because it is only 250 watts).
Click to expand...

thanks, that clears up loads. but what happens if you connect one speaker to the head, and then the other speaker to the speaker already in place? what happens to the wattage?

i promise you this will be the last question!

thanks so much
 
#23
tom once dead said:
Last thing, make sure you try out the amp your getting, I mostly know all this stuff because I had planned on getting the 600 Head with 410 cab and did ********* of reasearch, went into a store tried it out, and ended up putting a deposit on a marshall rig (MB450 & MBC 410).
Click to expand...

I looked up the Marshall head, 4x10 cab and 1x15 cab, and it works out to be around the same as the ashdown. I'll have to try out both. may i ask why you prefered the marshall?
 
#25
ah i see. is there any way to connect them in parrallel, so that they each receive 307W? because if the wattage is split, doesnt that mean they are connected in series?
ok, so say the current does split. that means that the 4x10 cab is getting 150W, and so is the 1x15 cab.
With the 4x10 cab, each speaker is getting 150W, so all 4 speakers are putting out 600W, plus the 1x15 cab = 750 realistic watts in total.

its like a simple circuit with a battery and 2 light bulbs. if the bulbs are connected next to eachother in series, they will share half the battery each and glow dimmer, but if they are connected in parallel, the battery would drain faster because it is providing maximum current to each bulbs. but since the head is plugged into the mains, you dont have to worry about the battery draining.
 
#26
Yes you can connect them in parallel so that they each receive 307w. You just need to buy a 614w amp:D

The maximum output of the amp is 307w so whatever it outputs is distributed evenly between your cabs, provided they are all the same resistance. You cannot connect them in series without making up a special lead so don't worry about that. If the 4x10 is getting 150w, that will be distributed evenly between each driver, so each driver will be getting 37.5w

It's difficult to explain series/parallel without drawing it. Have a look at this

Link Removed

and also have a look at this

http://basschat.co.uk/index.php?

which is a UK based forum. Not that there is anything wrong with the excellent Talkbass but you may find a UK forum more useful for some things
 
#27
thanks that article helped a lot. i think ive made up my mind.
i think i'll buy the:
Ashdown MAG 300H EVO II Head
Ashdown MAG 410T Deep Cabinet
Ashdown MAG 115 Deep Cabinet

I was possibly planning on buying the 575W head instead of the 307W one, but after reading the article - Quote:
"The exact power rating required for the speakers depends on the speaker design, but as a general rule of thumb it is advisable to use speakers that can handle more power than the amplifier can produce – around 50% more is a good starting point (see NOTE below).

This means that for an amplifier rated at 400 Watts RMS it is advisable to use speakers rated at 600 Watts or more. This will give you a lot of clean headroom (i.e. the speakers will not distort when the amplifier is operating near full power) and allows a safety margin to prevent peaks in the amplifier signal from exceeding the power capability of the speakers."

307W seems much more 'safe', and im sure with 2 cabs it will be loud enough for a rock band. Phew glad i finally made up my mind!

Thanks for all your help guys
 

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