Billion amp questions

[LeDbOx]

can someone please clear up the whole ohms and watts thing. i have a GK head reated at 300watts at 4ohms

http://www.musiciansfriend.com/product/Bass/Amps?sku=482534

and a hartke transporter cab rated at 300watts @ 8ohms

http://www.samash.com/catalog/showitem.asp?ItemPos=2&TempID=3&STRID=212845&Method=3&CategoryID=138&BrandID=1373&PriceRangeID=0&PageNum=0&DepartmentID=2&pagesize=10&SortMethod=3&SearchPhrase=&Contains=&Search_Type=Department&GroupCode=

can i add another 410 (same ohms watts). will that decrease my overall volume? will it reduce cliping? sry if i forgot any details but plz help me pull my head out of my arse

[Son of Magni]

E=IxR

[LeDbOx]

was that an answer?

[Muggsy]

With ohms 16+16=8, 8+8+4, 4+4=2, your head pushes 300 watts when either 1 4 ohm cab or 2 8 ohm cabs are being run by it.

[Son of Magni]

voltage = current x resistance
watts = current x volts

any particular amp has fixed maximum voltage and maximum power (watts).

[LeDbOx]

sry im thick headed but if i ad another cab volume should be relative to what it is now thnx for help btw

[Muggsy]

If im not mistaken it should be louder actually, and besides more speakers equal more volume because it pushes more air. Watts dont really directly relate to loudness.

[Son of Magni]

I sorry, I have the annoying habit of trying to get people to think :p (seriously, my problem, not yours...)

If you have a head rated: 50 watts @ 8 ohms, 100 watts @ 4 ohms...
If you are running an 8 ohm cab, you can only get 50 watts out of the head. If you add another 8 ohm cab then you will be running at 4 ohms and will get 100 watts out of the head. Every time you double the watts you get 3db increase if maximum volume.

The voltage "rails" of your head are a constant and are the limiting factor of the power you can get from the head. E=IR, so if your head runs at 50 volts (E), and you have an 8 ohm speaker, the most current you can draw is 6 amps (50=6x8 roughly). Watts(power) = amps x volts, so 6 x 50, you have peak power of 300 watts. RMS (average) power would be about 160 watts. If you add another 8 ohm speaker in parallel, the 8 ohms becomes 4 ohms, and the power is doubled, hence another 3db available.