multiple sub question
 

i am getting infinity refference 10" subs. it will cost me about around 150 bucks more to buy 4 subs and build my own box vs. buying one sub and buying a box. I will wire them 2ser/2par so i can use just one amp. Do you think it would be worth the orth 150 bucks for the 4 subs or should i just stick with the single 10"(which i must add is pretty freakin lough). also any box designes for 4 subs would be greaty appreaitalkgjfg(wish i could spell)

i can get one sub for 90 bucks and i can get 4 subs for 250 bucks. I am going to be using a us acoustics amp(280X1RMS) to power them. I usually only like the single sub idea as well but for just ALITTLE more i can run 4 runs with one amp and have the option of really pumping out some bass. the subs have a 250 rms and a spl of 92. but for the price and quality i can't really complain. More than likely i will only do the single ten unless i have the extra 200 bucks to spend. honestly i wasn't expending earth shattering bass from the reference series subs, but i did a install for a buddy who wanted infinity but didn't wana alot of cash so he got a single ten and it felt like my old friends 2-12 rockford subs, it was pretty freakin loud.

The problem is your not factory in the Extra money you'll need for a larger amp to power 4 subs as apposed to 2 subs. Your going to need twice the power.

nope, one amp. wire 2 subs in series and 2 in parr. and you get a bridged 4-ohm load at 280 watts rms to EACH speaker.this is why i would only do 1 or 4 subs. it allows me to use one amp(these speakers are not dual voice coil, or i could use just 2 speakers.

whats the amp?

i'm using a usacoustics amp b/c i don't have much money

i am going to spend about 900 bucks for EVERYTHING(expect if i get the 4 subs it will run around 1k)
panasonic HU 300 bucks
infinity reference 5.25 components 120 bucks
infinity reference 6.5 70 bucks
us acoustics amp 90
lighting audio .5 cap 80 bucks
amp wiring kit 50 bucks


one infinity reference sub
90 bucks box 60 bucks

four infinity reference subs
280 bucks

Price wasn't realy what I was refering to. When you were listing a price break down oyu missed the fact to run 2 subs you will only have to spend 1/2 as much on an amp as you have to to run 4 subs.

Also if you are talking about the USAcoustics USX 1000D then You have to wire the subs for a 1 ohm load to get the power out of it.

i'm talking about the usx 2080 that puts out 280X1 at a 4 0hm load. if i run one sub its at 4 ohm load, if i run 2 subs its either a 2 ohm or 8ohm load if i run 4 subs i can get the 4ohm load back.

Correct you are getting a 4 ohm load to the amp again but each sub doesn't get 280 watts. Thats all the power the amp can give. Each sub will get 280 / 4 = 70 watts rms, which isn't enough for those subs. Your better off with 2 8 ohm subs for that amp.

if the subs were dual voice coil then i could just run 2 subs, but there not so i can't

thats the thing though EACH sub gets the full 280 watts

Nope, electricity doesn't work that way, each sub gets 70 watts. The amp would have to produce over 1120 watts to get 280 per sub.

Sorry man either way you look at it, KVL or KCL, Kerchoffs(spelling) voltage law and current law.

KCL- The sum of the amperage drops in a parallel circuit must add up to the supply amperage.So since we have 2 sets of subs paralled the current must divide evenly between them and since good old ohms law again states watt = (volts)(amps) each sub only gets 1/2 of the over all input of the circuit.

So once the power splitts between the sub sets your down to 140 watts per set.

KVL- The sum of the voltage drops in a series circuit must add up to the supply voltage. So the voltage in the 2 sets of seriesed subs must divide evently and since watt = (volts)(amps) each sub only gets 1/2 of the over all input of that circuit.
Once the 140 watts gets to each sub it split between them giving you 70 per sub.

Your better off with a single Kappa or perfect 10.

Sorry dud only 70 watts a sub.

yes it would but the current would magnify in the series wired subs though

The only thing that can magnify current or voltage is another amp, since you have only one amp nothing else can yield more amps or volts.

I have an associates in Electrical Engineering Technology along wiht being a certified MECP installer for the last 2 years. Trust em its 70 per sub.

maybe i should go back to where i got my degree in sound engineering and ask them why they tought me wrong

Maybe were talking different things here.

You want to wire up 4 4 ohm subs to a single amp that at 4 ohms can only produce 280 watts RMS correct?

how loud would a rockford fosgate 10" power RFR3110 be with the 1000X1 @ 2ohm rockford fosgate punch power amp be?

yes 4 4ohm subs to a 4ohm amp

That all depends on the box and if it was desingened to be loud only.

Blue is better at the SPL stuff then I, but the best I have seen from a single 10 was in the high 120's. However take into account I almost never pay attention to the DB portion at shows. I recall someone claiming mid 130s from a single 10 in a firebird though.

And that amp produces 280 watts at 4 ohms, correct?

i'll just spend a fraction and get one reference sub and one cheap amp.

yes 280X1 at 4 ohms. if it really is only 70 a sub then i really honestly do need to go back and have a talk with them.

That single amp seems to be a good match for a single reference.

You may be thinking of another type of circuit but for power matching purposes subs are just considered a resistor.