Need Sound system help

schmidtsandwich · Mar 26, 2013

Hi, im having a bit of a problem trying to figure out the wattage of my system.

I have a 4ohm dual voice coil Power acoustik 700watt Rms 1800 watt peak 12" that i want to wire in parallel for 2ohms.the reason being my brother gave me a memphis amp that pushes 6-700 watts rms

if wired for 2 ohms, will the wattage of the speaker change?

also, if running this next to a 300 watt peak 4 ohm 2 chan, what size capacitor should i run?

this is a real shot in the dark but i hope someone on here can help me. trying to find this stuff online is next to impossible.

any info would be greatly appreciated.

Thanks,
-Adam

Blaaster · Mar 26, 2013

schmidtsandwich said:
Hi, im having a bit of a problem trying to figure out the wattage of my system.

I have a 4ohm dual voice coil Power acoustik 700watt Rms 1800 watt peak 12" that i want to wire in parallel for 2ohms.the reason being my brother gave me a memphis amp that pushes 6-700 watts rms

if wired for 2 ohms, will the wattage of the speaker change?

also, if running this next to a 300 watt peak 4 ohm 2 chan, what size capacitor should i run?

this is a real shot in the dark but i hope someone on here can help me. trying to find this stuff online is next to impossible.

any info would be greatly appreciated.

Thanks,
-Adam

The wattage of the speaker will not change but wiring them in parrellel will allow them to handle almost twice the power.

The formula for working out power handling in parrallel wiring is, product over sum. Speaker 1 x speaker 2, divided by , speaker 1 + speaker 2.

Blaaster · Mar 26, 2013

The amp must also be able to handle a 2 ohm load as it will be called to deliver almost twice the power of that of 4 ohms.

schmidtsandwich · Mar 26, 2013

Thanks

the amp is rated for two ohms at 600 watts.

so if ran in paralell, my rms wattage for the sub would be 1200?

Blaaster · Mar 26, 2013

Lets get a few things clear.

Total output of amp a 2 ohms is 600 watts, correct.

What ohmage and power handling of the speakers and how do you want to wire them.

Bear in mind that it is advisable to have a power amp of a larger size than the combined speaker handling to avoid dc pulses to the speakers.

schmidtsandwich · Mar 26, 2013

correct, 600 watts

its a dual voice coil at 4 ohms per coil. ran in parallel based on this diagram

http://a248.e.akamai.net/pix.crutch...nter/car/subwoofer_wiring/1DVC_4-ohm_mono.jpg

Blaaster · Mar 26, 2013

If the voice coils in the speaker will handle 700w each and it is then wired in parallel then the handling will be 1400w.

If so a 2000w amp at 2ohms should be used to drive them.

If the specs of the speaker say that the combined power handling of the dual coils is 700w, then really you should be using an amp with at least 1000w output into 2ohms.

Find out the handling of the individual voice coils in the speaker.

Wheels · Mar 26, 2013

schmidtsandwich said:
Hi, im having a bit of a problem trying to figure out the wattage of my system.

I have a 4ohm dual voice coil Power acoustik 700watt Rms 1800 watt peak 12" that i want to wire in parallel for 2ohms.the reason being my brother gave me a memphis amp that pushes 6-700 watts rms

if wired for 2 ohms, will the wattage of the speaker change?

also, if running this next to a 300 watt peak 4 ohm 2 chan, what size capacitor should i run?

this is a real shot in the dark but i hope someone on here can help me. trying to find this stuff online is next to impossible.

any info would be greatly appreciated.

Thanks,
-Adam

Is that Memphis amp pushing 600-700 watts rms at 2 or 4 ohms

schmidtsandwich · Mar 26, 2013

its 645 at 2 ohms

Blaaster · Mar 26, 2013

schmidtsandwich said:
its 645 at 2 ohms

Not big enough to drive a 700w speaker.

Any amount of overdrive from the amp will cause a DC current over the voice coil a which will be converted into heat and melt the windings.

schmidtsandwich · Mar 26, 2013

so what is the minimum i can put into the speaker at 2 ohms?

Blaaster · Mar 26, 2013

There is no real minium that is required, you can safely run your amp into the speaker, but the moment that you turn up the wick and, produce any distortion the voice coil will suffer.

The amp should work well but never let anyone but you touch the volume control.

It is a rule of thumb that the amp be bigger than the speaker handling to avoid DC peaks.

Sorry if I confused you but I presumed you understood the basics.

Oregondunes · Apr 2, 2013

I always get a kick out of car audio ratings. I often followup any specification with the letters "ILS" (If Lightening Strikes), cause very few actually deliver even near what they are claimed to do.

One of the best rated amps out there are made by Krypt. Their are designed for the marine industry and are a "G" rated amp. Not to many around that are that efficient.

Check em out Krypt KMA125.4 Class G/H Marine Audio Full Range Amplifier. I have the 500w 2 ch running my (2) 12" Kickers (DVC) running parallel. Granted I dont push them to full volume, but most everyone that hears em are amazed when I show em how small the amp is in size.

heres a lil clip inside a full metal pole barn with the doors closed from an iphone 4 last year.

The deck is a Fusion MS-IP500. The ipod actually docks inside the head unit and when the door is secured, makes the ipod water proof. This deck holds the highest rating in the marine industry. Ive sense replaced it with the newest MS-IP700. The new deck is completely controlled wirelessly from any apple product with wifi. http://www.fusionelectronics.com/marine/products/700-series/ms-ip700

B-1 · Apr 6, 2013

schmidtsandwich said:
Hi, im having a bit of a problem trying to figure out the wattage of my system.

I have a 4ohm dual voice coil Power acoustik 700watt Rms 1800 watt peak 12" that i want to wire in parallel for 2ohms.the reason being my brother gave me a memphis amp that pushes 6-700 watts rms

if wired for 2 ohms, will the wattage of the speaker change?

also, if running this next to a 300 watt peak 4 ohm 2 chan, what size capacitor should i run?

this is a real shot in the dark but i hope someone on here can help me. trying to find this stuff online is next to impossible.

any info would be greatly appreciated.

Thanks,
-Adam

Wiring on a sub doesnt change the power it can handle. You wire the sub up according to what amp your running. So if u have an amp that is 2ohm stable and you are only running 1 DVC 4 ohm sub you would wire that sub in parallel so that u can get full power out of your amp. and another thing to keep in mind is most companys rate their wattage diff. power acustik has changed over the years. there newer stuff isnt as good as there older. So if its a newer sub i doubt that it would handle true 700 watts rms. Now memphis is a good company with real power so that system should match up fine. and dont get a capacitor, their a waste of money might as well buy a new powerband for your blaster. If u want more power to your amp get a Kinetik HC600 or bigger.

Wheels · Apr 6, 2013

Oregondunes said:
I always get a kick out of car audio ratings. I often followup any specification with the letters "ILS" (If Lightening Strikes), cause very few actually deliver even near what they are claimed to do.

Have some green bc that made me laugh. If you buy a 3000 watt amp on EBay for $50 chances are it wont output anywhere near 3000 watts. Sometimes higher end amps like Rockford Fossgate will have a "birth sheet" like the one below that lists their actual output. The only other way to really know is to throw it on a test bench. From there you will still need to adjust the gain so your speaker doesn't distort on the high end or clip on the low end.

This is a cert from a RF p300-1 class D sub amp. it's marketed as a 300 watt amp but actually runs 251 watts rms at 4 ohms and 423 watts rms at 2 ohms (14.4 volts) 1269 peak. A cheaper company would probably market this as a 1500 watt amp 8-|

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