12 replies to this topic

[FreQuence]

I'm shopping for a new amp/amps for my DD 3515 dual 1.5 ohm sub. I have 3 options - 3 ohm, 0.75 ohm or dual 1.5 ohm configs. Whats I was thinking is maybe running a single big amp at 0.75 or a pair of mid sized amps at 1.5 each. The single amp would be cheaper and easier to implement for me, but i'm worried about the impedence. I know impedence rise is abundant in spl cars for burping, but how would I go running a daily system at 0.75 with a 1 ohm amp? Am I ok in thinking that imp rise will take me over 1ohm at most frequencies, therefore not smoking my amp?

[Lunchbox.inc]

hmmmm it's a hard one... i will let other more knowdegable on the matter give a more definitive answer,

but i would say to aim for a higher impedance than a lower one for daily use, i don't think you would have too many issues running at .7ohm on most amps, but i always like to err on the side of safe... as at .7ohm your getting mighty close to a strait short, 3ohm is a much nicer place to be for daily listening...

maybe buying a bigger am than you need and then running at a lower impedance? you could always swap it down to .7ohm at comps if you compete...?

i know Big Val is selling a nice big monster of a clif designs mono nice and cheap atm....?

[D34M0N.inc]

If it was something like crusher id feel safe doing so with proper battery power. But if your that worried 2 amps at 1ohm could be the go

[KSR]

With the 3515, I had run it on Sorin's Hertz HP1D mono @ 0.75ohms, bass raced with 2 x 75Ahr Absorbed's behind it with no dramas, neither amp or sub got warm or showed any negative signs... Though if you want to be safe, 3ohms daily, 0.75 for burps!!

[D34M0N.inc]

The main thing you need is a strong power supply in your amp and the battery power to support it. I could run my amp .5 all day because i got the battery power to handle it.

[Big_Valven]

IMO there's no use running it below minimum rated impedance ie 0.75 ohms daily. 3 ohms would be safe and for music listening still heaps loud really.

[FreQuence]

My problem with running at 3 ohm is that there aren't many amps at my price range that will give me the power I want. The Alpine 2k amp is the closest I can find that does good power at 3-4 ohms, but its over my budget. I can get pair of Fusion/Kenwood/Option amps that all do around 700-900rms at 1.5 ohm for just over $500, maybe thats the way to go unless someone knows of a single amp with 1.2k plus at 3-4 ohm around $500?

[paulxr6]

Have a look on Ebay. Plenty of Jaycar 1500rms amps on there atm:)

[Lunchbox.inc]

FreQuence, on 11 January 2012 - 06:52 PM, said:

unless someone knows of a single amp with 1.2k plus at 3-4 ohm around $500?

well if someone was a little quicker they could of had Big Val's clif designs mono that does 2,500rms @ 4ohm... lol

[FreQuence]

Lunchbox.inc, on 12 January 2012 - 01:48 AM, said:

well if someone was a little quicker they could of had Big Val's clif designs mono that does 2,500rms @ 4ohm... lol

For $500? Now that would have been a steal.

[bobo333]

holy crap so many jaycars

[Pulse-R]

If you get a second hand JL "Slash" 1000/1

They bench around 1100 - 1200 RMS, 1 ohm to 4 ohms.

[FreQuence]

Pulse-R, on 14 January 2012 - 10:34 AM, said:

If you get a second hand JL "Slash" 1000/1

They bench around 1100 - 1200 RMS, 1 ohm to 4 ohms.

Yep one of those or a PG Xenon 1200.1 which does the same I think. I might just have to go with 2 x amps, one for each coil @1.5. Should still get 1500rms+ if I choose right.