Good Amp thats 3 Ohm Stable

[KHARPS 10+ year member]

I'm not sure if you're still looking for an amp but I'm selling some JL 1000/1's that do 1000w at 3 ohms.

 

[xguntherc 10+ year member]

Well, I got a Polk Audio PA600.1 that does 400w x1 at 2 ohm. and 600 at 1 ohm for a really good deal. That will do me over. but I might take your's..

How Much?

 

[Gemcoska 10+ year member]

So I have a 3 ohm sub jl 10w7 and am looking at the US amps MD-1D to power it. It puts out 400w at 4 ohms and 750w at 2 ohms. So what will it put out at 3 ohms? 575w?

 

[xguntherc 10+ year member]

Ya, give or take... but might want something higher.. whats the 10w7's RMS rating?

 

[Gemcoska 10+ year member]

THat's a good question. Here's what JL has to say:

http://mobile.jlaudio.com/products_subs.php?series_id=5

From the looks of the chart at the bottom, 'Optimum" would be 400w... I don't know what they mean by the thermal rating of 750w.

 

[bryan_15 10+ year member]

I don't know what they mean by the thermal rating of 750w.

it means how much the sub can handle before going //content.invisioncic.com/y282845/emoticons/wave.gif.002382ce7d7c19757ab945cc69819de1.gif

 

[jimmy22]

kharps!! how much for one of those jl amps and how old are they??

 

[jimmy22]

I'm not sure if you're still looking for an amp but I'm selling some JL 1000/1's that do 1000w at 3 ohms.

how much for one of these amps ive got a jl 13w7 needing something good

 

[n2audio 5,000+ posts]

Regarding your enclosure.

I haven't specifically seen the response curve with those subs, but typically sealed enclsoures give you a pretty nice (flat curve) but they fade gradually and often are of little use below 40hz or so. Fortunately that covers the vast majority of the LF spectrum in commercial music.

If, however, you like some rap and the ultra LF stuff in some other music a ported enclosure can go a long way to help reproduce that.

The w3v2 (not sure how close it is to the old w3's) PDF sheet on JL's site shows that a sealed enclosure has an f3 of around 40hz, which basically means you wont' hear much below that. Ported gets you an f3 of about 30, so you'll get decent response into the upper 20's.

It's a common misconception that sealed=sq and ported does not. That's really not true. What IS true is that a lot of ported enclsoures (and bandpass) are optimized for the 40-50hz range and get really loud at that point but don't do much below that.

But a well designed, large, low-tuned ported enclosure often yields an exceptionally flat response and a lot of low frequency extension.

The trade off is good ported enclosures are harder to build and larger.