78 replies to this topic

[megamini_jb]

Right so doing some research and the JL amp and second sub should be perfect.... yes?

Edit:
amp -
175 watts RMS x 1 at 4 ohms
250 watts RMS x 1 at 2 ohms
(500 max)

sub - 300watt

Edited by megamini_jb, 01 October 2012 - 05:31 PM.

[Skortchio]

Most subs, JL Audio and JBL especially can more than comfortably handle excess power. In most cases you're better off over powering than under.

The amp you picked is above the subs minimum input so you'll be fine there, should be a nice combo!
Do you have an enclosure for the sub already or are you planning to make one, it's as important (probably more so) as the sub you use.
If you don't have one and plan to buy then you'll have to account for that in your budget.

Of course, if you can save a little more than the £120 you stated. There is this:

http://www.caraudiod...01-package.html


Ask nicely and they might throw you in a fitting kit for free (£15)

Edited by Skortchio, 01 October 2012 - 06:25 PM.

[megamini_jb]

Most subs, JL Audio and JBL especially can more than comfortably handle excess power. In most cases you're better off over powering than under.

The amp you picked is above the subs minimum input so you'll be fine there, should be a nice combo!
Do you have an enclosure for the sub already or are you planning to make one, it's as important (probably more so) as the sub you use.
If you don't have one and plan to buy then you'll have to account for that in your budget.

Of course, if you can save a little more than the £120 you stated. There is this:

http://www.caraudiod...01-package.html


Ask nicely and they might throw you in a fitting kit for free (£15)

Awesome. Thanks for that link of the JL audio package I don't mind if the sub is 200w or 300w to be honest. As long as it has some decent bass.

I was going to have an enclosure built under the false floor, but it'd be a shame to take the sub out of it's proper enclosure if I go for the package.

[freshairmini]

Right so doing some research and the JL amp and second sub should be perfect.... yes?

Edit:
amp -
175 watts RMS x 1 at 4 ohms
250 watts RMS x 1 at 2 ohms
(500 max)

sub - 300watt

The bigger jl sub runs at a 2ohm impedance, so that amp will provide 250watts rms. I will say tho having JL sub and amp may look nice buts its not the best option. JL have it nailed in regards to sub because thats what they specialise in and started out with. Amps not so much, personally there are better amps out there than jl for a similar price.

As Skortchio said subs like like to be a little over powered over the RMS and can be over powered by quite a bit. 250 watts will be ok but you wont get the same punch as a 300 watt amp or more.

Again from what ive experienced is this, I originally used a Genesis profile 2 amp which is a two channel amp that I bridged to get more power. This gave me 220watts rms (genesis generally underrate there amps so its could have been more, maybe 230 to 240watts). The sub run OK and gave a nice bass in my sealed enclosure (made to JL specifications), after getting the genesis profile sub which is 350watts rms (monoblock) which gave me a little more than the required rms for my sub its was far, far better, much punchier and generally better bass than before.

So yes that amo will power it at a little less power, it isn't ideal and you wont get the full potential of that sub. I would have a look around to see if you can get a more powerful amp that will provide the 300+ watts rms that you really need. In the long run it be a better route to go down.

[Skortchio]

If you have an idea already for an enclosure I'd go with that! Plus it'll help you retain a bit of boot space.

The other factor to look at (keeping it simple as possible here) past the RMS is the sensitivity, closer to 100 you get the more noise you get per input.

[megamini_jb]

Right so doing some research and the JL amp and second sub should be perfect.... yes?

Edit:
amp -
175 watts RMS x 1 at 4 ohms
250 watts RMS x 1 at 2 ohms
(500 max)

sub - 300watt

The bigger jl sub runs at a 2ohm impedance, so that amp will provide 250watts rms. I will say tho having JL sub and amp may look nice buts its not the best option. JL have it nailed in regards to sub because thats what they specialise in and started out with. Amps not so much, personally there are better amps out there than jl for a similar price.

As Skortchio said subs like like to be a little over powered over the RMS and can be over powered by quite a bit. 250 watts will be ok but you wont get the same punch as a 300 watt amp or more.

Again from what ive experienced is this, I originally used a Genesis profile 2 amp which is a two channel amp that I bridged to get more power. This gave me 220watts rms (genesis generally underrate there amps so its could have been more, maybe 230 to 240watts). The sub run OK and gave a nice bass in my sealed enclosure (made to JL specifications), after getting the genesis profile sub which is 350watts rms (monoblock) which gave me a little more than the required rms for my sub its was far, far better, much punchier and generally better bass than before.

So yes that amo will power it at a little less power, it isn't ideal and you wont get the full potential of that sub. I would have a look around to see if you can get a more powerful amp that will provide the 300+ watts rms that you really need. In the long run it be a better route to go down.

Right so doing some research and the JL amp and second sub should be perfect.... yes?

Edit:
amp -
175 watts RMS x 1 at 4 ohms
250 watts RMS x 1 at 2 ohms
(500 max)

sub - 300watt

The bigger jl sub runs at a 2ohm impedance, so that amp will provide 250watts rms. I will say tho having JL sub and amp may look nice buts its not the best option. JL have it nailed in regards to sub because thats what they specialise in and started out with. Amps not so much, personally there are better amps out there than jl for a similar price.

As Skortchio said subs like like to be a little over powered over the RMS and can be over powered by quite a bit. 250 watts will be ok but you wont get the same punch as a 300 watt amp or more.

Again from what ive experienced is this, I originally used a Genesis profile 2 amp which is a two channel amp that I bridged to get more power. This gave me 220watts rms (genesis generally underrate there amps so its could have been more, maybe 230 to 240watts). The sub run OK and gave a nice bass in my sealed enclosure (made to JL specifications), after getting the genesis profile sub which is 350watts rms (monoblock) which gave me a little more than the required rms for my sub its was far, far better, much punchier and generally better bass than before.

So yes that amo will power it at a little less power, it isn't ideal and you wont get the full potential of that sub. I would have a look around to see if you can get a more powerful amp that will provide the 300+ watts rms that you really need. In the long run it be a better route to go down.

Thanks for all your great advice. Alright so I'll stick with the 300watts JL sub I linked on ebay, but I've have a look now for a more powerful amp. So am I looking for something with a higher RMS?

[freshairmini]

A RMS of equal or more power that is required for the sub you choose. Basically 300watts or more will be fine.

[Skortchio]

Something around the 350-400w zone should give you a good punch, but it has to be a clean 350-400. Cheaper amps push out high power but it's all over the place signal wise, plus they aren't always very efficient so you get a lot of heat too and need more power in to get your power out.

Fresh will be able to give you the run down on which to look out for, I'm just getting into 'decent' ICE myself and have only gone as far as I need to get my set up.

[megamini_jb]

Ok cheers guys. Really appreciate it. I've never been good in this area lol

[conlad]

Just dont send TOO much power to the sub or you'll fry it... if you get a 500w RMS amp then the gain will have to be turned a lot lower than a ~300w RMS amp.

Under powering the sub will clip the amp because you are trying to send more power to the sub than the amp can handle.

Think of it trying to send two fat people through a door - not gonna happen!

[Skortchio]

What a great analagy!

Unless it's a GT5 then you have a flexible door

[conlad]

What a great analagy!

Unless it's a GT5 then you have a flexible door

Hahahaha ;)

That is true - those things seem to last!

[megamini_jb]

What RMS am I looking at 2ohms or 4 ohms

[conlad]

4ohm :)

[Skortchio]

RMS = power, in watts 300-400

resistence = Ohms, to match your sub, as a rule of thumb only. Some amps can run stable at different levels, also if you have 2 x 4ohm subs (or one with 2 coils) you can wire them in such a way they pull 2ohm from the amp. But thats getting technical