A couple questions about Q15.

[bmr4life 0]

I'm about to purchase one to go with my JBL 1200.1

Plan is to make a sealed enclosure. I have up to 3 cubes to work with and I see that Fi recommends 2-2.6

What size should I make it? I'm looking for deep and tight bass. I love low lows and when the sub just slams.

Other question is weight. How much does a Q15 weigh?

Last question is can I run the full 1200 watts to the Q15?

thank you

Edited March 17, 2008 by S197

[Naledge503 0]

I'm about to purchase one to go with my JBL 1200.1

Plan is to make a sealed enclosure. I have up to 3 cubes to work with and I see that Fi recommends 2-2.6

What size should I make it? I'm looking for deep and tight bass. I love low lows and when the sub just slams.

Other question is weight. How much does a Q15 weigh?

Last question is can I run the full 1200 watts to the Q15?

thank you

Do 2.6cuft after displacement.

Sorry dont know the weight.

Yes 1200rms to a Q will be fine.

[ford302redneck 15]

I'm about to purchase one to go with my JBL 1200.1

Plan is to make a sealed enclosure. I have up to 3 cubes to work with and I see that Fi recommends 2-2.6

What size should I make it? I'm looking for deep and tight bass. I love low lows and when the sub just slams.

Other question is weight. How much does a Q15 weigh?

Last question is can I run the full 1200 watts to the Q15?

thank you

Do 2.6cuft after displacement.

Sorry dont know the weight.

Yes 1200rms to a Q will be fine.

34lbs I beleive.

and Yes, 1200rms would be be fine.

[bmr4life 0]

I really like this forum. You guys get back quick. I'm this close to ordering, only thing is I'm checking out the Havoc. Anyone know if it truly goes deeper like that one review said?

[shizzzon 461]

i'm gonna post this as i want this set in concrete instead of having people tell their side of the story everytime says this because i am curious as well if i am wrong about this-

I have never used Fi products but have heard a LOT of people say the Q lacks low end and others say it doesnt.

Now, i dont know the specs of people's boxes who said it lacks low end but let me chime in on what i believe and someone back me up if i'm right about this.

Using a Q in a sealed box, any sub in a sealed box for that matter, the larger the box, the deeper it will play and the more efficient the box in that low end area but may lower power handling if you exceed the maximum requirement size for a sealed box.

So, if Fi recommends no higher than 2.6, then use that size for awesome low end response as there will be.

Now, for those who say low end is lacking in the Q, this is where i need this confirmed-

From graphs i've seen and specs, it is my belief that unless you tune the Q lower than the average sub, that it may actually sound less loud in the low end as another sub you may compare to.

Let's compare the Q to the BL for example.

If you wanted both subs to do best in the 30-40hz range, you may port the BL at let's say 32hz for it to probably peak around 35hz.

The Q, (my belief) takes longer to peak as it gradually increases it's output past tuning slower. So, if you tune the Q to 32hz, it may not peak til around 40hz or even higher...

Anyone confirm this, that would be the end all lack low end responses from the Q.

Not only that, but if you look at recommendations for both a Q15 and BL15, the maximum recommended tuning frequency for a BL is 37hz but for a Q is only 33hz... again, that's what i believe is going on with the Q but if i'm wrong, then let me know why.

[ford302redneck 15]

I haven't heard anybody complain about the low end?

But I've heard some about the upper end, but thats where a good front stage/midbass comes into play.

[Naledge503 0]

i'm gonna post this as i want this set in concrete instead of having people tell their side of the story everytime says this because i am curious as well if i am wrong about this-

I have never used Fi products but have heard a LOT of people say the Q lacks low end and others say it doesnt.

Now, i dont know the specs of people's boxes who said it lacks low end but let me chime in on what i believe and someone back me up if i'm right about this.

Using a Q in a sealed box, any sub in a sealed box for that matter, the larger the box, the deeper it will play and the more efficient the box in that low end area but may lower power handling if you exceed the maximum requirement size for a sealed box.

So, if Fi recommends no higher than 2.6, then use that size for awesome low end response as there will be.

Now, for those who say low end is lacking in the Q, this is where i need this confirmed-

From graphs i've seen and specs, it is my belief that unless you tune the Q lower than the average sub, that it may actually sound less loud in the low end as another sub you may compare to.

Let's compare the Q to the BL for example.

If you wanted both subs to do best in the 30-40hz range, you may port the BL at let's say 32hz for it to probably peak around 35hz.

The Q, (my belief) takes longer to peak as it gradually increases it's output past tuning slower. So, if you tune the Q to 32hz, it may not peak til around 40hz or even higher...

Anyone confirm this, that would be the end all lack low end responses from the Q.

Not only that, but if you look at recommendations for both a Q15 and BL15, the maximum recommended tuning frequency for a BL is 37hz but for a Q is only 33hz... again, that's what i believe is going on with the Q but if i'm wrong, then let me know why.

Well. I have had my pair of Q 15's ported in 3 different enclosures.

1. 7.6cuft after disp. tuned to 32Hz. In 89 Range Rover

2. 8.0Cuft after disp. tuned to 30Hz In 89 Range Rover

3. Sealed 5.1 cuft after disp. In 95' Integra 2 dr coupe (hatchback)

Out of all 3 boxes the 1 thing that never lacked was the low end. The Q is made for great low end extension. Now being that I had them tuned low, the higher end did roll off low as well. If someone is wanting a high tuning then the Q is not for them.

Out of the 3 boxes, the sealed enclosure definitely plays a wider range of frequencies and reaches down lower than even the 30Hz enclosure.

Thats just my experience with the Q. I'd like to hear others as well.

[JimJ 11]

They really don't need that much power to get satisfactory results...I thought 900W to one was plenty.

Using a Q in a sealed box, any sub in a sealed box for that matter, the larger the box, the deeper it will play and the more efficient the box in that low end area but may lower power handling if you exceed the maximum requirement size for a sealed box.

Even "exceeding" the size for a sealed box isn't always a bad thing, after all, infinite baffle is simply a very large sealed enclosure. Just reduces mechanical power handling, but that's not a bad thing, necessarily.