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Old 5 Days Ago   #1
 
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Default 2 8s are hitting harder than my 13w7...

Okay, I'm scratching my head here....I am currently taking my system out of my girlfriends car because she's going to get a new car. Her factory system is going back in. She had 2 8" Dayton Audio Reference in a custom aero ported enclosure made to specs and an Alpine PDX-V9 powering it.
I removed the 13w7 and Gladen SPL1800C1 amp from my car and replaced it with the Alpine and Dayton's. Settings on my head unit were not changed at all. To my surprise, the Dayton's hit harder than my 13w7 at all volume levels. In fact I had to turn cut the subwoofer level by -10 and even then, it still hit harder than my 13w7.
Anyone have ideas as to why? The 13w7 should've annihilated​ the Dayton's, but it's not. Weird. The 13w7 is also in a custom aero ported enclosure built to specs and both enclosures were built by the same guy. Thoughts?

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Default Re: 2 8s are hitting harder than my 13w7...

Similar surface area with ported box efficiency and low excursion requirements to achieve high output

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Default Re: 2 8s are hitting harder than my 13w7...

How were the two enclosures aimed?

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by will. View Post
Similar surface area with ported box efficiency and low excursion requirements to achieve high output

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In the OP it says the 13w7 was also ported to specs.

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Default Re: 2 8s are hitting harder than my 13w7...

When I had my DD 2508ESP I tried a 12W6 and 12W7. The 8 had them in overall output but both the JLs had flatter range. And the 8 was on 2x the power.
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Default Re: 2 8s are hitting harder than my 13w7...

That's impressive

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by DC/Hertz View Post
When I had my DD 2508ESP I tried a 12W6 and 12W7. The 8 had them in overall output but both the JLs had flatter range. And the 8 was on 2x the power.
Maybe the Dayton 8's have a peak right in the punch zone making them seem louder. 40-50hz? Even if they model flat cabin gain will mess that all up anyway guaranteed

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Default Re: 2 8s are hitting harder than my 13w7...

i have a hard time believing this.. the w7's slam. also, were gains on both amps set to the same output?

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by Hillbilly SQ View Post
How were the two enclosures aimed?
The 13w7; sub up ports back. The Dayton's; subs back ports back. Vehicle is a FJ Cruiser.

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by SkizeR View Post
i have a hard time believing this.. the w7's slam. also, were gains on both amps set to the same output?
Yeah me too! The gains were not touched at all. Nothing on the amp nor the head unit was changed. It was only after there was too much bass from the Dayton's, that was when I had cut the bass level on my head unit. It was a straight swap from my girlfriend's car to mine. Even hearing it, I still can't believe that it hits harder than the 13w7.

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by will. View Post
Similar surface area with ported box efficiency and low excursion requirements to achieve high output

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Both are in ported enclosures built to specs.

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by Hillbilly SQ View Post
Maybe the Dayton 8's have a peak right in the punch zone making them seem louder. 40-50hz? Even if they model flat cabin gain will mess that all up anyway guaranteed
Yeah who knows. Without a dsp like the minidsp with umik, it's hard to say.

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by thisgsx View Post
The 13w7; sub up ports back. The Dayton's; subs back ports back. Vehicle is a FJ Cruiser.
Quote:
Originally Posted by thisgsx View Post
The gains were not touched at all.
either of these could be it. the gains not being touched can be relevant because the two head units in either car could have different output voltages.. the one in your car being higher. who knows.

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by SkizeR View Post
either of these could be it. the gains not being touched can be relevant because the two head units in either car could have different output voltages.. the one in your car being higher. who knows.
Could be, but probably not. Her head unit is the Pioneer avh5700bhs and mine is the avh5800bhs.

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Default Re: 2 8s are hitting harder than my 13w7...

There could also be a power difference with the W7 being SVC 3.
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Default Re: 2 8s are hitting harder than my 13w7...

The Dayton 8's have magic sauce in them. I'm serious. Mine should be garbage but they're fantastic haha

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by will. View Post
Similar surface area with ported box efficiency and low excursion requirements to achieve high output

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The 13w7 has roughly 50% more Sd than the 2 8's combined. When you factor in piston volume (Sd * xmax), it has a lot more (32mm vs 6mm)

Quote:
Originally Posted by DC/Hertz View Post
There could also be a power difference with the W7 being SVC 3.
It's actually dual 1.5, but yes, possible power difference but probably not enough to be overly meaningful.

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Default Re: 2 8s are hitting harder than my 13w7...

If I use my experience with large home theater subwoofers, it is likely a power difference. The 13w7 should hit harder than a pair of 8s. An 18" hits harder than a pair of 15s but only if the power is right. Under power the 18 and the 15s win.
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Default Re: 2 8s are hitting harder than my 13w7...

Distortion.
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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by bassfromspace View Post
Distortion.
problem with that is the dayton HO's are known to have very little distortion

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by SkizeR View Post
problem with that is the dayton HO's are known to have very little distortion
Doesn't matter. The 8's would need to play pretty hard to match the output of a ported 13. Excess distortion is often perceived as louder.
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Default Re: 2 8s are hitting harder than my 13w7...

Just brain storming... different ohms via wiring configuration from your Dayton set up vs the 13w7 thus your girlfriends set up is producing more wattage output by the amp due to impedance? Again...just a guess. I see that the 13w7 is D1.5, so I am guessing you have it wired for 1.5.... This is probably not the answer, but just trying to push the thought process forward...

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Default Re: 2 8s are hitting harder than my 13w7...

Maybe the FJ plays nicer with subs back port back than it does with sub up and port back? While I've only run sealed so far in my Grand Cherokee I can tell that the cabin reacts better to sub firing towards the rear than it does up to the roof. And yes I know sub up port back is a very common spl configuration.

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Default Re: 2 8s are hitting harder than my 13w7...

Quote:
Originally Posted by thisgsx View Post
The 13w7; sub up ports back. The Dayton's; subs back ports back. Vehicle is a FJ Cruiser.

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Sub positioning imo. Cabin gain from dayton subs and port facing back is my guess.
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Default Re: 2 8s are hitting harder than my 13w7...

Yeah. It's a fun setup. My buddy came over for a listen and he agrees, these Dayton's for some reason are louder than my setup with the w7. Looks like I'll be having this setup in my car for a while. I fried my Gladen this last weekend while camping/fishing so it's going in for repair.

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