Will Sd x Xmax Always Tell You The Loudest Sub?

WarDrumz
10+ year member

Hebrew Israelite
I keep reading that Sd times Xmax gives you the amount of air a sub can displace. And since BASS is, from what I understand, all about moving air, then will the numbers ALWAYS tell you the loudest sub(s) before you even have to hear them?

Because if that's the case then all the "SQL" fans just need to find a sub that sounds good with the longest throw possible.

And again, if that is true than these (below) are in a class by themselves.

The Untouchables:

1) JL Audio 13W7

2) Elemental Designs A Series 15"

3) Resonant Engineering XXX 15"

Is that ALWAYS the case?

 

drjjg
10+ year member

Senior VIP Member
In terms of LINEAR displacement, which matters in terms of musical reproduction(not SPL burping) Yes, those subs(in contrast to lower linear displacement subs) will be able to move more air, more cleanly. The more air you move cleanly, the louder you will get while still maintaining very low distortion. Add in BL flattening technologies, like the XXX's or the W7, coupled with huge linear excursion and you have a sub that that is ideal for musical reproduction(that is if you like the lowest possible distortion at any given volume level)

Of course, you need to use an appropriate enclosure, with the right amount of power to use the linear displacement a driver like that affords you, and use it effectively. You wouldn't want to pull a 'Below 30' and waste the huge potential of the driver //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif :p

 

helotaxi
5,000+ posts

Kilroy was Here
Is that ALWAYS the case?
Nothing is ALWAYS the case. Larger Sd and Xmax point toward the POTENTIAL to get louder, but that does not mean that they will. Getting a sub to it's Xmax (especially the modern super subs) at all but the lowest of the low frequencies or with less than several kilowatts of power is nearly impossible. Add in a ported enclosure and the extra damping it provides and the task becomes even more difficult. There is so much more to the equation than merely theoretical displacement. It comes down to actual achievable displacement which includes motor strength at the extremes of excursion, power, enclosure, frequency, etc...

 

bigbassman
Premium Member

Master of all things loud
3,082
0
Southern WV
Sd x xmax will tell you the loudest sub if:

1. talking sealed enclosures

2. no limit on power availible

3. no limit on distortion level

otherwise.. it won't //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Loyd L.

 
Activity
No one is currently typing a reply...
Old Thread: Please note, there have been no replies in this thread for over 3 years!
Content in this thread may no longer be relevant.
Perhaps it would be better to start a new thread instead.

Similar threads

Some circuits do have a constant draw, if there is a load that uses it, like radio settings, but it's not a battery pushing out that voltage. There is a load that is drawing that voltage. That's...
2
737
That’s barely rarified air in home audio. Those guys use interconnects that cost more than my system, lol. I’ve heard some of the lower end of that stuff and even THAT is amazing. Good on them...
21
3K
Ive never seen this amplifier before. Can you take a pick of the back? Interesting amplifier.
8
783
Without a photo this is the best I could come up with, note the "physical port length" is at 22.5" and if you measured down the portwall to get 22.5" the port is actually longer. This is assuming...
1
1K

About this thread

WarDrumz

10+ year member
Hebrew Israelite
Thread starter
WarDrumz
Joined
Location
BABYLON THE GREAT
Start date
Participants
Who Replied
Replies
5
Views
2,447
Last reply date
Last reply from
WarDrumz
92E04DB4-A2FA-4193-A353-6DE01343F057.jpeg

Lt Ye Htun Oo

    Feb 20, 2024
  • 0
  • 0
1708449173869.png

RobGMN

    Feb 20, 2024
  • 0
  • 0

Latest topics

Top