Adding additional cab

[Bill Fitzmaurice]

250w mechanical requires 8mm xmax.  One of the best, and most expensive, tens is the Eminence KL3010LF, which has 8.5mm xmax. You won't find it in other than expensive boutique cabs. The more typical Deltalite II 2510 xmax is 4.2mm. It reaches xmax at 100w.

[stevie]

Bill's right to point out that many (most) bass cabs cannot make use of their thermal power rating because they exceed xmax well before that point. However, I think he's being a bit pessimistic about the xmax limits of premium drivers.  Eminence publish info on the displacement capability of the KL3010LF, which shows that xmax remains below the driver's rated power of 450 watts from 40Hz up. If it could handle the power, it could take 600W before reaching the xmax limit.

Not the whole story, of course.

 

(By the way, the displacement graph is a bit odd because the curve should continue to rise below 40Hz.)

[Chienmortbb]

1 hour ago, stevie said:

(By the way, the displacement graph is a bit odd because the curve should continue to rise below 40Hz.)

While not having the eminence of many on here, I have modelled enough drivers, including the KL3010LF, to know that there is a serious amount of High Pass Filtering applied on that eminence graph.

[Bill Fitzmaurice]

It is high passed. That's not something often seen with bass amps but it's SOP with PA subs. To do it with bass amps you'd use a Thumpinator or the like.

[stevie]

You're both right. 😄 I posted the graph for a highpassed cab. Here's the one I meant to post, which Eminence have modelled with 400 watts. It's comfortable with that power from 45Hz up. Tune the box a bit lower and it will just about make 600 watts at 40Hz (but would certainly benefit from highpassing at that frequency). It's also worth bearing in mind that bass guitar isn't the same at test tones.

 

Edited May 15, 2023 by stevie

[Chienmortbb]

33 minutes ago, stevie said:

You're both right. 😄 I posted the graph for a highpassed cab. Here's the one I meant to post, which Eminence have modelled with 400 watts. It's comfortable with that power from 45Hz up. Tune the box a bit lower and it will just about make 600 watts at 40Hz (but would certainly benefit from highpassing at that frequency). It's also worth bearing in mind that bass guitar isn't the same at test tones.

 

That is what I was expecting.