Group Delay help?

[Sir Swish 10+ year member]

I am tuning my Lanzar opti1533d subwoofer 4.5 @ 37 and my group delay seems crazy high. It is peaking at 61 ms. My sub seems to hate vented boxes. The EBP is 39.175257731959. That doesn't make sense for a Lanzar opti1533d. It is a SPL sub right? Am I not getting something here?

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[RAM_Designs 5,000+ posts]

Smaller box helps bring down the group delay. And yes, an ebp under 40 generally points to a sealed enclosure. 40-60 can swing either way, and 60+ is generally regarded as ported territory.

 

[Sir Swish 10+ year member]

Smaller box helps bring down the group delay. And yes, an ebp under 40 generally points to a sealed enclosure. 40-60 can swing either way, and 60+ is generally regarded as ported territory.

But how can that be? I thought this was an SPL sub? I am really confused. The T/S Parameters must be off because this doesn't make sense.

 

[JimJ 5,000+ posts]

Why are you hung up on this?