Fun with 604E

[SNR]

I should clarify I loaded up the "Loudspeaker toolkit spreadsheet" that generated what you requested, (Vas Qts) with the exception of me manually measuring Q and entering it. (It should change a bit after I enter Q).

 

[GM]

You’re welcome!

It's considered the most accurate, but for a long time now folks have been getting plenty good enough results using the added mass method.

Many folks use tire or other known value weights evenly distributed around the felt ring [in the 604’s case] to lower Fs by at least 1.56x = ~19.87 Hz to mimic the increased compliance of a sealed box, then it’s just a matter of adding their marked weights all up, then calculating Vas [method 2]: Measuring Loudspeaker Driver Parameters

GM

 

[SNR]

I will see what I can come up with!

 

[GM]

It just 'dawned' on me that once you break the seal between the driver/cab, you can probably do the test without removing the drivers once a few wedges are installed to maintain a > 1/4" gap, assuming your mounting bolts aren't too short.

GM

 

[SNR]

No worries I don't mind taking them right out.

 

[GM]

So, what did you come up with?

GM

 

[jpak]

GM your PM/email is disabled. If you wouldn't mind could you send me an email or PM, I have some questions on the GPA 604E. Thank you.