Bill's Conversational Musings

Speaker Design - Yesterday vs. Today

Speaker Config

So, found this going through some old boxes. My friend Scott used to make some THUMPING subwoofer systems back in the day. Those who went to high school with me will know what I'm talking about. We were always in the front lot, early in the morning.

Back then your PC needed a separate, stand-alone math coprocessor chip that was added to some motherboards just to run these calculations. Just think how far we have come.

I wonder if you can just give the parameters now to ChatGPT and have it do it for you.

UPDATE

As it turns out, ChatGPT can! LOL

Question: "If I give you the driver free-air parameters for a loudspeaker design, are you able to output the vented box design parameters?"

Response: "Yes, I can certainly help you calculate the vented box design parameters for a loudspeaker using the driver's free-air parameters. To design a vented (ported) box for a loudspeaker, you typically need the following driver parameters: Thiele-Small Parameters: Fs (Resonant Frequency) Qts (Total Q Factor) Qes (Electrical Q Factor) Qms (Mechanical Q Factor) Vas (Equivalent Compliance Volume) Sd (Effective Piston Area) Re (DC Resistance) Xmax (Maximum Linear Excursion)

With these parameters, you can calculate the following vented box design parameters:

Box Volume (Vb): This is the internal volume of the enclosure, measured in cubic feet or liters.

Port Diameter (D) and Length (L): These are the dimensions of the port tube, usually expressed in inches or centimeters for diameter and inches or centimeters for length.

Port Tuning Frequency (Fb): This is the frequency at which the box and port resonate. It's crucial for achieving the desired bass response.

Port Area (Ap): This is the cross-sectional area of the port.

Port Length Ratio (Lp/2r): This ratio determines the port's length compared to its radius.

Driver Placement and Enclosure Shape: Based on the driver's and port's dimensions, you'll need to determine how to physically arrange the components within the enclosure. The enclosure shape (e.g., rectangular, cylindrical) and driver/port placement are important design considerations.

I can help you calculate these parameters using the provided driver parameters, but please provide the Thiele-Small parameters for the loudspeaker driver you want to design the enclosure for. Once you have these parameters, we can proceed with the calculations."