Are 45*s needed with in boxes that use PVC tubing as ports?

Edited February 26, 200817 yr by etc.

Do you mean 45 degree bends in the PVC or the corners of the internal air space?

Moving to SPL & SQ / Competition & Fabrication

Do you mean 45 degree bends in the PVC or the corners of the internal air space?

For the corners of the internal air space

Do you mean 45 degree bends in the PVC or the corners of the internal air space?

For the corners of the internal air space

Putting the 45* corners in the corners of the internal air space will have the same effect with a PVC port as with a slot port

In which neither may gain anything.

In which neither may gain anything.

i agree, i'd only use 45's on tlines or maybe certain type horns in which the wave needs to travel a certain way other than that IMO their a waste of time, if you do gain anything it'll be in tenths of a DB and unless your competing will be pointless in a daily driver.

In which neither may gain anything.

i agree, i'd only use 45's on tlines or maybe certain type horns in which the wave needs to travel a certain way other than that IMO their a waste of time, if you do gain anything it'll be in tenths of a DB and unless your competing will be pointless in a daily driver.

I guess there could be many different reasons why one would use em. I don't see myself doing it to "gain" anything, as far as a number on the sensor. Sometimes u even lose. Thats where testing before and after sorta thing comes in.

Now, if your doin it for support, or to take up airspace, I guess it could work.

the reason for 45's mostly would be to reduce port noise as mentioned in t-lines and other ported alignments as well. using them in an aero port (pvc in this case) or sealed box wouldn't yield any benefits.

45s are meant for a consistent line area also...not just for transmission lines.

Basically any port with a bend should have a 45 or better in the corners...not totally necessary but it helps

Thanks for the information

I will be using a 7/8 dow rod in the center between the speaker and the port for added bracing

SPL competitors often 45* all of the corners in their boxes because it does make a difference on the meter for most of them

How much of a difference. Tenths of dB?

How much of a difference. Tenths of dB?

Probably something like that.

Not audible, but a sensor will detect it.

I always do rounding with 4" diameter in my the corners of SPL boxes (using body filler/fibreglass) not 45* angles... then resin the box and sand to smooth... I gain anywhere from 0.5 -2 dB more gain noticed in smaller boxes and the smoother you do it. in my original design I make sure I will have enough space that I dont make the box too small to tune properly.