Box Modification Spl Gains

[sundownz]

Indeed - if your box is very small it may hurt you if the corner pieces take up too much room. In my box the volume occupied by these pieces is fairly insignificant compared to the overall volume.

[Bunker]

REVERSE ARCH cough cough

[sundownz]

REVERSE ARCH cough cough

Going to test those vs. 45s like I said in the first post - I will cut the 4x4 into an arc shape and test those too.

Looks like that when done.

[Bunker]

I mean like this the 1 = box, ( = arch

This way works better 1( than 1)

[sundownz]

I wanted to see how much my internal port PVC piece was doing so I took it out this morning :

* With

* Without

Without - 154.9 dB (verified two runs 12 minutes apart)

With - 155.2 dB

So that piece is worth around 0.3 dB!

The score "with" is within tolerance since my speaker wires moved around in the port with the subs in and out... I need to get those out of the port - will probably do that today before further testing to eliminate that variable.

[zfrerichs]

but if your 45's take up to much space you lose db's

or it will raise tuning and gain dbs to get it to the peak of the vehicle

[07sOnAtA sp.ed]

or it will raise tuning and gain dbs to get it to the peak of the vehicle

thats what i think happened

[JustinT]

I put resin arcs in my box...seems like it would help more over just 45's.

[sundownz]

I put resin arcs in my box...seems like it would help more over just 45's.

I'll be finding out soon enough

[sundownz]

Yesterday I put in another 45 degree piece:

Nothing really changed - did 155.2 dB.

Then I drilled holes to get the speaker wires out of the port... no change. BUT they were not sealed up - just holes.

---

TODAY I got threaded brass rod, washers, and nuts to make a proper connection :

I should add that before I had a smaller wire jumping from one coil to the other to parallel the coils. Now I have two sets of wires going to the common point (this is probably part of the gain I saw).

So I am up 0.3 dB from my best score and 0.4 from the score I was doing yesterday consistently.

I would say part is due to moving the wires out of the port (this has always gained me in the past) and part was due to the superior connection of running two sets of large wires off the coil.