Improving on the meter

[Jeffdachef 5,000+ posts]

You might want subs and port up fire then.

 

[wew lad 5,000+ posts]

You might want subs and port up fire then.

That's what I was planning on, CSCStang it might not load properly without the port being 12 inches from the roof though, and it definitely won't be that close so I dunno I guess it's worth a try

 

[YukonXL04]

What's the truck? And guessing sub forward port side? You have the power... really just need more come area...

Are you running sweeps while moving seats and stuff or just tones? Cause moving things around inside can change the peak frequency.

Still makes for a fun daily.

Had a 00 sierra with 2 15s forward, ports side on 2k and it was doing 147-148.

 

[Chris McNeeley]

Wifes crv can do 146 @44 with single 15 on under 1200w,

While my 2 tantric hdd 15s in the subaru on 7k barely did 147. I'm convinced there's no logic in spl

 

[wew lad 5,000+ posts]

What's the truck? And guessing sub forward port side? You have the power... really just need more come area...
Are you running sweeps while moving seats and stuff or just tones? Cause moving things around inside can change the peak frequency.

Still makes for a fun daily.

Had a 00 sierra with 2 15s forward, ports side on 2k and it was doing 147-148.

00 Silverado Ext cab. First of the nbs, similar to the 03-07 inside

It's sub forward driver side port passenger. Not sure why I didn't think about it until now but I do remember setting it up so it'd be louder where I am than the pass side so I need to try metering it on the driver side although it's not legal it'll give me an idea of what I'd be at if I oriented it differently.

The power is there and it isn't, I'm at the limits of the sub lol it's a 12k amp that does in fact do rated but it is not doing 12k after rise, voltage drop, and the limitation of the sub.

Wifes crv can do 146 @44 with single 15 on under 1200w,While my 2 tantric hdd 15s in the subaru on 7k barely did 147. I'm convinced there's no logic in spl

I can certainly agree with that statement. I was mostly curious to see what I could do to get louder, not chase tenths and I'm getting a better idea thanks to the meter and your guy's insight.

It'll really start to be interesting once I get more cone area.

I'm still very happy with the output, it's arguably louder by ear than people doing low 150's with 2 15s and I mean, you do use your ears to determine loudness after all. But I can't "brag" if I don't meter loud although I don't really need to considering other people's systems honestly **** in loudness compared to this.

 

[hispls 5,000+ posts]

The box is tuned to 35, and testing pretty much proves that as the sub barely moves around the frequency.
As far as 50hz goes, I'm guessing that's a resonance as I didn't play anything at 50hz but I'll give it a go. Definitely won't get as much power due to voltage drop but if I do peak up there that'll definitely be weird because it doesn't sound that way on music.

I'll mess with it in WinISD but considering it's a team driver and has a large thermal mass I imagine the 35% variation rule will absolutely be a factor

Is that 146 picture your response curve? Is there not a peak a bit up higher? Once you have your volume set keep testing tones up and up and up to about 60hz anyway. You may start going down after around port tuning but start gaining again >50hz or wherever you get near the cabin resonance. 27hz peak may just be 8th wave with 1/4 wave at 54hz?

Some weird things going on, obviously im missing something. The larger I make the box the bigger the peak gets almost to no limit (obviously it'd be bottom out where it doesnt show on this chart)
this is 3 cubes vs 5 cubes @ 35

vs

5 cubes @ 40

this driver clearly likes higher frequencies to peak at

the 3 cubes at 35 looks a lot like my response curve right now, making me think somehow my box appears to be more towards 3 cubes than 5 cubes which *****.

I like the looks of the 5 cube higher tuned. Those lines look like about what I'd expect.

 

[tymoto21 10+ year member]

oohhhhhh its a truck.... i read trunk

if possible try sub forward port up, it may not work well in the larger body truck but ive seen it do great in s10's

 

[wew lad 5,000+ posts]

Is that 146 picture your response curve? Is there not a peak a bit up higher? Once you have your volume set keep testing tones up and up and up to about 60hz anyway. You may start going down after around port tuning but start gaining again >50hz or wherever you get near the cabin resonance. 27hz peak may just be 8th wave with 1/4 wave at 54hz?
I like the looks of the 5 cube higher tuned. Those lines look like about what I'd expect.

I was thinking the same thing. I wish I knew more people local to help me learn how to make some aeroports. It's setup where I could just pull the port out and throw in a shorter port and I have no doubt I'd gain because of the increase in volume, and increase in tuning. I might even try something crazy like a 10 inch port and do some sort of burp lol

The top is a response curve but I didnt go past the low 40's with it, obviously I need to try that now

 

[Popwarhomie 5,000+ posts]

Stick your **** in it.

 

[hispls 5,000+ posts]

I was thinking the same thing. I wish I knew more people local to help me learn how to make some aeroports. It's setup where I could just pull the port out and throw in a shorter port and I have no doubt I'd gain because of the increase in volume, and increase in tuning. I might even try something crazy like a 10 inch port and do some sort of burp lol
The top is a response curve but I didnt go past the low 40's with it, obviously I need to try that now

Go down to Home Depot and buy a stick of sonotube and use that. Given adequate port area flares aren't really terribly beneficial and if you look at Terry Brock's trunk boxes the outside of the port isn't really flared at all. It's a quick cheap way to play with port tuning anyway and you can always buy or build flares if you hit on a round port configuration that you really like.

 

[tymoto21 10+ year member]

You could get an adjustable metal flaired port

I have an 8” one

I think pyscoacoustics makes them.

 

[THATpurpleKUSH 5,000+ posts]

Or use the versatune ports by Big Ass Ports. There's gotta be a major bottleneck with that box if you can't do a 150 with that equipment in that small of a cabin.

 

[YukonXL04]

You could try to plug your current port, and buy you 8" thin wall PVC. And cut a couple holes and try different port placement.

 

[Boominburban 10+ year member]

In MECA driver side headrest is a legal position to meter in ....fyi. Have you tried metering there yet?

 

[wew lad 5,000+ posts]

Go down to Home Depot and buy a stick of sonotube and use that. Given adequate port area flares aren't really terribly beneficial and if you look at Terry Brock's trunk boxes the outside of the port isn't really flared at all. It's a quick cheap way to play with port tuning anyway and you can always buy or build flares if you hit on a round port configuration that you really like.

Thanks I'll try that. Almost considering just doing a big *** 10 inch port tbh

You could get an adjustable metal flaired portI have an 8” one

I think pyscoacoustics makes them.

they're out of business

Or use the versatune ports by Big Ass Ports. There's gotta be a major bottleneck with that box if you can't do a 150 with that equipment in that small of a cabin.

driver/port placement and being tuned for daily im guessing. maybe the box is too small, but ive had a few people tell me these subs want 3.5 cubes not 4.5 cubes so idfk