Can i get both sq and spl if i go dual 12" sealed 500w vs one one 12" ported 1000w?
I like the ported rumble.
With 2 sealed i will gain more midbass, but can i rescue the rumble? I dont want to go 2 ported because then i loose the sq, plus needs a bigger box.
Car audio
Qts of the subs is 0.3
I like the ported rumble.
With 2 sealed i will gain more midbass, but can i rescue the rumble? I dont want to go 2 ported because then i loose the sq, plus needs a bigger box.
Car audio
Qts of the subs is 0.3
with 2 you can mount them push-push.
The power ratings don’t mean a whole lot.
I’d go sealed, but actual design & implentation is critical to performance.
dave
The power ratings don’t mean a whole lot.
I’d go sealed, but actual design & implentation is critical to performance.
dave
Last edited:
I'm a ported sub fan, I had a dual 8" sealed box in my truck and didn't like it... lots of upper bass but no LF and no amount of EQ would fix it. So I built a pair of ported boxes for the same drivers and they now sound fantastic, no EQ required for a wide flat response.
Yes….but your enclosure design has to be optimal for the environment given the cabin gain structure of your car. If you have a dedicated trunk space, then an IB (infinite baffle) is by far the best option using drivers with long excursion and a low Fs.
Some years ago it was all TH based/inspired designs in here, now it seems sealed boxes are the gospel.
I went on a crusade a few years back, trying to document evidence that bass reflex is absolute trash. After discovering that the vast majority of ported designs are simply poorly executed I will have to side with @conanski on this one.
Absolutely nothing wrong with ported designs if it's done right, the benefits outweigh the negatives by a large margin IMO.
I went on a crusade a few years back, trying to document evidence that bass reflex is absolute trash. After discovering that the vast majority of ported designs are simply poorly executed I will have to side with @conanski on this one.
Absolutely nothing wrong with ported designs if it's done right, the benefits outweigh the negatives by a large margin IMO.
Given the number of variables that is unfortuenatly far too common. The source of people disliking reflex boxes.
dave
You could argue that it takes 3 closed boxes to match the output of one vented box, with the same driver, at the vented box's lowest frequencies before rolloff.
The closed box is easy to construct, can be made very small and offer the possibility of infrasound with the proper eq settings. Closed boxes sans eq is only marginally useful.
So outside small spaces like cars and with no demands for infra I would go with vented.
If I wanted full blast at 12 Hz it is another matter.
In a stationary rig in a venue I would investigate a horn type alternative.
40 years ago drivers were designed with a pocket calculator at best. Thiele/Small was not well understood. "Alignments" were discussed In box design. There was no simulation. It was an art. Thats no longer the case. The drivers now are very good and there are many different kinds to choose from.
The problem nowadays seem to be availability of reasonable priced plywood...
The closed box is easy to construct, can be made very small and offer the possibility of infrasound with the proper eq settings. Closed boxes sans eq is only marginally useful.
So outside small spaces like cars and with no demands for infra I would go with vented.
If I wanted full blast at 12 Hz it is another matter.
In a stationary rig in a venue I would investigate a horn type alternative.
40 years ago drivers were designed with a pocket calculator at best. Thiele/Small was not well understood. "Alignments" were discussed In box design. There was no simulation. It was an art. Thats no longer the case. The drivers now are very good and there are many different kinds to choose from.
The problem nowadays seem to be availability of reasonable priced plywood...
No. As this is in a car all calculations are irrelevant - modeling is useless.
Rules of thumb:
Doubling the power gives you +3db.
A port gives you +3b for free at the frequency you select.
Roll-off below frequencies you cannot hear is irrelevant.
The alleged quality argument in favour of sealed enclosures applies to woofers - not subs. Cross a sub at 50hz, (disconnect everything else) all you'll hear is farts and rumbles - there is no quality The only difference is that a ported sub will fart twice as loud!
Any shape to the sound of bass comes from the harmonics delivered by the woofers.
Rules of thumb:
Doubling the power gives you +3db.
A port gives you +3b for free at the frequency you select.
Roll-off below frequencies you cannot hear is irrelevant.
The alleged quality argument in favour of sealed enclosures applies to woofers - not subs. Cross a sub at 50hz, (disconnect everything else) all you'll hear is farts and rumbles - there is no quality The only difference is that a ported sub will fart twice as loud!
Any shape to the sound of bass comes from the harmonics delivered by the woofers.
Adding more drivers gets you more realistic SPL and will require less power.
2x sealed be preferred regardless.
If this is a car application. Cabin gain plus normal mild bass boost is more than enough and completely different response
than what a sim shows.
Plenty of bass. Fast and accurate. No unloading with boost
2x sealed be preferred regardless.
If this is a car application. Cabin gain plus normal mild bass boost is more than enough and completely different response
than what a sim shows.
Plenty of bass. Fast and accurate. No unloading with boost
Cars have "room modes", move the mic position, open or close windows and you'll se a different response.
The +10 to 20dB gain below at 60Hz won't change as much as the upper response.
most music was "designed" in the studio with reflex boxes. Using closed boxes is from a hifi aspect correct but many people are unhappy with them.
Another argument is that in the lows loudspeakers are incedibly inefficient and not using the reflex augmentation is a waste of efficiency.
I once built a pair of front loaded corner horns with a 25cm, 10 inch drivers.
Only after adding a low tuned reflex port firing into the horn I had a headroom in the lows being impressive.
Another argument is that in the lows loudspeakers are incedibly inefficient and not using the reflex augmentation is a waste of efficiency.
I once built a pair of front loaded corner horns with a 25cm, 10 inch drivers.
Only after adding a low tuned reflex port firing into the horn I had a headroom in the lows being impressive.
I wonder if the ‘car’ has a ceiling to floor (or width) that contradicts the cabin length typically ? Seems a lot of people complain about frequencies in the 80-120hz region ?
Or maybe that’s because they’re trying to produce those with a stiff, heavy , big LE subwoofer and not some dedicated midbass speakers?
Depends on crossover and mic position.
Usually your crossed around 65 to 85 Hz
So with correct phase and highpass on door speakers. usually not to bad.
Usually cabin gain makes 45 to 55 Hz peak or bloom as well.
Response goes lower with cabin gain, so high Qts sealed speaker with roll off no big deal and sound quality is great.
Unless Fs is low enough, waste of time. 12" or 15" x2
Usually your crossed around 65 to 85 Hz
So with correct phase and highpass on door speakers. usually not to bad.
Usually cabin gain makes 45 to 55 Hz peak or bloom as well.
Response goes lower with cabin gain, so high Qts sealed speaker with roll off no big deal and sound quality is great.
Unless Fs is low enough, waste of time. 12" or 15" x2
Last edited:
Not if you tune a vented type enclosure to work with the transfer function.
BP4's with a 60-70hz tune usually gets you a nice flat response to 30hz or so.
Exactly!
I've blown drivers in a sealed enclosure.
I've NEVER blown a driver in a BP4 enclosure due to the basket being in the vented chamber.
15's in a 2001 F150 SuperCrew
1st sealed enclosure.
2nd sealed enclosure.