Good day to all. Been a while since I last visited the site (where I got very good advice last time). Anyway, I'm considering on an upgrade in my subwoofer. Presently using one 10" sub w/ sealed box. Question is, which would give a considerable increase in spl: sealed box w/ 2 subs or ported box w/ 1 sub (subs being equal in specs and space not an issue) Thanks in advance. Ronald
Replies (8)
swez on 10/5/2006 00:03:06
Ronald,
A lot depends on the vehicle, the power amp rating and enclosure/sub(s) used on the install.
Sealed is very good for SQ bass applications where smooth transient response and decent SPL are needed. A good all around choice for a daily driver.
Ported designs are good for SQL/SPL bass systems. Here, we can use efficient subs, well tuned enclosures and modest to large power amps, depending on how much bass SPL is desired. It's like a turbo charger in some ways. When you want more power, it's there and will deilver as needed. (No turbo lag either)
The BP box, (One Note Wonders) are great for SPL Comps. But terrible for SQ. Depending on tuning alignments used in the fore and aft chambers, we can get some serious bass boost in a norrow band of bass.
All that said, what kind of gear do you have now and how much SPL Bass are you contemplating here?
swez
PS That vehicle, is that an SUV of some sort? Not familiar with that model.
MrBrownstone on 10/5/2006 15:54:25
Sort of a difficult comparison.
Comparing one 15" woofer to 2 10s in the same type of enclosure (sealed) would be fair.
Comparing two 12s seal vs 1 vented would depend on 4 things:
1. Sealed Max enclosure
2. Sealed Min enclosure
3. Sealed Medium enclosure
4. Vented @ what frequency?
Venting at ~30Hz to 35Hz will yield only a modest amount of output/efficiency, but give substantial low end extension.
Venting at 35Hz to 45Hz will provide a maximum amount of boost, but the woofer could easily be damaged if you send frequencies below the port frequency...so basically, you lose the very bottom end.
rldelrosario on 10/5/2006 20:06:06
Swez,
Thanks for the reply. Presntly, I'm using an infinity 6 channel amp with one 10" sub in a sealed box. Listen to van halen music although when I'm with the kids, they enjoy good thumpin music (pussycat dolls, wwe soundtrack). I'd like to add more spl, and my options are: 1) Use the same amp and sub, but change it to a ported box. or 2) Buy a 2-channel amp and hook up two 10" subs in a sealed box. I think either way I'll end up with the same size box. Any thoughts on this. Thanks.
Also, the Ford Everest is mid-size SUV released in the Asian market.
Ronald.
swez on 10/6/2006 06:11:02
Ronald,
Which sub are you running there?
If you did go ported, the box will be about 30-50% larger. Porting also nets about +3 more dB of SPL with same amping power, near the port tuning frequency. However, when porting we need an infrasonic filter to block harmful lows, below port tuning frequency.
This infinity amp?
http://www.crutchfield.com/S-41qpttSITTs/cgi-bin/ProdView.asp?g=120&I=108R5761A
swez
PS Did look up the Everest and see it's an Asian model of the Explorer or similar in US markets.
rldelrosario on 10/6/2006 18:29:10
Swez,
Yep, I'm using an infinity 5761a amp. Hooked up a infinity kappa 10" sub in sealed box. So what do you think? Should i go for the ported box or get a 2 channel amp and hook two 10" subs in a sealed box? Which would carry a bigger punch.
Ronald
swez on 10/6/2006 19:07:01
Ron, (if you don't mind)
Ported will give you a nice boost as this 2 channels (5&6) can be bridged to a 4 ohm load for almost 300 watts RMS power. Near the Port Tuning Frequency, (PTF) you'll get a +3dB boost which can be tuned, based on your box and tuning port design.
NOTE: A +3dB increase, is like using a 600 watt amp on this sealed sub. We use acoustic efficiencies for more SPL, rather than brute power.
Which Kappa model sub are you using here? This one?
http://www.crutchfield.com/S-dTaBXS0Hv3B/cgi-bin/ProdView.asp?g=520&I=108K1027W
swez (Dave)
rldelrosario on 10/7/2006 06:48:46
Dave,
Thanks for your inputs. Guess I'll go for the ported box.
Again, thanks a lot.
Ronald
swez on 10/8/2006 03:56:49
Just follow the recommendations given on your sub(s) and try a round port tube. These are easier to work with, port takes up less space and use an "infrasonic filter" to protect your sub.
Can give you details on the filter, but not sure what is available in your area. The lower you tune the port, (30-40 Hz.) the more important this filter will be at blocking harmful lows to the sub.
Swez
Replies (8)
swez on 10/5/2006 00:03:06
Ronald,
A lot depends on the vehicle, the power amp rating and enclosure/sub(s) used on the install.
Sealed is very good for SQ bass applications where smooth transient response and decent SPL are needed. A good all around choice for a daily driver.
Ported designs are good for SQL/SPL bass systems. Here, we can use efficient subs, well tuned enclosures and modest to large power amps, depending on how much bass SPL is desired. It's like a turbo charger in some ways. When you want more power, it's there and will deilver as needed. (No turbo lag either)
The BP box, (One Note Wonders) are great for SPL Comps. But terrible for SQ. Depending on tuning alignments used in the fore and aft chambers, we can get some serious bass boost in a norrow band of bass.
All that said, what kind of gear do you have now and how much SPL Bass are you contemplating here?
swez
PS That vehicle, is that an SUV of some sort? Not familiar with that model.
MrBrownstone on 10/5/2006 15:54:25
Sort of a difficult comparison.
Comparing one 15" woofer to 2 10s in the same type of enclosure (sealed) would be fair.
Comparing two 12s seal vs 1 vented would depend on 4 things:
1. Sealed Max enclosure
2. Sealed Min enclosure
3. Sealed Medium enclosure
4. Vented @ what frequency?
Venting at ~30Hz to 35Hz will yield only a modest amount of output/efficiency, but give substantial low end extension.
Venting at 35Hz to 45Hz will provide a maximum amount of boost, but the woofer could easily be damaged if you send frequencies below the port frequency...so basically, you lose the very bottom end.
rldelrosario on 10/5/2006 20:06:06
Swez,
Thanks for the reply. Presntly, I'm using an infinity 6 channel amp with one 10" sub in a sealed box. Listen to van halen music although when I'm with the kids, they enjoy good thumpin music (pussycat dolls, wwe soundtrack). I'd like to add more spl, and my options are: 1) Use the same amp and sub, but change it to a ported box. or 2) Buy a 2-channel amp and hook up two 10" subs in a sealed box. I think either way I'll end up with the same size box. Any thoughts on this. Thanks.
Also, the Ford Everest is mid-size SUV released in the Asian market.
Ronald.
swez on 10/6/2006 06:11:02
Ronald,
Which sub are you running there?
If you did go ported, the box will be about 30-50% larger. Porting also nets about +3 more dB of SPL with same amping power, near the port tuning frequency. However, when porting we need an infrasonic filter to block harmful lows, below port tuning frequency.
This infinity amp?
http://www.crutchfield.com/S-41qpttSITTs/cgi-bin/ProdView.asp?g=120&I=108R5761A
swez
PS Did look up the Everest and see it's an Asian model of the Explorer or similar in US markets.
rldelrosario on 10/6/2006 18:29:10
Swez,
Yep, I'm using an infinity 5761a amp. Hooked up a infinity kappa 10" sub in sealed box. So what do you think? Should i go for the ported box or get a 2 channel amp and hook two 10" subs in a sealed box? Which would carry a bigger punch.
Ronald
swez on 10/6/2006 19:07:01
Ron, (if you don't mind)
Ported will give you a nice boost as this 2 channels (5&6) can be bridged to a 4 ohm load for almost 300 watts RMS power. Near the Port Tuning Frequency, (PTF) you'll get a +3dB boost which can be tuned, based on your box and tuning port design.
NOTE: A +3dB increase, is like using a 600 watt amp on this sealed sub. We use acoustic efficiencies for more SPL, rather than brute power.
Which Kappa model sub are you using here? This one?
http://www.crutchfield.com/S-dTaBXS0Hv3B/cgi-bin/ProdView.asp?g=520&I=108K1027W
swez (Dave)
rldelrosario on 10/7/2006 06:48:46
Dave,
Thanks for your inputs. Guess I'll go for the ported box.
Again, thanks a lot.
Ronald
swez on 10/8/2006 03:56:49
Just follow the recommendations given on your sub(s) and try a round port tube. These are easier to work with, port takes up less space and use an "infrasonic filter" to protect your sub.
Can give you details on the filter, but not sure what is available in your area. The lower you tune the port, (30-40 Hz.) the more important this filter will be at blocking harmful lows to the sub.
Swez
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