Extreme BL subs bad for ported?
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 1744 Registered: Jan-06 | I was told that a sub with an extremely high motor BL would make a ported enclosure impractical because it would be too peaky, how true is this? I was looking at some TC 5200 and was told should be used in a sealed enclosure, less than 2cf and with 4500rms. I really like these subs but with a pair sealed behind the back seat break a 150 (folding seat)? Polo.. |
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Gold Member Username: AdddisorderWest palm, Florida Post Number: 1458 Registered: Jan-06 | alot of people on caraudio.com use tc subs, i dont think any people here know to much about them |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 1745 Registered: Jan-06 | I am looking for an "in general" type of answer. I need to know how BL effects wether or not we can place it in a sealed or ported enclosure. Polo.. |
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Gold Member Username: Cenus4, 20 Post Number: 2400 Registered: Jan-05 | i allways thought the higher the bl the better it would be for ported, idk how to explain it clearly but thats what i thought, and tc sounds are very nice subs. |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 1747 Registered: Jan-06 | I agree Neo but according to there site the extreme amount of BL there subs have which very high compared to my Treo SSX it would be very peaky which is good for a f@rt box but not a box you would play daily. They say for this they recommend a very small sealed box, even there 18's use a 3cf box which is extremely small for a sub that size. They also said any larger would add to this peakyness and it would use much more power. I am waiting on another e-mail I sent to them but I really like the quality of there subs not to mention the way it breaks down is awesome. Polo..  |
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Gold Member Username: Cenus4, 20 Post Number: 2407 Registered: Jan-05 | hmmm, interresting keep us updated i wanna hear more about this. |
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Silver Member Username: J_baby15Kentucky Post Number: 663 Registered: Feb-06 | Some of the ppl on their forum was recommendin me those, and for the 18 to go 2.5cuft ported and tune to the mid 20s. The Fs is also really really low on most their subs. |
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Gold Member Username: Basshead86Try Google Post Number: 7582 Registered: Aug-05 | BL could be combated with a stiffer suspension/surround....the air compliance in the ported box should also help with that....i dunno. lol |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 1763 Registered: Jan-06 | They did say that you could go ported but the size ofit would have to be soo small that it would be negated. I would just buy one to try it but they ain't cheap, lol. Polo.. |
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Gold Member Username: Basshead86Try Google Post Number: 7590 Registered: Aug-05 | they being TC???? they know their stuff mang..... |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 1765 Registered: Jan-06 | Ya but do you think it would be possible to hit between a 150/151 with two sealed 15's with an extreme BTL of 45+ on 2500 rms each? This would be with the trunk sealed off of course? Polo.. |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 1766 Registered: Jan-06 | BL |
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Gold Member Username: MixneffectOrangevale, Ca. USA Post Number: 1122 Registered: Apr-05 | BL is a unit of measure of how much impact (force factor) a speaker has. So a speaker with extreme BL would hit very hard. Now; A ported box usually limits speakers due to its exhaust pressure at the port. When you oversize a box so that you will get lower bass out of your ub, you will change the air pressure inside the box and the port. This will limit you on how much power (watts) you may drive into your sub. This is because the air pressure in a large box is low and therefore the sub will prematurely bottom out, especially down low (Hz). So yes, a sub with extreme Bl will bottom out in a ported box faster than in a sealed enclosure due to air pressure inside the box, AKA enclosure compliance. Oh yeah, port noise city too...  |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 1769 Registered: Jan-06 | Gotcha, makes good sense so in out ported world that sub would be useless? The one's I was looking at had an excursion of 30mm one way and the LMS had 38mm. With the increased level of BL of these subs should allow for decent output but could it be possible to hit the above numbers, sealed? Polo.. |
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Gold Member Username: MixneffectOrangevale, Ca. USA Post Number: 1125 Registered: Apr-05 | No, it wouldn't be out of the question to go ported as long as you dont go ported and large. Sealed give you less output down low, buit it allows you to run the drivers at full power without bottoming out. I would just run them ported, but stay small. This would keep the air pressure up, and the drivers would be in check. |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 1790 Registered: Jan-06 | You say stay small, meaing port or box? Polo.. |
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Gold Member Username: MixneffectOrangevale, Ca. USA Post Number: 1126 Registered: Apr-05 | Keep the box small, but not too small. Just stay away from a large ported box. For example if a driver has 3 allignments; 1 CF* F3=45 Hz 2 CF* F3=35 Hz 5 CF* F3=25 Hz Then I would chose the 1 or 2 CF* boxes, and definetly not the 5 CF* box. The smaller boxes would not push you over the limit and bottom out the subs, but the large one will. The port is up to you. If you use a narrow port of say 2" wide, then the length would be short, say 3-5 " long. If you chose a wide 4-6" port, then the length would have to be about 20-30" long. This is because of pressure. Basically, no matter the port diameter. The air pressure must be the same in order to tune properly. The port just fine tunes a certain frequency. It does not allow a sub to get a lower F3. The box size determines that. |
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