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Bronze Member Username: InvainMichigan United States Post Number: 67 Registered: Aug-04 | Ok, here's the deal. I have a 12" dual 4 ohm voice coil sub, that has a freq. resp. of 20hz - 500hz, that will be going into a slot ported box tuned to 38.2hz. The amp pushing the sub is a MTX 311D, with a frequency response of 20 - 85hz, Low-Pass Crossover Frequency 85Hz, Low-Pass Slope 18dB. I know the crossover is only pretecting the sub against higher frequency's, I think, but what I know I need is a sub sonic filter, since the sub is in a ported enclosure. So what exactly do I need? |
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Bronze Member Username: InvainMichigan United States Post Number: 70 Registered: Aug-04 | anybody? |
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Silver Member Username: InsearchofbassPost Number: 282 Registered: Jun-04 | those subsonics are only 18 db per octave too so it wont be any better than your crossover you have if its 18 db per octave just adjust the frequency on the amp |
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Gold Member Username: Jonathan_fGA USA Post Number: 1373 Registered: May-04 | Harrison Labs FMods, the one closest to your tuning will be the 30 hz one. |
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Silver Member Username: InsearchofbassPost Number: 286 Registered: Jun-04 | jon arent they just 18 db per octave so wont help any better than his factory crossover correct? |
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Gold Member Username: Jonathan_fGA USA Post Number: 1378 Registered: May-04 | His factory crossover is a low pass filter, and he needs a subsonic filter, which is a HPF, so that he doesn't damage the sub below tuning. |
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Silver Member Username: InsearchofbassPost Number: 289 Registered: Jun-04 | ok ty |
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Bronze Member Username: InvainMichigan United States Post Number: 72 Registered: Aug-04 | Is this what I need then? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=14931&item=3076531712&rd= 1&ssPageName=WD1V |
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Silver Member Username: InsearchofbassPost Number: 344 Registered: Jun-04 | 30 hp yes according to jon |
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Gold Member Username: Jonathan_fGA USA Post Number: 1401 Registered: May-04 | That's the one. |
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Bronze Member Username: InvainMichigan United States Post Number: 73 Registered: Aug-04 | thanks guys! |
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Bronze Member Username: InvainMichigan United States Post Number: 74 Registered: Aug-04 | By the way, since the fmods come as pairs, 1 high pass and 1 low pass, what should I order the low pass set at? I have to specify what I want for the low and high pass frequency's. |
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Bronze Member Username: InvainMichigan United States Post Number: 75 Registered: Aug-04 | anybody? |
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Bronze Member Username: InvainMichigan United States Post Number: 78 Registered: Aug-04 | ? |
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Bronze Member Username: InvainMichigan United States Post Number: 79 Registered: Aug-04 | ? |
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Silver Member Username: InsearchofbassPost Number: 349 Registered: Jun-04 | high pass ....thats what i meant by hp |
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Silver Member Username: InsearchofbassPost Number: 350 Registered: Jun-04 | sorry thoght you were confused about my earlier suggestion disreguard that one |
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Bronze Member Username: InvainMichigan United States Post Number: 80 Registered: Aug-04 | No, I meant the fmods come in pairs, 1 hp, and one low pass, I know that I need a 30 hp now, (thanks by the way) but I need to know what I should order the lp to be set at. |
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Silver Member Username: CaraudiofngHouston, TX Post Number: 203 Registered: Aug-04 | You don't need a low pass....the amp has that built in. |
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Bronze Member Username: InvainMichigan United States Post Number: 83 Registered: Aug-04 | OK, you don't get it. I am ordering Harrison Labs Fmods, a pair, one low pass and one high pass filter. When I order them, I have to specify what i want them to be set at. I am running my sub in a slot ported box, so I need to get a hp filter. I am going to order the hp to be a 30hz, but what should I get the lp set at? I meen, I have to get the lp also, they come in a pair. And I know my amp has a lp built in. But what should I get the lp fmod set at? |
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Gold Member Username: Jonathan_fGA USA Post Number: 1432 Registered: May-04 | Both of them should be high pass 30 hz, you'll need one per channel. That picture is just for showing the difference in color rings. |