white4d96 Posted October 18, 2009 Report Posted October 18, 2009 I was looking at some cheap 6.5" subs on parts express for use as midbasses in my back doors when I got an idea: combine two pairs of those mids with some cheap tweeters (maybe these?) and make some crossovers for a DIY component set on a budget! HOWEVER I have no clue where to start with designing passive crossovers. I remember reading in a book that you need a resistor and a cap or coil or something like that, but IDK how to select what parts to block what frequencies. Is there a formula to figure this out? I like to do the math myself and if available check it with a calculator, call me a nerd if you will but it gives me something to do. I would probably run each woofer/tweeter off its own channel paralleled for a 2 ohm load. Thanks in advance for the help Quote Too many projects, too little time...
1992Chevy K1500 Posted October 18, 2009 Report Posted October 18, 2009 I remember a post on Crutchfield's forum a while back that contained a link to what you would need to do. I'll try and find it. Quote My comp setup (Not bad for what it is): HP Compaq Presario V6120US laptop with: 15.4" widescreen AMD Turion 64 X2 1.6GHz processor 2x1GB stick DDR2 SDRAM (667 Mhz) Seagate Momentus 500GB SATA HDD 128MB shared video memory Windows 7 Home Premium 64 bit 12 cell Lithium Ion battery (actual battery usage time: 6 hours) What it does: On a USB 2.0 Wireless card
1992Chevy K1500 Posted October 18, 2009 Report Posted October 18, 2009 Found a direct link. http://www.the12volt.com/caraudio/cross.asp Should contain all you need to know. Quote My comp setup (Not bad for what it is): HP Compaq Presario V6120US laptop with: 15.4" widescreen AMD Turion 64 X2 1.6GHz processor 2x1GB stick DDR2 SDRAM (667 Mhz) Seagate Momentus 500GB SATA HDD 128MB shared video memory Windows 7 Home Premium 64 bit 12 cell Lithium Ion battery (actual battery usage time: 6 hours) What it does: On a USB 2.0 Wireless card
Blackedout Posted October 18, 2009 Report Posted October 18, 2009 (edited) Bummer that almost all the tweeters on that site are 8 ohm tweeters... Go with Silk Dome tweeters: http://www.parts-express.com/pe/showdetl.c...tnumber=264-841 You would be better off spending more money on some quality tweeters.... Seleniums are nice. Tweeters are really what make the difference between loud highs, muddy highs, or ear piercing highs. I like Silk dome because they sound pretty smooth, in comparison to say Titanium dome tweeters... Edited October 18, 2009 by JDirty96 Quote Trunk Build Log
white4d96 Posted October 18, 2009 Author Report Posted October 18, 2009 I put a link to some 1" silk domes that were 4 ohm in the original post. Dunno how they would work, but figured I would throw a couple ideas out and see what you guys thought. The amp I was considering using has a 80Hz HPF, and my HU has 80-100-120-140-160Hz HPFs, so I was thinking a 2 or 3kHz low-pass on the mids and a similar high-pass on the tweets, what do you guys think of that? Quote Too many projects, too little time...
1992Chevy K1500 Posted October 18, 2009 Report Posted October 18, 2009 I think 3K low pass on the mids and 2K high pass on the tweeters would work. Give you enough overlap and still sound decent for the money you'd pay. Quote My comp setup (Not bad for what it is): HP Compaq Presario V6120US laptop with: 15.4" widescreen AMD Turion 64 X2 1.6GHz processor 2x1GB stick DDR2 SDRAM (667 Mhz) Seagate Momentus 500GB SATA HDD 128MB shared video memory Windows 7 Home Premium 64 bit 12 cell Lithium Ion battery (actual battery usage time: 6 hours) What it does: On a USB 2.0 Wireless card
white4d96 Posted October 18, 2009 Author Report Posted October 18, 2009 Also, do you calculate resistance by the resistance of the individual drivers or the whole set? i.e. if I run one set of wire to the woofers and another to the tweets off the amp do I assume a 2 or 4 ohm load? Quote Too many projects, too little time...
1992Chevy K1500 Posted October 18, 2009 Report Posted October 18, 2009 If they're on the same channel, use the resistance of the whole set. If they're on seperate channels, use the individual resistances. I think... That sounds right to me. Anyone else know? Quote My comp setup (Not bad for what it is): HP Compaq Presario V6120US laptop with: 15.4" widescreen AMD Turion 64 X2 1.6GHz processor 2x1GB stick DDR2 SDRAM (667 Mhz) Seagate Momentus 500GB SATA HDD 128MB shared video memory Windows 7 Home Premium 64 bit 12 cell Lithium Ion battery (actual battery usage time: 6 hours) What it does: On a USB 2.0 Wireless card
tacomabanga1986 Posted October 18, 2009 Report Posted October 18, 2009 (edited) heres a website with alot of good info that i useto use a long time ago might help but i unno http://www.bcae1.com/ Edited October 18, 2009 by tacomabanga1986 Quote here's a link to my system 99 toyota tacoma , 2 mtx 8000 1504's in a sealed downfire , 1000w memphis amp here's a link to my other system my 90 geo prizm test car heres a thread i got of new songs u can dl that are legal = Some Good Bangage/you Can Dl These Free And Legit
white4d96 Posted October 18, 2009 Author Report Posted October 18, 2009 ...holy god caps are expensive. I may just buy some premades from a comp set or something. Do you think I need an LPF on the mids? Or could I get away without one? Quote Too many projects, too little time...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.