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Monoblock hook up to 2-12" subs.
by Dougeb214
Start New Question Here -- Back to TreeYear Make Model: 1993 Ford Crown Victoria LX What is the best way to connect my Performance Teknique ICBM-DIGITAL monoblock to 2-12" subs and keep from blowing them? The subs are low class VR3s with a peak rating of 750 each and 250 rms. My deck is a Sony Explode CDX-GT08 FM/AM/CD pushing a wimpy 190 watts.
Reply Posted: 10/3/2009 19:37:15 by: Dougeb214 By the way the model of my subs are VSW120
Reply Posted: 10/3/2009 21:00:55 by: 
swez Old Man Audio
These subs?
http://roadmasterusa.com/product.php?p=VSW120
The Performance Teknique ICBM-DIGITAL amp will shread these subs in no time at all. An option to prevent this, is to use one channel, wire the subs in series/parallel for a net load of 4 ohms to Channel A on this amp.
If you have the space, consider a 2nd pair of matching sub for Channel B on this sub amp. These subs are not very robust and too much RMS power will fry them in short order.
Finally, a stronger set of subs are recommended with this amp and since this amp is strongest when bridged MONO. A pair of 2+2 would be your best option for this amp. (400 - 500 watts RMS per sub will net a strong Bass Engine if you have the cash to do so)
What say you on this matter?
Swez
Reply Posted: 10/4/2009 00:18:45 by: Dougeb214 Thank you I will try that. I will be buying better subs soon, but, I am more than anxious to get some beats back in my car. What would you say is the best settings for the level, bass eq, bass freq, and low pass. I am very new to the bass building family and I feel almost overwhelmed. Here are the choices I have for settings. Level: 6V thru 0.2V, Bass EQ: 0db thru 18db, Bass Freq: 40Hz thru 120Hz, Low Pass: 35Hz thru 250Hz.
By the way I am planning to buy 2 Boss Car Audio D125DVC "Diablo Series" 12" Dual 4 OHM Car Subwoofer 1200 Watts. Here are the specs: Power Peak: 1200, RMS: 600W, Cone Material: POLY INJECTION, Magnet Structure: 120 oz, Voice Coil Size & Type: 2, Efficiency 1 Watt/1 Meter: 95 dB, Frequency Response: 28Hz-2kHz, Impedance: dual 4 ohm. I know they will handle the wattage, but, are 4 ohms good for my amp?
Reply Posted: 10/4/2009 07:58:31 by: Before moving forward on this project, let's get the amp specs for the amp you have now. What is the product number of the Performance Teknique amp you have now? Is it this one?
http://www.sonicelectronix.com/item_2797_Performance+Teknique+ICBM-DIGITAL.html
SwezReply Posted: 10/4/2009 10:16:53 by: Dougeb214 Yep that's the one. I bought it used so I don't have the remote. I am already running the required 4 gauge power and ground from my previous amp. I am running 18 gauge for my speakers.
Reply Posted: 10/4/2009 10:42:27 by: you may want to consider looking at another sub. There are plenty of other subs on the market in about the same price range that i feel will out perform the bos audio subs hands down.
your amp is pushing out 350w x1 @4ohms, or 700wx1 @2ohms,
getting a nice set of dvc 4 ohm subs for about 80-100 bucks would be the way to go in my opinion..a sub that handles approx 200w rms, wiring them in parallel to net you a load of 350w@4 ohms on both of these subs, or 175w per sub. the other option is to go with a single sub, spending a greater amount on one sub and wiring it to cooperate with your amplifier. remember, two subs does not always necessarily make more bass.
another thing to consider, the freq response range on those boss audios is from 28hz to 2khz, that a wide range and without limiting what your amp is pushing to it, it will be pumping out some high notes right along with those bass notes, consider something with a freq range of 20hz area to 400 or 500, i personally like them around 250 hz maximum, but to each his own.
Reply Posted: 10/4/2009 11:17:27 by: Dougeb214 Thank you Tinker. I am looking at more subs other than just the Boss. Those are just one of my top choices. I didn't think about going with a single sub. I am really looking for a hard hit as well as super high SPLs. I know I can spend thousands in order to get it, but, like with everybody, the economy says what I can do. By the way I forgot to mention that my subs and amp are in my trunk. My trunk has been factory sound deadened so getting a lot of the hit inside is tough.
Reply Posted: 10/4/2009 11:43:04 by: i understand, the economy has affected everyone as of late...
what does your budget look like and we can go from there,
on the contrary, the subs being in your trunk is a good thing, as it provides more options for enclosures.Reply Posted: 10/4/2009 15:47:58 by: Dougeb214 Well for right now I am looking at about maybe a couple weeks before buying more subs. I am willing to go as far as $100, but, they need to be good. I found these that look awesome, but, like I said before I am very new to this. http://www.cardiscountstereos.com/catalog%20page.asp?Product+%23=SP312 . The look great as well as have massive capabilities. Those would be if I choose to go with just one. If I go with 2 I like the Boss and these. http://www.cardiscountstereos.com/catalog%20page.asp?Product+%23=MAX12D . My current enclosure is an angled ported box with slightly than larger area than the recommended minimum for 12s . It has an angle of 65 degrees and the base measures 40" wide by 22" deep by 16" height in back and 6" in front. It is evenly separated with each speaker having it's own area. I used 3/4" MDF to build it. Each port is 2 1/4" X 10". It is possibly more than what I need, but, I spent a lot of time building it and am a little attached to it.
Reply Posted: 10/5/2009 10:36:43 by: Ran your numbers and it appears that it's about 2.0 cf per chamber. Then we subtract the sub and port displacements. That looks more like the box is now 1.8 cf. (Tuned to about 22.5 Hz.) That's not a good match either.
The ports are too small in diameter for high SPL Bass and will likely yield excessive port noise problems at high volum levels. Here, you might want to consider using 4" diameter ports to reduce the potential for port noise.
For now, it would be wise to wire each Roadmaster sub in series for a net 4 ohms to the amp. That will prevent damaging them and upgrade to stronger subs later when your funds permit.
Also, going to larger subs and 4" ports will change the internal airspace and tuning frequency of the box as well. Some careful planning and stronger subs can save your box with a few minor adjustments. (Port dia., and length)
To get the most from the amp you now have, consider a pair of 4+4 DVC's that can handle ~400 -500 watts RMS per sub and wire them to that amp for a net 1 ohm load.
Finally, looking for the right subs will be a challenge in your budget range. We'll try to hep you there, but it may require you to hold off on buying new subs until you have the budget to do so.Reply Posted: 10/5/2009 18:16:40 by: Dougeb214 Thank you very much swez. I will redo the ports this weekend as well as rewire the subs. I found some schematics in one article here: http://www.clubknowledge.com/Car_Audio_FAQ/?t33
Is one of these schematics the one I should use for the wiring for a net 4 ohm? Also, is 18 gauge speaker wire enough for my rewire?
As far as upgrading my subs. I can go a little higher, but, not much. I kinda want to stay away from the higher end name brands like Punch or Alpine. I do however like Rockford Fosgate. Yes it does go against wanting to stay away from the higher name brands, but, I have heard what they can do and it is insane. Again, thank you so much swez and Tinker18. You both have helped me a lot!! I will be donating immediately as soon as my funds free up. I love this site!!!
Reply Posted: 10/5/2009 19:00:15 by: For sub wiring in this power range, #12 wire is plenty good if the terminals on the sub can accept that gage wire. (#12 gage is good up to 2400 watts RMS of AC signal at 100% duty cycle)
Am trying to find moderate budget subs that meet the enclosure specs you have now and not break the bank, fit your box and still sound solid and deep with bass. HiFonics subs mights be a good fit here. We just have to find the right sub for the box you have now and priced right for your budget.
http://www.woofersetc.com/p8196/HFi12D4--Hifonics-12"-600-Watt-Dual-4-ohm-Subwoofer.htm
Swez
Reply Posted: 10/23/2009 01:36:25 by: 07chargedup its a lot of specials out the dougeb214 like 2 kicker comps for 100 2 kenwood wo12 for 130 or try just one i just one type r alpine 12 for 130 and hey check ur local craiglist i just caught a major deal on a mtx thunder 9500 for 125
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