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(IDEA) Is it ok to strap 2 (unknown mono amps at this time) to a box. With 2-P310D4 DVC ( 400wrms) ea.(I have these already) wired in parallel separately for each to have a 2 Ohm load. So each mono amp would be driving 1 of the subs in the box. The amps would have preamp outs for strapping. I can't get the good amp I want, so I am thinking of getting two cheaper mono D amps and strapping them to each sub in the box to get the power at about 100% of the subs capabilities. I know that they would both be in mono mode, but that's ok. I also realize it would be better to have one big sub and one big amp but my fuduciary plans won't allow that. (THINK) This is a new plan again, dang, 4,000 a year sucks big time, but I am having fun at it. Any comments and help or suggestions for the plan of the future will be greatly appreciated and welcome. thanks peeps marlon Replies (18) swez on 09/12/2009 09:56:25 There are several good Class D amps out there that can deliver close to 1000 watts at 1 ohm loads. Check out the HiFonics Brutus selection as these are not very expensive and have all the features and power you'll need for those subs. http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=20598 http://www.caraudiodeals.com/hifonics-bxi1210d-p-1979.html http://www.maxxsonics.net/manuals/hifonics/pdfs/HifonicsBrutus2009AmplifierManual.pdf (Manual for Bxi-1210D Mono amp) This amp is stronger than needed but it can be adjusted to deliver 800-1000 watts of bass power at 1 ohm loads. (They rate it at 1200 Wrms @ 1 ohm) It also has an adjustable SSF/IFS filter built into the preamp. What say you? Swez fmarlon on 09/12/2009 13:16:29 I'm checking em out right now,,thanks How do you feel about a Cadence ZRS-2002 $269.00 (onlinecarstereo.com) 2 Ch. 390 wrms x 2 ch @ 2 Ohms. I heard Cadence was aok. ? There is a Cerwin Vega $330.00 mono block D , Stroker 1000.1 ,,,1000wrms x 1 @ 1 Ohm that would do the trick also..??? Last a Boston Acoustics GT-28 2 ch marked down from $999.99 to $298.15,,,350wrms x 2 ch @ 2 Ohms. that would work awesome...???? next week might be a good week after all( CLAP) marlon swez on 09/12/2009 22:17:41 I'm trying to steer you to a Class D amp that is 1 ohm stable, of above average value and something in budget. Please... avoid 2 channel type Class A/B amps for your subs as they pull more power and less efficiency to feed your Bass Engine on a limited budget and a modest ALT. Cadence and BA are both solid products, but the watts per dollar are not working in your best interest. A'm showing you a proven line of Class D amps that will fo the job and then some, but not smash your wallet of power consuption limits. See where I'm coming from? (After 10 years on this forum, (Many years in Pro Audio too) have researched many products and try to meet/exceed the needs w/o deflating the wallet) Trust me... as I am not asking a dime and only look for the best solutions our readers can use in/below their budget. Do you see that? Swez fmarlon on 09/13/2009 00:07:40 I see where you are at and I trust your confidence in your knowledge. Hifonics, I just wasn't sure about them. I do know that class D mono blocks use less voltage and deliver more output. They also seem to be more $. On a different note, I always thought 2 ch meant stereo output, even for subs, so I have been thinking that way. You know, keeping everything in stereo, including the subs. Are subs not able to reproduce stereo reproduction sound from the HU and throught a 2 ch amp? I love stereo sound! So, I have been willing to lose some voltage for it. I figured mono amps only produced analog through a single channel output. Is this not correct? I feel more great advice and insights coming my way soon...(SMILE) I did the research on those 2 ch amps ( and many others too) and the cv last night like every night looking over new things. Thats kind of what I like to do. Looking forward to your response. marlon swez on 09/13/2009 07:32:05 Dual or multi-channel Class A/B amps are the right target for full range use. (MB/Mids/Highs) They don't need so much power to get the SPL levels up to concert levels. That's also where good staging comes into play. (Left/Right imaging) Bass is a different animal. Few systems in mobile audio benefit from stereo bass as these frequencies are omnidirectional. They propagate sound waves so well that it's often difficult to get a bead on the location of the subs. (The bass seems to come from everywhere in the cabin) Also, bass is generally recorded equally on both channels. A mono amp just sums A & B channels at low frequencies, (Below 200 Hz) and that's all she wrote. That's why Class D Mono amps are a great choice for subs and the side benefit is lower current draw from the electrical system. (See how they all work together?) BTW: CV and Cadence make some very solid products. (Amps, speakers, subs and signal processors) Both have been around a long time too. The Stroker 1000.1 would be a very good option too. I believe it also has SSF as well. These amps are brutes and expect to pay more for that brand. Comments? Swez fmarlon on 09/13/2009 07:58:42 Yes, I understand paragraphs 1 and 2. I didn't realize the generality of recorded bass per channel. Makes perfect sense now though. It might be another month or two befor I am able to get something, but I am all over your advice and comments. More options, more better...will keep you up to date on my next move though, that's for sure. Thanks very much for the lessons.... Marlon swez on 09/13/2009 18:20:32 A few guys here have mentioned a few bass tracks that employ L/R signals that are unique to each channel. I have not heard any to date and if there is a difference, headphones or HT systems would make the most sense in that scenario. (HT using L/R subs and separate amp channels) Also, we do some live sound/club DJ gigs and always run the subs in Mono, no matter how many subs are used and how far apart they may be, it's a wash of bass in the whole room to keep phase issues to a minimum. The same is true when mixing tracks for bands my brother is working with. After all tacks are compiled and sync'd, bass and kick drum are always in both L/R tracks on equal sound levels. Finally, some drummers will use dual kick drums, floor toms and miked for 2 channel assignments. This is rare, but can be done. The entire track files are difficult to manage as in the end, most master mixes combine the deep lows to L+R anyway. Hope that helps, Swez fmarlon on 09/13/2009 20:50:38 Yes, I played with a mixer with my friends when they were a band or two in the late 70's and early 80's in Portland Ore. They were called Morris ("the cats with discriminating taste") ripped that off from the commercial. Then they were called The Quest. ,even more fun... Didn't really know what I was doing, but, I tried because the reg guy got some other gig with another more succesfull band. I mostly helped get people on the dance floor...kind of a honorary invovlement director (free beer). They played biker bars and the such. It was a lot of fun though. I tried to learn stuff then. Nobody has ever explained this to me befor so-..do'h. I just love music and yesterday I completed two steps of the big three. Both grounds. For some reason my car seems to run smoother? Must be the bigger grounds. I built the alt (+) to bat (+) last night (2am) and should have it in today or tomorro. I designed and installed a super grounding block platform thing for my amps and installed that yesterday. It's a 1/2" sm plank of high grade aluminum about 6 x 8" bolted to the cleaned bare metal of the rear deck where my amps are. I am moving my amps off of these metal sheets I made for them out of old pc sides and putting them on a particle board that spans from side to side my rear deck abut 12" deep by 3/4" thick. With room for one more amp in the future and mounting room for other stuff also. My run will eventually be 1/0 to the rear dis block and then to the amps. I am going to use a cap later on, it just makes sense to me. For near future consideration: A big question I do have is: Part A: What is the deal with running two like batteries? Part B: If I removed my air conditioning pump, I could mount another 100 amp alt. there. How would that be? Part C: I've seen some Stinger (and other models) of 200/300amp etc. isolators/relay's http://www.hifisoundconnection.com/Shop/Control/fp/scat/39420/SFV/30046 What's your advice and comments on these things. When you have time, I would be gratefull to hear your input. thanks a bunch. marlon swez on 09/14/2009 09:20:38 Battery Isolators are used in many ways for RV's, Watercraft and even car audio systems. They monitor dual battery power levels and direct ALT charging to the batteries as needed to keep all batteries in the system charged to appropriate levels. The Solid state version with diodes and such, have a down side as the diodes drop voltage to the batteries by about 0.5 volts. This is tolerable for some applications, but in car audio, we have a small window of voltage loss that needs to be minimal. The solinoid type isolators do not drop voltage as they are mechanical switches that only require a small amount of power to activate the solinoid coils that switch from ALT to Bat #2 as needed. These have negligable voltage drops and allow more voltage to BAT #2. These solinoid types are often used with a relat to turn on the current flow through the solinoid coil. That's the overview of how Isolators work in a given system. FYI: Alternators do not produce maximum charging rates until they get above 2,000 RPM, At idle speed, they deliver about 50% of rated power and as the ALT spins faster, the power curve rises with RPM. To overcome that, some guys will drop to a smaller pully diameter to allow the ALT to spin faster at low RPM's. This helps reduce light dimming at night and feeds the entire system more wattage as needed. Yes, there's more to it, but that's the basics of how these things work together. If you want more details, have a look and read this: http://www.bcae1.com/charging.htm http://www.bcae1.com/battiso.htm Happy reading, SMILE Swez fmarlon on 09/14/2009 12:04:37 yep, I am aware or the solenoid type isolators and what they accomplish. That's probably the way I would go if I ever go that way. I also am aware of the alt rpm charging rate. Good point. I won't have that kind of need for along while, but I always like to be prepared or know someone who knows the ins and outs of these sort of installments,,well,,,kind of like you ! I don't see going that way in the near future but for laughs and giggles, if the topic comes up in the neighborhood I might have better info. And I also know the web address to here for that matter to pass along, first and foremost. This site is prime grade AAA beef, then I like the12volt.com for its line of quick and easy topics and solutions, then comes DIY Audio and Video.com, they have an awesome link to audio manufactures and a lot of the stuff like the12volt.com. And a few other so-so forums are ok. I'll check out these links and study them and you know "knowing is half the battle". thanks so much for your time and effort Dave. marlon swez on 09/14/2009 21:33:31 We relish good students and you my friend... are a breath of fresh air! Keep up the good work and you could wind up being part of our Q&A answer team. That does not require a donation from guys that are just making ends meet either. Guys who pitch in, help others and promote the site, are good candidates for getting a few kudos and move up to the Gold Medal designation in time. FYI: We've, (CK Admins and fellow Golds) have talked about Bronze, Silver and Gold Medallions to represent site level activity, general knowledge and willingness to guide/teach other. If that's something you'd like in the future, you're on the right track! CLAP Swez fmarlon on 09/15/2009 10:02:50 Oh, thanks for the encouragement. Any little thing I can help with I would sure enjoy. We just need a little guidence and good advice. I know how it feels to not know what to do...or how to do it. marlon swez on 09/15/2009 15:52:20 Same here... the new job is full of pot holes, potential blunders and a lot of unwritten rule and regulations that seem to go against my grain. After many years as an independent Sales Rep and contractor, being micro-managed by others is not an easy mind shift. There's no place to hide and think things through in a busy retail store. It's just go... go...go all day. On a slow spell, best to keep busy and remain alert for the pot holes. If the store manager sees us idle for too long, he's quick to give out additional assignments. He's a very on top of things kind of guy and that why his store is the cream of the crop compared to our other stores in the state. (Good guy in all, but very picky and to the point about how things are done in his domain) Can you tell I don't like too many rules and pot holes? GRIN Swez fmarlon on 09/15/2009 20:52:37 Yes, that's a tough thing to deal with daily, but, it has done wonders with your charachter and personal growth. I think we are who we are, not what we are. Our strenght of heart and spirit are eternal. In the end, it's just who we are always going to be, no matter what. marlon swez on 09/17/2009 09:45:24 Indeed! The goals and objectives have been overall positive it the past and the potholes and such help one to see the need for refinement and adjust as we go. Yes, it's getting better and ones true character and values tested at times when we get into sticky situations. (Do we know what is the right thing and do it consistanly or ignore the "trivial details" and pay a price later?) In this case, it's best to do both the trivial and the big things well. I've never been in the military, but it would have "make or break scenario a guy like me. I can't stand... no, I won't tolerate doing trivial things just for the sake of traditions that have little impact on the bottom line. The 80/20 rule and some good gut instints have always been a sound method. 80% our our outcome is from doing the 20% priorities well. The rest is just chattle and nonsense. Unfortunately, some managers demand it all. (110% effort is the goal) For now, I'll just suck it up, do my best and try to be a good soldier in the process. This type of training may come in handy for the next assignment too??? (Ya never know in times like these) It's all good though. More good days that bad are a step in the right direction huh? Swez COFFEE fmarlon on 09/17/2009 14:55:06 Certainly, rewards are not often seen immediately, if ever. But I try to beleive in the long run that this "extra" effort is always worth the sacrifice. It's should always be part of who we are or who we want to be. The shinny penny stands out eventually !!! And its value is always real. marlon swez on 09/19/2009 21:44:35 I love that comment... "The shiney Penny stands out eventually" and it is indeed proving true. Those who go the extra mile and just wait until the timing is right, do get the perks and satisfaction of a project done well. Even when it "seems that nobody" is watching or offering kudos, we can give ourselves some kudos and let things take their natural course. A task done well, speaks for itself. Doing it consistantly will make a difference and that's my game play. We are actually play to an audience of ONE. The rest does not matter nearly as much huh? Good thoughts there Marlon, Swez fmarlon on 09/22/2009 13:31:23 Thanks, marlon Copyright ClubKnowledge 2009 * All Rights Reserved |