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will I dammage subs if I under power them


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quick4321 
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Posted: February 03, 2005 at 5:16 PM / IP Logged  
I have 2 12" MTX 8000's SVC. The 8100D I have conntected to them is dying and i need to send it in for repair. Can I hook up a 75x2 MTX amp I have lying around to get by? Im thinking I bridge to 150watts and then run series to get the ohm load down and possibly squeeze enough power to push the two subs. I know it wont be anywhere near what the 8100d gives them but I dont want to lose sound while my amp is in the shop. What concerns should I have? I also have a alpine 45x4 running some fronts so I could use the alpine 45x4 to run the subs if you guys think I can get more power out of that and use the 75x2 to run my seperates? Comments and sugestions please.
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(4) ID V3. 12" Dual 2ohm IB setup
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bullman96 
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Posted: February 03, 2005 at 5:22 PM / IP Logged  
what is the impedance of the subs and how low of an impedance can the amp handle? you might want to hook each sub to each voice coil. other than the wiring, you wouldnt be able to harm the subs or amp as long as you dont push the amp beyond its limits and have it clipping. be very conservative with the gains.
kfr01 
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Posted: February 03, 2005 at 5:26 PM / IP Logged  
Sigh. I'll let someone else handle this fully. I don't have the time atm.
Short answer:
1) don't present lower than a 4-ohm load to that amplifier in bridge mode. It isn't stable < 4-ohms bridged.
2) Underpowering doesn't harm speakers. Distortion and clipping harm speakers. If you turn that small amp up too high you'll introduce distortion and clipping. Then you'll harm the speaker. Set the gain correctly. Never turn the volume past where you had it when you set your gain. You won't have any problem.
If, however, you decide to show off and crank it past that point, the amplifier will probably distort heavily, clip, and start damaging the speaker.
See: http://www.bcae1.com/2ltlpwr.htm for more information.
I could run a 12312412124w subwoofer with 1w and it would sound fine until I started turning up the volume too high. Conclusion, to paraphrase bcae1.com, under-powering doesn't harm speakers, careless behavior with the volume control harms speakers.
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bullman96 
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Posted: February 03, 2005 at 5:44 PM / IP Logged  
"ou might want to hook each sub to each voice coil. " meant to say each channel.
Teamrf 
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Posted: February 03, 2005 at 5:53 PM / IP Logged  
I agree..I had two Punch HX2's that wanted 500 watts rms..and I was using a bd500 on them. And they sounded great, and no damage was done to the sub, or amp.
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DYohn 
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Posted: February 03, 2005 at 5:55 PM / IP Logged  

quick4321 wrote:
What concerns should I have?.

Connecting the speakers to the amp so that the impedence load is high enough for the amp to operate safely and setting your gain properly are your only real concerns.

The idea that too little power unto iself will harm speakers is a myth.  Period.

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audiobass10 
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Posted: February 03, 2005 at 6:15 PM / IP Logged  
Agreed with the above info..as long as your running the amp at a safe load with the gains set correctly you wont run into any problems..underpowering a speaker will never hurt a speaker if set properly..you'll just have decreased output..that's all..sometimes 200 or so extra watts wouldnt actually be noticable to the ear..but in ur case it should since you have such a large decrease in power...no worries though.
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stevdart 
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Posted: February 03, 2005 at 6:32 PM / IP Logged  

Can I hook up a 75x2 MTX amp I have lying around to get by? Im thinking I bridge to 150watts

You're subs being SVC's, they are most likely 4 ohms each, so whether you link them in series and bridge or connect one to each channel they will indeed get 75 watts each.  Follow the good advice above in setting amp gain and controlling the volume knob and they should keep your system in performance mode until you get your sub amp back.

You can, though, run just one sub until that time.  If this scenario is yours:  the subs are isolated in separate chambers of the enclosure.  (The amp should make 300 watts when bridged with a 4 ohm load.)  If that's your case, disconnect one of the subs and bridge the other to the two-channel amp.  As long as the sub is spec'd to take 300 watts RMS, you'll possibly improve the SPL and overall sound.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
quick4321 
Copper - Posts: 115
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Posted: February 03, 2005 at 6:54 PM / IP Logged  
ok so bridging and series puts me at under 2ohm, which is bad. So two subs at 75wats each is the best I can do. 75 watts to a mtx 12", thats embarasing LOL. Thanks for the schooling!
Clarion DRX9255
Dynaudio MD130, MD140/2, MD160, MD170
(4) ID V3. 12" Dual 2ohm IB setup
EPX2 Symmetry w/ zapco line drivers
Monior 1 amps (2)MK2.120, MK4.70
Hifonics Colosus VII 1600x1
stevdart 
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Posted: February 03, 2005 at 6:58 PM / IP Logged  
No, series-wiring and bridging is at 8 ohms, which is why you still get only 150 watts out of the amp.  What about my 300 watt idea...would that work with your setup? Is the sub box separate chambers?
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
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