the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

Best way to power 1 SVC sub with 4 ch amp


Post ReplyPost New Topic
< Prev Topic Next Topic >
parad0x 
Member - Posts: 41
Member spacespace
Joined: December 09, 2005
Location: Canada
Posted: December 09, 2005 at 9:29 PM / IP Logged  

The specs of the amp + sub, are down below.      My question is, how can I set this amplifier up the best way, to get the most power out through to my one 15" SVC 4 Ohm Subwoofer.   I am curious if I am able to use all 4 channels on this amp for this one subwoofer or not? Would I need to at all, or would I get most of its power from 1/2CH without touching 3/4?  Dont know what im doing, so help me out guys ;)

amplifier

-----------------

THUMP T5406 800-WATT 4 -CHANNEL AMPLIFIER

"Specifications 800W

4 X 100W RMS @ 4?

STEREO, 4 X 150W RMS@ 2?

STEREO 2 X 200W RMS @ 4?

MONO FULL MOSFET CIRCUITRY 2?

STEREO STABLE, 4? STABLE BRIDGED ADJUSTABLE GAIN CONTROL REGULATED POWER SUPPLY YELLOW ANODIZED HEAT-SINK BLACK CHROME CHASSIS SPECIAL FINS FOR ADDITIONAL COOLING 3-WAY PROTECTION CIRCUIT GOLD-PLATED TERMINALS THD 0.05% DIM: 10.5W X 2H X 7.75L"

This above amplifier, with the below subwoofer (manual was hard to read, so might be a few typos).

Heres a picture of the actual channels, and the bridging diagram next to it.

Best way to power 1 SVC sub with 4 ch amp -- posted image.

--------------------------
SVC 15" 4 ohms subwoofer
Phoenix Gold XS154
Revc (DC VC res) 3.34 ohms
1evc ( inductance@1Khz) 2.27 mH
Res Freq 19.77Hz
Piston Area 0.081m^2
BL (Flux Length) 12.88TM
SPL0 (SPL @ 1W) 91 dB
Qms (Mech Q) 4.74
Qes (Elec Q) 0.39
Qts (Total Q) 0.36
Vos (Acous Vol) 387.58L
Cms (Compliance) 416pM/N
Mms (Total Mass) 155.85g
P8 (Thermal Power Handling) 300W
Xmax 7.5mm
Vc (Voice Coil Diameter) 2.0in
Vdd (Driver Displacement) 385in^3
Mounting Diameter 13 7/8 in
Mounting Depth 6 3/4 in

menace2sobriety 
Silver - Posts: 394
Silver spacespace
Joined: October 29, 2005
Location: United States
Posted: December 09, 2005 at 9:54 PM / IP Logged  
no you cannot use all four channels to power that sub. unless you like total distortion? only use two channels and it looks like the sub is rated a 4ohms so no impedance problems. either use the front or rear channels of the amp. and run the sub in bridged mode. looks like at the right hand of the terminals it shows you how to do that. i think thats what the diragram is showing.
parad0x 
Member - Posts: 41
Member spacespace
Joined: December 09, 2005
Location: Canada
Posted: December 09, 2005 at 11:02 PM / IP Logged  

menace2sobriety wrote:
no you cannot use all four channels to power that sub. unless you like total distortion? only use two channels and it looks like the sub is rated a 4ohms so no impedance problems. either use the front or rear channels of the amp. and run the sub in bridged mode. looks like at the right hand of the terminals it shows you how to do that. i think thats what the diragram is showing.

Hey thanks for the response!   But few questions if I may ask.  One being, why would I get Total Distortion from bridging all the channels?   what would be the cause of that?  Is it not possible to bridge Channel 1, to channel 4 on this amplifier?  I keep reading somewhere that lowering ohms on some amps will give out more power? In some cases I heard some people suggesting running an amp set at 2 ohms for a single subwoofer rated for 4 ohms?

I mean, if I do what you are telling me to do, which is use only 2 of the 4 channels, and bridge those two channels.. Would I only be using Half of the potential power of this amplifier?  Since I would only have CH1 and CH2 bridged into one?   And if this is the case of what I have to do.. What should I set the manual MODE to?  (2CH / 3CH / 4CH) I take it switch it to 2CH? 

jlord16 
Silver - Posts: 322
Silver spacespace
Joined: September 08, 2005
Location: Australia
Posted: December 09, 2005 at 11:34 PM / IP Logged  
An amp isnt set at an ohm rating rather it has a tolerance range.  The subwoofers determine the resistance.  If you have an amp running a 4ohm sub you will be looking at the amps RMS @ 4ohm if the sub is 2ohm then you look at the RMS @ 2ohm.  By the looks that amp is only 4ohm stable in bridged mode (for sub operation) and 2ohm stable for stereo operation (speakers).  Basically yes the subwoffer would only be receiveing half of the amplifiers potential power the rest of that power would go to the other channels which could be used to power a sub or 2 speakers.  Hope this helped Best way to power 1 SVC sub with 4 ch amp -- posted image.
Clarion DB36MP
Infinity Kappa Perfect 10"
Respone 800w Mono
ALPINE MRP-F250
*Custom fabrications*
parad0x 
Member - Posts: 41
Member spacespace
Joined: December 09, 2005
Location: Canada
Posted: December 09, 2005 at 11:43 PM / IP Logged  

jlord16 wrote:
An amp isnt set at an ohm rating rather it has a tolerance range.  The subwoofers determine the resistance.  If you have an amp running a 4ohm sub you will be looking at the amps RMS @ 4ohm if the sub is 2ohm then you look at the RMS @ 2ohm.  By the looks that amp is only 4ohm stable in bridged mode (for sub operation) and 2ohm stable for stereo operation (speakers).  Basically yes the subwoffer would only be receiveing half of the amplifiers potential power the rest of that power would go to the other channels which could be used to power a sub or 2 speakers.  Hope this helped Best way to power 1 SVC sub with 4 ch amp -- posted image.

Yeah it does help, thanks.. Man I dont have a 2nd subwoofer though! 

And just for a final clarification.. Your saying, no 4 ohm subwoofer can be driven at 2 ohms, and no 2 ohm subwoofer can be driven at 1 ohm?  That's a pretty big misconception I hear everybody making then.. Here is an example of one..

I hear people asking for the most power setup for a one 4 ohm sub with their amp..

Then somebody replys and tells them to run their sub at 1 x  400RMS @ 2 ohms for most power. 

am I just miss interpreting something or what?

menace2sobriety 
Silver - Posts: 394
Silver spacespace
Joined: October 29, 2005
Location: United States
Posted: December 10, 2005 at 12:36 AM / IP Logged  

you cannot make a svc 4 ohms sub 2 ohms it will take 2 4ohms subs to make a 2 ohm load on a amp. or one dvc 4 ohm sub   (svc=single voice coil) (dvc=dual voice coil)      if you are just going to run 1 sub then switch it to 2 ch if you are going to run a sub  and a set of mids switch it to 4 channel. it should say on the amp or owners manual how to bridge the amp for mono operation. some amps are R- L+  others are R+ L-

thump amps are a low quality brand. use it for now and save up for a nice class "D" amp        if that amp is rated lets say 300 watts rms mono. you are more likely to get about 170 watts rms. and carefull with setting the gain on that amp. its more than likely to clipp easy.

Ravendarat 
Platinum - Posts: 2,806
Platinum spacespace
Joined: February 23, 2004
Location: Canada
Posted: December 10, 2005 at 1:11 AM / IP Logged  
menace2sobriety wrote:

use it for now and save up for a nice class "D" amp        if that amp is rated lets say 300 watts rms mono. you are more likely to get about 170 watts rms. and carefull with setting the gain on that amp. its more than likely to clipp easy.

I completly disagree with this statement. If your plans are to continue running a single 4 ohm sub and you decide to upgrade your amp I would suggest using a 2 channel amp. 2 channel amps are OPTIMIZED to run at 4 ohms where as D class amps are generally OPTIMIZED to run at 2 ohms. So it would make more sense to buy the amp that is OPTIMIZED to your current situation. What they are telling you is correct for wiring though, except you are going to bridge channels 1 and 2 together not channels 1 and 4. Thats what your picture shows at least

double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
parad0x 
Member - Posts: 41
Member spacespace
Joined: December 09, 2005
Location: Canada
Posted: December 10, 2005 at 1:41 AM / IP Logged  
Ravendarat wrote:
menace2sobriety wrote:

use it for now and save up for a nice class "D" amp        if that amp is rated lets say 300 watts rms mono. you are more likely to get about 170 watts rms. and carefull with setting the gain on that amp. its more than likely to clipp easy.

I completly disagree with this statement. If your plans are to continue running a single 4 ohm sub and you decide to upgrade your amp I would suggest using a 2 channel amp. 2 channel amps are OPTIMIZED to run at 4 ohms where as D class amps are generally OPTIMIZED to run at 2 ohms. So it would make more sense to buy the amp that is OPTIMIZED to your current situation. What they are telling you is correct for wiring though, except you are going to bridge channels 1 and 2 together not channels 1 and 4. Thats what your picture shows at least

Ahhh, I think I get it..

so the amp adjusts to the ohms of the subwoofer, and when an Amplifier has the following rating;

1 x 200 watts rms @ 4 ohm

1 x 400 watts rms @ 2 ohm

For the first one, it would mean that the amp would have detected a 4 ohm load on that 1 channel (bridged or not) and will give off 200 watts rms..

As for the second line, it means the amplifier has detected a 2 Ohm Load on that channel (bridged or not) and is able to give off 400 watts rms.

Is this correct?

jlord16 
Silver - Posts: 322
Silver spacespace
Joined: September 08, 2005
Location: Australia
Posted: December 10, 2005 at 1:56 AM / IP Logged  

As menace2sobriety outlined u cannt run a single svc sub and any other resistance then what they come as, u need either mulpitple subs or dual voice coils.  The lower independance the more chance of distortion then at a higher independance.  That is correct parad0x but the amp isnt stable enough to be run bridged at 2ohm, it wuld more then likely sh!t itself.  While it is important to have an amp optimised for your sub a D class is always better.  It is more efficent and will usally consume less current then a bridged 2 channel.  Most D classes are optimised for 2ohm loads but they still have sufficent RMS at 4ohm especally compared to a A/B class 2 channel, but i wuld suggest staying with the 4 channel that uve got.  Bridge either channels  and 2 or 3 and 4 and use the other 2 spare chanels to run speakers in 3ch mode.

Technically the amp gives off the same amount of power but because the resistance is lower more power can auctaully be used by the sub.  Imagine swimming up a river with a mild current and strong current against you.  The mild current represents 2ohm resistance and the strong curent represents 4ohm resistance.  2ohm is just less resistance and allows more power to flow.  Note that this is a very simplifed example

Clarion DB36MP
Infinity Kappa Perfect 10"
Respone 800w Mono
ALPINE MRP-F250
*Custom fabrications*
menace2sobriety 
Silver - Posts: 394
Silver spacespace
Joined: October 29, 2005
Location: United States
Posted: December 10, 2005 at 4:54 AM / IP Logged  
Ravendarat wrote:
[QUOTE=menace2sobriety]

I completly disagree with this statement. If your plans are to continue running a single 4 ohm sub and you decide to upgrade your amp I would suggest using a 2 channel amp. 2 channel amps are OPTIMIZED to run at 4 ohms where as D class amps are generally OPTIMIZED to run at 2 ohms. So it would make more sense to buy the amp that is OPTIMIZED to your current situation.

yes they rate class d amps at 2 ohms. but they will not sound worse at 4 ohm or even 8 ohm for that matter. just loose power each time you double the resistance. i was suggesting a class d. because the are OPTIMIZED to run as a mono sub amp. and later on if he wants to add a sub that could be done without a problem.           anyhow about your question as far as resistance and power go. it is theory that at 4 ohm 100 watt amp will double its power in 2 ohm to 200 watts. but you take that same 4 ohm 100 amp  and let it see 8 ohms it will cut the power in half from 100 to 50 watts. some amps are more efficient at this than others.

Page of 2

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Sunday, April 28, 2024 • Copyright © 1999-2024 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer