400w rms amp

400w rms amp DEFAULT

Is 100W output on amp enough for 400W Sub

 

Someone

New member

Username: Illusionaryman

Post Number: 3
Registered: Nov-04

Posted on   

i have Alpine MRV-F357 Amp and connected pioneer TS-W252C 400W 4ohms Sub to output speaker Terminal that gives 100W at 4ohms.... will 100W output be enough for 400W Sub??? and is 1W on Amp Equivalent to 1W on Speakers??? and if the sub was 2ohms will the output on the amp be 50W (half) or will it increase???

any replys will be Appreciated?  

BadAzzBowtie

Silver Member

Username: Chevy_for_life

Post Number: 223
Registered: Sep-04

Posted on   

is 400 watts the subs RMS or peak?  

Ray G

Bronze Member

Username: Ohiopilot

Post Number: 32
Registered: Nov-04

Posted on   

Not all amps are designed to accept varying resistance. I don't see that model amp on the Alpine website, so I don't know it's specs. Remember these simple rules of thumb...

1. An amp has 3 basic ratings: Power, Channels, Resistance(s) Some amps allow bridging for certain resistances, some auto-sense, some don't allow bridging at all.

Both subs and amps have RMS power ratings and Peak power ratings. Pay attention to RMS, this is the rating that the manufacturer says the amp/sub can handle CONSTANT power at best, whereas Max simply tells you the biggest short-term blast it is rated to handle.

As for changing ohms by wiring parallel instead of series...an example will illustrate best.

Say I have a pair of Widget Imaginary brand Subs, each rated for 500W RMS at 4ohms resistance each.

If I'm shopping for an amp, I have a couple ways to skin this cat. One choice is to search for a 2-channel amp that is rated for 500W RMS at 4ohms on each channel. Simple enough.

Another option is to connect the subs in parallel, creating a virtual single load at 2ohms with a target of 1000W RMS. In this case, we can buy a single-channel (mono) amp rated for 1000W RMS at 2ohms.

A third option is to find a 2 or 4 channel amp that says it is Bridgeable to 1000W RMS at 2ohms. This particular example's stats are not that common, but it makes the point.

***IMPORTANT*** Not all mult-channel amps are designed to allow bridging. Not all amps are designed to work at different ohm resistances. Be very careful, contact an authorized Alpine dealer or call Alpine tech support directly, it will be worth the 15 minutes of your time to be sure you have everything kosher.

The simple rule of thumb for matching subs to amps: Pick your amp so that it is as close to the Sub's RMS power rating without exceeding it.

The first sub-rule is that all subs have a RANGE of safe operations on either side of the published RMS rating. I had a JL Audio engineer tell me that I could drive a little 6w0 "sub", originally rated for 70W RMS at 4ohms with an amp that would be pumping it 125W RMS on it's channel. Sure enough, looking at the documentation for the 6w0, there is a RANGE of power, from Minimum to Optimum to Danger Zone to OUT OF WARRANTY. I'm sure most other brands are the same.

The second sub-rule is that most subs actually operate at 75-85% of their RMS power rating. So, a sub rated at 100W RMS actually will likely operate at peak efficiency at 75 or 80W RMS.

Hope all that helps. Best of luck on your installs. Sorry I couldn't get into specifics for your setup, I just couldn't find a doc for the components to help guide you better.  

GlassWolf

Gold Member

Username: Glasswolf

NorthWest, Michigan USA

Post Number: 5944
Registered: Dec-03

Posted on   

a 100 watt amp with 400 watt subs will work fine.
the only drawback is that they may not be as loud as you want.
in this case my only warning is that you shouold never turn up the amp gain to compensate for lack of power.
If the amp isn't enough to make the subs as loud as you want, get a bigger amp.
setting teh gain too high only causes clipping, distortion, and driver damage which can result in amplifier failure as well.
 

GlassWolf

Gold Member

Username: Glasswolf

NorthWest, Michigan USA

Post Number: 5945
Registered: Dec-03

Posted on   

"The simple rule of thumb for matching subs to amps: Pick your amp so that it is as close to the Sub's RMS power rating without exceeding it."
bad rule.
it'll work, but remember the "power handling" of a speaker is only a thermal rating to tell you the amount of heat the coils can handle without incurring damage.
It has nothing to do with the amount of power required to reach peak output for the speaker, which is usually considerably less than the rated power handling.
An example is the Adire Brahma, rated to accept 1600wRMS, but only needing ~500wRMS to reach peak output in a proper enclosure.
Any more power won't really gain you anything with the possible exception of a steeper power increase curve, meaning more bass at lower system volumes without need to turn up bass levels on an EQ or head unit.
 

Ray G

Bronze Member

Username: Ohiopilot

Post Number: 33
Registered: Nov-04

Posted on   

As the saying goes, we agree to disagree. I approach advise on these boards from a position of understanding my audience rather than lauding my own credentials or experience with ultra-specialized exceptions.

In terms of advising newcomers, this rule works well for 98% of any application they will encounter on consumer-grade equipment, and I stand by it. Not too many folks hooking up exotic gear like Adire Brahma will be asking basic RMS power rating questions and how to match a sub to an amp. I also indicated that there is a range, so again, the rebuttal posted is somewhat brow-beating as opposed to useful. As Einstein would say, IT'S ALL RELATIVE.

I also believe there was something in there about consulting with their equipment's manufacturer...  

GlassWolf

Gold Member

Username: Glasswolf

NorthWest, Michigan USA

Post Number: 5949
Registered: Dec-03

Posted on   

If you read past thraeds throughout this forum, you'll prove yourself incorrect on several of your points above.
What I pointed out isn't ultra-specialized. It's almost universally true. No opinions. Simple objective data.
My experience and credentials weren't in question, but they speak for themselves to the accuracy of my data. For a 19 year old though, you have a good start to an understanding for audio basics.
Never stop learning.
 

Ray G

Bronze Member

Username: Ohiopilot

Post Number: 35
Registered: Nov-04

Posted on   

Poor Glass, when he gets nailed, he has to resort to character assassination (and is grossly wrong even there). How sad is must be to be both condescending AND insecure enough to lash out like that. Now we understand why you spend so much time here to rack up that kind of post count...
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Rms amp 400w

JL Audio RD400/4 Full Range Class D 4 Channel Car Speaker Amp Amplifier 400w RMS

Product Information

RD400/4

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  • twin cooling fans and real-time thermal sensing
  • hidden top-mount control panel
  • CLEAN set-up technology with LED input/output indicators
  • speaker-level inputs (speaker wire to RCA adapter required)
  • variable low-pass filter (50-250 Hz at 12 dB/octave)
  • bass boost: 0-18 dB at 45 Hz
  • frequency response: 20-220 Hz
  • fuse rating: 60A x 1 (fuse not included)
  • dimensions: 8-5/16"W x 1-9/16"H x 4-1/4"D
  • requires 8-gauge power and ground cable
  • warranty: 2 years

ROCKFORD FOSGATE Compact marine/powersports mono subwoofer amplifier — 500 watts RMS x 1 at 1 ohm

NEW item!

MSRP
$449.99

each

SALE PRICE
$379.99

2 Year Warranty with Authorized Dealer Installation!

Rockford-Fosgate  M5

 ROCKFORD FOSGATE M5 Series marine subwoofer amplifier — 750 watts RMS x 1 at 1 or 2 ohms

  • mono marine subwoofer amplifier
    • 500 watts RMS CTA-2006 x 1 at 4 ohms
    • 750 watts RMS CTA-2006 x 1 at 1 or 2 ohms
    • 1000 watts Dynamic Power at 1 ohm
  • Class-BD amplifier design
  • frequency response: 30-245 Hz
  • variable low-pass filter (50-250 Hz, 12 dB/octave)
  • switchable subsonic filter (30 Hz, 12 dB/octave)
  • variable bass boost (0-18 dB at 45 Hz)
  • Element Ready™ chassis and conformal-coated PC boards
  • IPX6 water intrusion rating
  • heavy-duty molded connectors protect wiring from water and dirt
  • Preset button for instant tuning in Rockford Fosgate UTV audio packages
  • C.L.E.A.N. gain setup system includes clip lights
  • balanced differential inputs eliminate noise picked up by your cables
  • auto remote turn-on
  • preamp and speaker-level inputs
  • preamp outputs
  • dimensions: 8-7/16"W x 1-3/4"H x 4-1/4"D
  • warranty: 2 years with Authorized Dealer Installation

ROCKFORD FOSGATE M5 Series marine subwoofer amplifier — 750 watts RMS x 1 at 1 or 2 ohms

New Item 2021

MSRP
$759.99

each

PRICE REDUCED
$629.99

2 Year Warranty with Authorized Dealer Installation!

Kenwood Kenwood Excelon

 KENWOOD eXcelon 2000W Max (1000W RMS) XR Series 2-ohm Stable Class-D Monoblock Amplifier w/ Bass Knob Included

  • Class-D 2-ohm Stable Monoblock Amplifier
  • RMS Power Rating:
    • 4 ohms: 500 watts x 1 chan.
    • 2 ohms: 1000 watts x 1 chan.
  • Total power output: 2000 watts
  • CEA-2006 Compliant Amplifier
  • Wired remote bass level control included
  • Soft start turn-on
  • Mono channel operation
  • Preamp RCA outputs to daisy chain multiple amps
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Dual speaker terminals simplify the hookup of multiple speakers
  • Heavy duty aluminum alloy heat-sink
  • Input sensitivity:
    • High level: 4V - 12V
    • Low level:.2V - 5V
  • Frequency Response: 20 - 200 Hz
  • Total Harmonic Distortion (THD): <1%
  • Signal to Noise Ratio: 100 dB
  • Variable low-pass filter: 50 - 200 Hz, 24 dB/octave
  • Subsonic filter: 15Hz - 40Hz
  • Fuse Rating: 40A x 3
  • Dimensions: 12-5/8"W x 6-5/8"L x 2"H

KENWOOD eXcelon 2000W Max (1000W RMS) XR Series 2-ohm Stable Class-D Monoblock Amplifier w/ Bass Knob Included

Price Reduction

MSRP
$650.00

each

PRICE REDUCED
$579.99

2 Year Warranty with Authorized Dealer Installation!

Rockford-Fosgate  POWER

 ROCKFORD FOSGATE 1000 WATT CLASS-BD CONSTANT POWER MONO AMPLIFIER

  • Audiophile Grade Speaker Connections
  • Infrasonic Filter
  • RCA Pass-Thru
  • MOSFET Power Supply
  • MOSFET Output Stage
  • 24db/Octave Crossover
  • 4 Gauge Power/Ground Terminals
  • Frequency Response: 20Hz - 250Hz
  • Maximum Power: 1000 Watts

ROCKFORD FOSGATE 1000 WATT CLASS-BD CONSTANT POWER MONO AMPLIFIER

New Item!

MSRP
$1049.99

each

PRICE REDUCED
$879.99

2 Year Warranty with Authorized Dealer Installation!

Rockford-Fosgate  POWER

 ROCKFORD FOSGATE 1500 WATT CLASS-BD CONSTANT POWER MONO AMPLIFIER

  • 24dB/octave crossover
  • 4 Gauge power/ground terminals
  • Audiophile grade speaker connections
  • Infrasonic filter
  • MOSFET output stage
  • MOSFET power supply
  • RCA pass-thru
  • Frequency Response: 20Hz to 250kHz +/- 0.5dB
  • Maximum Power: 1500 Watts

ROCKFORD FOSGATE 1500 WATT CLASS-BD CONSTANT POWER MONO AMPLIFIER

NEW item!

MSRP
$1199.99

each

Reg. SW Price
$1009.99

2 Year Warranty with Authorized Dealer Installation!

Rockford-Fosgate  POWER

 ROCKFORD FOSGATE 2500 Watt Class-bd Constant Power Amplifier

  • 0°/180° Phase Switch
  • 1/0 AWG power/ground connectors
  • 24dB/octave crossover
  • Audiophile grade speaker connections
  • Blue L.E.D. Stealth Signal/Power Meters - monitors signal & voltage with simulated VU needle
  • Infrasonic filter
  • MasterSync - allows 1 amplifier to control an array of amplifiers
    MOSFET output stage
  • MOSFET power supply
  • PowerSync - allows 2 amplifiers to be "strapped" together
  • RCA pass-thru

ROCKFORD FOSGATE 2500 Watt Class-bd Constant Power Amplifier

New Item!

MSRP
$2349.99

each

PRICE REDUCED
$1979.99

2 Year Warranty with Authorized Dealer Installation!

AudisonLogo THESIS SERIES

 AUDISON state-of-the-art analog and digital technology single channel (mono) amplifier used to achieve maximum performance under any load; capable of delivering up to 2300 W into 1 Ohm and 200 W in the audiophile A Class mode

  • single channel (mono) amplifier used to achieve maximum performance under any load; capable of delivering up to 2300 W into 1 Ohm and 200 W in the audiophile A Class mode. Specifically designed to drive systems and subwoofers with self-assured mastery.
  • Dual Power - Hi-Current
    • 4 Ohm - 850 W x 1
    • 2 Ohm - 1500 W x 1
    • 1 Ohm - 2300 W x 1
  • Dual Power - A Class
  • Amp Chain
    • 2 Ohm (2 Amp) - 4500 W x 1
  • Dimensions: 10”1/4 x 20”1/8 x 2”11/16
     

AUDISON state-of-the-art analog and digital technology single channel (mono) amplifier used to achieve maximum performance under any load; capable of delivering up to 2300 W into 1 Ohm and 200 W in the audiophile A Class mode

Special Order Item

MSRP
$4620.00

each

PRICE REDUCED
$4199.99

AudisonLogo BIT ACCESSORIES

 AUDISON Digital Remote Control

  • The DRC is the digital interface between the bit processors and the user. The DRC mounted in the vehicle dashboard, provides access to control of the inputs and volume adjustments, balance, fader and subwoofer volume. Providing source selection between main, aux and optical inputs, it also provides four of the configurations created and saved by the bit one (two for bit ten and bit tenD) right at hand. The DRC also controls the functions of the Audison Thesis amplifiers when these are installed in the same system. The DRC is also compatible with Prima AP Bit Amplifiers.

AUDISON Digital Remote Control

New Item!

MSRP
$245.00

each

PRICE REDUCED
$199.99

See Stores for Special Pricing

Sours: https://soundwarehouse.com/amplifiers.htm

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