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 Lot of 7 1969 PICK+ Marshall Carvin Peavey Vox Sunn Head Amp Amplifier Tube Ad $0.99 (1 Bid) End Date: Thursday May-24-2012 19:55:17 PDT |
 Lot of 7 OLD PICK + Marshall Carvin Peavey Vox Sunn Head Amp Amplifier Tube Ad $1.04 (2 Bids) End Date: Tuesday May-22-2012 18:20:50 PDT |
 Lot of 7 1965 PICK+ Marshall Carvin Peavey Vox Sunn Head Amp Amplifier Tube Ad $1.55 (2 Bids) End Date: Friday May-25-2012 19:05:41 PDT |
 Agilent Avago Bipolar MSA 0686 BLK MMIC RF Amplifier Amp MSA 0686 MAR 6sm 1GHz $0.99 End Date: Saturday May-26-2012 19:24:49 PDT |
 MINT Atlas Sound AA35 35 Watt 3 Input Channel Power Mixer Amplifier Amp $2.25 (4 Bids) End Date: Thursday May-24-2012 12:53:05 PDT |
 NEW 3 FOOT FT CLEAR MALE RCA CAR RADIO AMPLIFIER AMP STEREO AUDIO CABLE WIRES $2.29 End Date: Monday May-21-2012 15:44:03 PDT Buy It Now for only: $2.29 Buy It Now | Add to watch list |
 AC Power Cord ORANGE MACKIE AMP cable GUITAR AMPLIFIER $1.98 End Date: Sunday Jun-17-2012 17:07:56 PDT Buy It Now for only: $1.98 Buy It Now | Add to watch list |
 POWER CORD Peavey Vox Ampeg AMP Amplifier Guitar Cable $1.98 End Date: Sunday Jun-17-2012 17:08:19 PDT Buy It Now for only: $1.98 Buy It Now | Add to watch list |
 Sound Quest Self Tapping Ground Screws Amplifier Installation Amp Install Kit $2.99 End Date: Sunday Jun-3-2012 11:52:44 PDT Buy It Now for only: $2.99 Buy It Now | Add to watch list |
 20 TLV2341 OPERATIONAL AMPLIFIER OP AMP SOIC8 SMD SMT $0.99 End Date: Saturday Jun-2-2012 21:19:51 PDT Buy It Now for only: $0.99 Buy It Now | Add to watch list |
 3 wire terminal strips blocks vintage Ham Radio Amp Amplifier Connectors USA NOS $0.99 End Date: Monday Jun-11-2012 18:56:51 PDT Buy It Now for only: $0.99 Buy It Now | Add to watch list |
 10ft 3m Electric Patch Cord Guitar Amplifier AMP Cable $3.81 End Date: Saturday Jun-9-2012 5:10:56 PDT Buy It Now for only: $3.81 Buy It Now | Add to watch list |
 Guitar Electric Patch Cable AMP Amplifier Lead Cord 3M $3.81 End Date: Sunday Jun-10-2012 10:50:39 PDT Buy It Now for only: $3.81 Buy It Now | Add to watch list |
 10ft 3m Electric Patch Cord Guitar Amplifier AMP Cable $3.84 End Date: Sunday May-20-2012 7:26:16 PDT Buy It Now for only: $3.84 Buy It Now | Add to watch list |
 Guitar Electric Patch Cable AMP Amplifier Lead Cord 3M $3.84 End Date: Monday May-21-2012 4:24:59 PDT Buy It Now for only: $3.84 Buy It Now | Add to watch list |
 UC3176 Full Bridge Power Amplifier 2A 35V Dual Amp $0.99 End Date: Monday May-21-2012 15:36:24 PDT |
 4 SX KX KICKER AMP AMPLIFIER END CAP COVER SCREWS NEW $1.95 End Date: Saturday Jun-16-2012 21:05:02 PDT Buy It Now for only: $1.95 Buy It Now | Add to watch list |
 VEHICLE DEVICE 5 WIRE HARNESS RELAY SOCKET FOR 12V 40 AMP RELAY 5 PINS TERMINAL $3.99 End Date: Thursday May-24-2012 17:04:28 PDT Buy It Now for only: $3.99 Buy It Now | Add to watch list |
 CAR ELECTRONICS 5 WIRE SOCKET HARNESS RELAY FOR 40 AMP 12V RELAY 5 PINS PLUG $3.99 End Date: Thursday May-24-2012 17:10:15 PDT Buy It Now for only: $3.99 Buy It Now | Add to watch list |
 1956 Photofact Set 341 Folder 8 Magnavox Amplifier Model AMP 149 $3.99 End Date: Friday May-25-2012 9:03:47 PDT |
 XPRESS VS90 GLASS AGU FUSE HOLDER GOLD PLATED BLOCK FOR VEHICLE STEREO AMPLIFIER $3.99 End Date: Wednesday May-30-2012 11:38:34 PDT Buy It Now for only: $3.99 Buy It Now | Add to watch list |
 Raptor FD 5012 fd5012 Ford Amplifier Integrator Plug into Amp Harness $3.99 End Date: Friday Jun-8-2012 13:51:23 PDT Buy It Now for only: $3.99 Buy It Now | Add to watch list |
 Lot of 7 OLD PICK + Marshall Carvin Peavey Vox Sunn Head Amp Amplifier Tube Ad $4.25 (6 Bids) End Date: Thursday May-24-2012 19:50:21 PDT |
 AC Power Cord ORANGE MACKIE AMP cable GUITAR AMPLIFIER $4.29 End Date: Thursday May-31-2012 19:13:23 PDT Buy It Now for only: $4.29 Buy It Now | Add to watch list |
 POWER CORD Peavey Vox Ampeg AMP Amplifier Guitar Cable $4.29 End Date: Thursday May-31-2012 19:13:37 PDT Buy It Now for only: $4.29 Buy It Now | Add to watch list |
 NEW NTE250 PNP Si Darlington Power Amp Amplifier Transistor NTE 250 $2.39 End Date: Thursday May-24-2012 8:35:11 PDT Buy It Now for only: $2.39 Buy It Now | Add to watch list |
 Fender Skirt Amplifier Amp FM DSP Pointer D Shaft Knob PN 0073754049 $2.95 End Date: Saturday May-26-2012 12:07:03 PDT Buy It Now for only: $2.95 Buy It Now | Add to watch list |
 Set of 6 Fender Amplifier Amp FM DSP Push Knob Bushing Spacers $2.95 End Date: Friday Jun-15-2012 21:56:59 PDT Buy It Now for only: $2.95 Buy It Now | Add to watch list |
 Fender Acoustasonic Series Brown Vintage style skirted amplifier knob amp $3.50 End Date: Thursday May-24-2012 15:01:51 PDT Buy It Now for only: $3.50 Buy It Now | Add to watch list |
 Power Cable Peavey Vox Ampeg AMP Amplifier Guitar Cord $1.55 End Date: Sunday May-27-2012 0:44:12 PDT Buy It Now for only: $1.55 Buy It Now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.55 End Date: Monday May-21-2012 15:02:20 PDT Buy It Now for only: $4.55 Buy It Now | Add to watch list |
 10ft 3m Electric Patch Cord Guitar Amplifier AMP Cable $4.55 End Date: Friday May-25-2012 18:33:45 PDT Buy It Now for only: $4.55 Buy It Now | Add to watch list |
 4pin pole Speakon PA speaker wire amp amplifier Cable cord plug Connector jack $4.59 End Date: Friday May-25-2012 14:16:53 PDT Buy It Now for only: $4.59 Buy It Now | Add to watch list |
 8 STEREO AUDIO AMPLIFIER 12V 4W2 01 THD AMP DIP14 $1.99 End Date: Saturday Jun-2-2012 21:01:36 PDT Buy It Now for only: $1.99 Buy It Now | Add to watch list |
 METRA 70 8112 TOYOTA RADIO WITH AMPLIFIER AMP INTERGRATION T15 PIN WIRE HARNESS $4.75 End Date: Saturday Jun-16-2012 20:50:36 PDT Buy It Now for only: $4.75 Buy It Now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 6:54:22 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 8:55:44 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 10:01:13 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 10:39:48 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 10:51:15 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 13:12:00 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 13:51:36 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 15:53:46 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 16:42:25 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 18:18:33 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Sunday May-20-2012 20:27:28 PDT Buy It Now for only: $5.29 Buy It Now | Bid now | Add to watch list |
 10ft 3m Electric Patch Guitar Amplifier AMP Cable Cord $4.79 End Date: Monday Jun-18-2012 18:47:12 PDT Buy It Now for only: $4.79 Buy It Now | Add to watch list |
 10ft 3m Electric Patch Cord Guitar Amplifier AMP Cable $4.79 End Date: Monday Jun-18-2012 19:12:57 PDT Buy It Now for only: $4.79 Buy It Now | Add to watch list |
 TDA7052A Philips 1W Single IC BTL Mono Audio Amplifier DIP 8 8Ohm Amp TDA7052 $2.95 End Date: Tuesday Jun-5-2012 22:21:39 PDT Buy It Now for only: $2.95 Buy It Now | Add to watch list |
 6 FOOT IEC POWER CABLE RATED 10AMP 250VOLT COMPUTER MONITOR AMPLIFIER ETC $1.99 End Date: Saturday May-26-2012 21:24:29 PDT Buy It Now for only: $1.99 Buy It Now | Add to watch list |
 STINGER SGBRCAM CAR AUDIO AMP AMPLIFIER RCA BARREL MALE TO MALE CONNECTOR PAIR $4.95 End Date: Sunday May-20-2012 10:59:47 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 METRA 70 5512 CAR WIRE WIRING HARNESS FORD PREMIUM AMP AMPLIFIER INTEGRATOR PLUG $4.95 End Date: Wednesday May-23-2012 11:37:02 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 SET OF 2 CAR STEREO GOLD PLATED 120 AMP POWER INLINE GLASS AMPLIFIER FUSES $4.95 End Date: Friday Jun-1-2012 7:10:32 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 SET OF 2 CAR STEREO GOLD PLATED 100 AMP POWER INLINE GLASS AMPLIFIER FUSES $4.95 End Date: Friday Jun-1-2012 7:11:17 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 SET OF 2 CAR STEREO GOLD PLATED 80 AMP POWER INLINE GLASS AMPLIFIER FUSES $4.95 End Date: Friday Jun-1-2012 7:11:42 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 SET OF 2 CAR STEREO GOLD PLATED 70 AMP POWER INLINE GLASS AMPLIFIER FUSES $4.95 End Date: Friday Jun-1-2012 7:12:20 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 SET OF 2 CAR STEREO GOLD PLATED 60 AMP POWER INLINE GLASS AMPLIFIER FUSES $4.95 End Date: Friday Jun-1-2012 7:12:40 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 SET OF 2 CAR STEREO GOLD PLATED 50 AMP POWER INLINE GLASS AMPLIFIER FUSES $4.95 End Date: Friday Jun-1-2012 7:13:03 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 SET OF 2 CAR STEREO GOLD PLATED 40 AMP POWER INLINE GLASS AMPLIFIER FUSES $4.95 End Date: Friday Jun-1-2012 7:13:24 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 SET OF 2 CAR STEREO GOLD PLATED 30 AMP POWER INLINE GLASS AMPLIFIER FUSES $4.95 End Date: Friday Jun-1-2012 7:13:45 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 SET OF 2 CAR STEREO GOLD PLATED 20 AMP POWER INLINE GLASS AMPLIFIER FUSES $4.95 End Date: Friday Jun-1-2012 7:14:17 PDT Buy It Now for only: $4.95 Buy It Now | Add to watch list |
 AC Power Cord ORANGE MACKIE AMP cable GUITAR AMPLIFIER $4.99 End Date: Monday May-21-2012 11:30:29 PDT Buy It Now for only: $7.95 Buy It Now | Bid now | Add to watch list |
 POWER CORD Peavey Vox Ampeg AMP Amplifier Guitar Cable $4.99 End Date: Monday May-21-2012 11:31:44 PDT Buy It Now for only: $7.95 Buy It Now | Bid now | Add to watch list |
 AC Power Cord ORANGE MACKIE AMP cable GUITAR AMPLIFIER $4.99 End Date: Monday May-21-2012 11:33:15 PDT Buy It Now for only: $7.95 Buy It Now | Bid now | Add to watch list |
 POWER CORD Peavey Vox Ampeg AMP Amplifier Guitar Cable $4.99 End Date: Monday May-21-2012 11:34:23 PDT Buy It Now for only: $7.95 Buy It Now | Bid now | Add to watch list |
 Xscorpion RT0 2G Platinum Plated 0 2 Gauge Ring Terminal for Car Amplifier Amp $4.99 End Date: Tuesday May-22-2012 19:47:18 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 AC Power Cord ORANGE MACKIE AMP cable GUITAR AMPLIFIER $4.99 End Date: Wednesday May-23-2012 11:29:30 PDT Buy It Now for only: $7.97 Buy It Now | Bid now | Add to watch list |
 POWER CORD Peavey Vox Ampeg AMP Amplifier Guitar Cable $4.99 End Date: Wednesday May-23-2012 11:29:52 PDT Buy It Now for only: $7.97 Buy It Now | Bid now | Add to watch list |
 AC Power Cord ORANGE MACKIE AMP cable GUITAR AMPLIFIER $4.99 End Date: Wednesday May-23-2012 11:33:38 PDT Buy It Now for only: $7.97 Buy It Now | Bid now | Add to watch list |
 POWER CORD Peavey Vox Ampeg AMP Amplifier Guitar Cable $4.99 End Date: Wednesday May-23-2012 11:34:41 PDT Buy It Now for only: $7.97 Buy It Now | Bid now | Add to watch list |
 Power Cable for Peavey Vox Ampeg AMP Amplifier Guitar Cord $4.99 End Date: Wednesday May-30-2012 0:02:42 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 Blaupunkt 7 607 622 048 001 Plug n Play THA PnP Series Amplifier Amp Harness $4.99 End Date: Friday Jun-1-2012 10:53:38 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 METRA 70 8112 TOYOTA RADIO WITH AMPLIFIER AMP INTERGRATION T15 PIN WIRE HARNESS $4.99 End Date: Tuesday Jun-5-2012 11:36:40 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 AC Power Cord ORANGE MACKIE AMP cable GUITAR AMPLIFIER $4.99 End Date: Thursday Jun-7-2012 11:27:33 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 POWER CORD Peavey Vox Ampeg AMP Amplifier Guitar Cable $4.99 End Date: Thursday Jun-7-2012 11:28:18 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 Guitar Electric Patch Cable AMP Amplifier Lead Cord 3M $4.99 End Date: Thursday Jun-7-2012 22:24:54 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 AUDIOBAHN 4 PCS 4 AMP AGU AMPLIFIER FUSES BLUE LED $4.99 End Date: Wednesday Jun-13-2012 19:15:43 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 Scosche FD13B Select 1995 up Ford High Level Amplifier Amp Input Connector $4.99 End Date: Sunday Jun-17-2012 15:55:12 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 AUDIOBAHN 4 PCS 4 AMP AGU AMPLIFIER FUSES BLUE LED $4.99 End Date: Sunday Jun-17-2012 17:27:34 PDT Buy It Now for only: $4.99 Buy It Now | Add to watch list |
 DEAN MARKLEY GUITAR AND AMPLIFIER COMPANY AMP LANYARD $2.00 End Date: Friday May-25-2012 16:50:08 PDT |
 Cb Ham Radio Car Amp Amplifier Audio Gold ANL100 Fuse $5.00 End Date: Thursday Jun-7-2012 8:39:04 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 Cb Ham Radio Car Amp Amplifier Audio Gold ANL150 Fuse $5.00 End Date: Thursday Jun-7-2012 8:47:14 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 Cb Ham Radio Car Amp Amplifier Audio Gold ANL 200 Fuse $5.00 End Date: Thursday Jun-7-2012 14:07:22 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 Cb Ham Radio Car Amp Amplifier Audio Gold ANL 250 Fuse $5.00 End Date: Thursday Jun-7-2012 14:07:55 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 Cb Ham Radio Car Amp Amplifier Audio Gold ANL 300 Fuse $5.00 End Date: Thursday Jun-7-2012 14:08:34 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 METRA 70 8112 TOYOTA RADIO WITH AMPLIFIER AMP INTERGRATION T15 PIN WIRE HARNESS $5.00 End Date: Monday Jun-18-2012 11:38:48 PDT Buy It Now for only: $5.00 Buy It Now | Add to watch list |
 PIONEER Home Stereo Mixing AMPLIFIER SA V210 Amp Original SERVICE MANUAL $2.97 End Date: Thursday May-24-2012 12:30:34 PDT Buy It Now for only: $2.97 Buy It Now | Add to watch list |
 741 Operational Amplifier IC Chip 8 Pin DIP OP AMP $1.25 End Date: Saturday May-26-2012 23:10:10 PDT Buy It Now for only: $1.25 Buy It Now | Add to watch list |
 2 100uf 400v Snap In UCC SMM High Voltage Tube Amp Amplifier Capacitors $2.99 End Date: Monday Jun-18-2012 18:09:47 PDT Buy It Now for only: $2.99 Buy It Now | Add to watch list |
 LME49990 Ultra low noise Ultra low distortion Audio Op Amp amplifier LME49990MA $5.29 End Date: Thursday Jun-14-2012 14:39:54 PDT Buy It Now for only: $5.29 Buy It Now | Add to watch list |
 STINGER SD15 DRONE SERIES AMPLIFIER AMP RCA INTERCONNECT 15 AUDIO PATCH CABLE $5.45 End Date: Saturday Jun-9-2012 14:32:26 PDT Buy It Now for only: $5.45 Buy It Now | Add to watch list |
 STINGER SD5 DRONE SERIES AMPLIFIER AMP RCA INTERCONNECT 05 AUDIO PATCH CABLE $5.45 End Date: Saturday Jun-9-2012 15:10:57 PDT Buy It Now for only: $5.45 Buy It Now | Add to watch list |
 2 PACK new 4 pole speakon panel mount speaker cabinet amp amplifier connectors $5.49 End Date: Thursday Jun-7-2012 19:05:06 PDT Buy It Now for only: $5.49 Buy It Now | Add to watch list |
 Magnavox AMP 139AA Audio Amplifier Photofact 1956 $3.99 End Date: Tuesday Jun-12-2012 11:12:58 PDT Buy It Now for only: $3.99 Buy It Now | Add to watch list |
 PIONEER Home AMPLIFIER A X900 Amp SERVICE MANUAL $3.47 End Date: Wednesday Jun-13-2012 6:41:04 PDT Buy It Now for only: $3.47 Buy It Now | Add to watch list |
 PIONEER Home AMPLIFIER A V1200 Amp SERVICE MANUAL $3.47 End Date: Wednesday Jun-13-2012 6:47:48 PDT Buy It Now for only: $3.47 Buy It Now | Add to watch list |
 Sentinel AMP 151AA AMP 151BB Amplifier Sams Photofact Repair Manual Schematic $4.24 End Date: Thursday Jun-7-2012 12:37:19 PDT Buy It Now for only: $4.24 Buy It Now | Add to watch list |
 Sentinel Chassis AMP 138AA Amplifier Sams Photofact Repair Manual Schematic $4.24 End Date: Thursday Jun-7-2012 12:47:24 PDT Buy It Now for only: $4.24 Buy It Now | Add to watch list |
 Magnavox AMP 137AB Audio Control Amplifier Photofact $4.24 End Date: Tuesday Jun-12-2012 11:06:08 PDT Buy It Now for only: $4.24 Buy It Now | Add to watch list |
You can also check out Amazon for information on Amplifier Amp.
 Scosche EAGU60-4 60 amp AGU Fuse - 4 Pack List Price: Sale Price: $5.90 You save: $2.09 (26%)  Eligible for free shipping!Availability: Usually ships in 1-2 business days  |
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Car Audio Amplifier Overview
Your amplifier takes the signal from your head unit and makes it big enough to be able to drive your speakers. It is preferable to use separate amps for high and low frequencies but it is not necessary. The problem with using one amp for all frequencies is that you cannot adjust the levels among different frequency ranges as easily as you can adjust outputs of separate amps. Many people begin their system with an amplifier for the low frequencies (bass) and use their head units built-in power to drive the higher frequency speakers. This is enough but the built-in power in a head unit is usually not strong enough for high volume listening and not clean enough for the discerning ear. There are lots of choices when choosing an amplifier.
Things to look for:
RMS Power: The power output of an amplifier should be roughly matched to what the amp will be used for and what speakers it will be driving. Oddly enough, the most regular problem with matching speakers and amps is using an amp that is too weak to power the speaker. When an underpowered amp is used to power a speaker, the listener tends to turn the volume up higher in order to get more output of the amplifier. This usually leads to the amplifier running to its limit and distorting. This distortion can cause the output from the amplifier to become DC for short periods of time and DC signals of even low power can damage a speaker. Under powering a speaker in this way can be more dangerous than overpowering it! Also greater power is usually needed when powering subwoofers because of their greater size and excursion. Do not plan on using an amp of less than 75watts per channel to drive a subwoofer. The converse holds true for higher frequencies (midrange and treble) only 25-50watts per channel are needed to drive speakers in those frequency ranges, however more power will not hurt, it just probably will not be used. Another factor in power output is stability in low resistance loads. It is possible to wire mutiple subwoofers to a single channel on an amplifier but the amp will have to work harder to drive this kind of load. Many affordable priced amps can drive loads as low as 2 ohms or less, with 4 ohms being the typical load of a single speaker.
Power Supply Regulation: The power supply in an amplifier converts the 12volt DC that is available in your car's electrical system to something the amp can use to produce greater power. Several designs are used by manufacturers today. Two categories are regulated and unregulated. A regulated supply produces the same power regardless of whether your car's electrical system voltage sags (which a capacitor will help prevent). An unregulated supply's power output depends directly on the input voltage. This causes changes in the maximum output power with changes in the car's electrical system. I recommend getting an amp with a regulated power supply so power output will be constant regardless of input voltage changes. This changes if you have a stiffening capacitor or another regulation device (Accumatch) to smooth out your car's electrical system. In this case, buy an amp with an unregulated supply. Some cheap amps use unregulated supplies to save money but provide none of the benefits of a regular unregulated supply. One way to determine whether an amp has a regulated supply or not is to view the power output specs for 12volt and 14.4volt inputs. If they are the same then the amp probably has a regulated supply otherwise it has an unregulated one.
Tri-Mode: A few amps can play in what is called "tri-mode." In this mode, 2 channels are used to drive a pair of high frequency speakers and one subwoofer. The subwoofer receives power from both channels. This is a very efficient way to use an amp for more than one purpose. A special crossover is required to separate the two ranges of frequencies and it should have a way of adjusting the output level between the high frequency speakers and the subwoofer. This is a good way to save some money.
Other Specs: THD (Total Harmonic Distortion) is a specification that often shows up with the power output spec. An example would be "45wattsx2 @ 0.01% THD" This spec says that at an output level of 45watts into each channel the THD will be no more than 0.01%. At times manufacturers will quote the power spec at a THD of 1%. Be wary of this, 1% THD is low quality and either implies that the amp is not very good or that the manufacturer is artificially increasing the power output spec by running the amp into a higher distortion region where it does produce more power but more distortion as well. Either way it is a sign of a low amp or marketing that deceives. Anything lower than 0.1% is negligible.
Built-in Crossovers: These allow you to use the amp to only amplify certain frequencies and dedicate the amp to a subwoofer or some other specialized speaker. By using an amplifier's built-in crossover you eliminate the need for a separate one which can save you quite a bit of money.
Pre-amp Outputs: Some amps have pre-amp outputs which allow you to "daisy-chain" multiple amps together without splitting the pre-amp output from your head unit. Also, if the amp has a built-in crossover, you can use it to drive another amp.
Car Audio Amplifiers are available wholesale at http://www.apex-audio.com
About the Author
Professor Apex is an Expert In Car Audio and Mobile Video. He has more than 13 years of experience. You can find him here: Wholesale Car Audio
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