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1977 Mazda GLC

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Use our shopping filters to find the right 2/3/4-channel amp to power upgraded speakers properly.

Overview Upgrade your Speakers Add a Subwoofer Add an Amplifier Digital Sound Processors Audio Installation & Accessories Add a Backup Camera Dads & Grads Sale

Amps for Adding Speakers for 1977 Mazda GLC

Some vehicles require an amp bypass module, a line-output converter like the NVX XLCA2 or AudioControl LC2i, or a DSP to integrate with your factory radio and avoid bass roll-off. Bass roll-off occurs when a factory radio's crossover is designed only for the original equipment speakers, resulting in a not complete signal being sent to your new aftermarket amp.

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Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.
Total Peak Power Output
The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
Remote bass/level controller
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
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Hertz HCP5D with NVX 8 Gauge Amp Kit

Class D 5-Channel Car Subwoofer Amplifier

HCP5D_XKIT86 big
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Hertz HCP5D with NVX 8 Gauge Amp Kit

Class D 5-Channel Car Subwoofer Amplifier

• 150 Watts RMS x 4 + 200 Watts x 1 @ 4 ohm
• 250 Watts RMS x 4 + 300 Watts x 1 @ 2 ohm
• CEA-2006 Compliant
• Refined Heatsink with High Convection Capability
• Automatic Remote Turn-On/Off function
• Dimensions: 13.58" x 7.48" x 1.97"
• Includes Amplifier Wiring Kit

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• 150 Watts RMS x 4 + 200 Watts x 1 @ 4 ohm
• 250 Watts RMS x 4 + 300 Watts x 1 @ 2 ohm
• CEA-2006 Compliant
• Refined Heatsink with High Convection Capability
• Automatic Remote Turn-On/Off function
• Dimensions: 13.58" x 7.48" x 1.97"
• Includes Amplifier Wiring Kit

AudioControl ACM-2.300 + NVX Premium 8 Gauge Amp Wiring Kit

300W RMS ACM Series 2 ohm Stable 2-Channel Class-D Amplifier

ACM-2.300, XKIT82 big
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AudioControl ACM-2.300 + NVX Premium 8 Gauge Amp Wiring Kit

300W RMS ACM Series 2 ohm Stable 2-Channel Class-D Amplifier

• 75 Watts RMS x 2 @ 4 ohm
• 150 Watts RMS x 2 @ 2 ohm
• 300 Watts RMS x 1 @ 4 ohm
• Small Footprint for Flexible Mounting
• AccuBASS and GTO Signal Sense Built In
• Linkwitz-Riley Crossover
• Aluminum Heatsink
• Dimensions: 9.4" W x 3" L x 1.75" H

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60
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• 75 Watts RMS x 2 @ 4 ohm
• 150 Watts RMS x 2 @ 2 ohm
• 300 Watts RMS x 1 @ 4 ohm
• Small Footprint for Flexible Mounting
• AccuBASS and GTO Signal Sense Built In
• Linkwitz-Riley Crossover
• Aluminum Heatsink
• Dimensions: 9.4" W x 3" L x 1.75" H

Kenwood eXcelon XM802-5 with Amplifier Wiring Kit

1600W Peak (800W RMS) Class D 5-Channel Car Audio Amplifier

XM8025, BAK46 big
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Kenwood eXcelon XM802-5 with Amplifier Wiring Kit

1600W Peak (800W RMS) Class D 5-Channel Car Audio Amplifier

• 75 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 75 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 800 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 75 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 75 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 800 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 5-Channel Amplifier
• Includes Amplifier Wiring Kit

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NVX VADM2 Amplifier with Amplifier Wiring Kit

440W RMS Full Range Class D 2-Channel Car/Marine/Powersports Amplifier

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NVX VADM2 Amplifier with Amplifier Wiring Kit

440W RMS Full Range Class D 2-Channel Car/Marine/Powersports Amplifier

• 440 Watt True RMS Output!
• Marine Certified 2-Channel Micro Class D Amplifier
• 150W x 2-Chan. @ 4 ohm
• 220W x 2-Chan. @ 2 ohm
• 440W x 1-Chan. @ 4 ohm
• 3-Way System Protection
• 8 Gauge Power and Ground Inputs
• Extremely Small Footprint

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• 440 Watt True RMS Output!
• Marine Certified 2-Channel Micro Class D Amplifier
• 150W x 2-Chan. @ 4 ohm
• 220W x 2-Chan. @ 2 ohm
• 440W x 1-Chan. @ 4 ohm
• 3-Way System Protection
• 8 Gauge Power and Ground Inputs
• Extremely Small Footprint

NVX VAD10004 with Amplifier Wiring Kit

1000W RMS Full Range 4-Channel Amplifier

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NVX VAD10004 with Amplifier Wiring Kit

1000W RMS Full Range 4-Channel Amplifier

• RMS: 150 x 4 @ 4 ohm, 250W x 4 @ 2 ohm, Bridged 500W x 2 @ 4 ohm
• Total RMS Power: 1000W
• CEA-2006 Compliant
• Efficient Full Range Class D Design
• Includes Amplifier Wiring Kit

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• RMS: 150 x 4 @ 4 ohm, 250W x 4 @ 2 ohm, Bridged 500W x 2 @ 4 ohm
• Total RMS Power: 1000W
• CEA-2006 Compliant
• Efficient Full Range Class D Design
• Includes Amplifier Wiring Kit

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NVX NBA201 Amplifier + NVX 4 Gauge Premium Amp Wiring Kit

700W Total RMS N-Series Class-AB 2-Channel Amplifier Package (Includes Amplifier and Amp Wiring kit)

NBA201, XKIT42 big
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NVX NBA201 Amplifier + NVX 4 Gauge Premium Amp Wiring Kit

700W Total RMS N-Series Class-AB 2-Channel Amplifier Package (Includes Amplifier and Amp Wiring kit)

• 200 watts x 2 channel @ 4 ohm
• 350 watts x 2 channel @ 2 ohm
• Bridged: 1400 watts x 1 channel @ 4 ohm
• Total RMS Power: 700 watts
• CEA-2006 Compliant

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• 200 watts x 2 channel @ 4 ohm
• 350 watts x 2 channel @ 2 ohm
• Bridged: 1400 watts x 1 channel @ 4 ohm
• Total RMS Power: 700 watts
• CEA-2006 Compliant

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Rockford Fosgate P500X2 with Amplifier Wiring Kit

500W RMS 2-Channel Amplifier (P500X.2) with NVX 8 Gauge Amplifier Wiring Kit

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Rockford Fosgate P500X2 with Amplifier Wiring Kit

500W RMS 2-Channel Amplifier (P500X.2) with NVX 8 Gauge Amplifier Wiring Kit

• 150W x 2 Chan. @ 4 ohm
• 250W x 2 Chan. @ 2 ohm
• Built In NOMAD "Real Time" Analog Computer
• 2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• MESHA3 Reduces MOSFET Temperatures for Improved Durability

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• 150W x 2 Chan. @ 4 ohm
• 250W x 2 Chan. @ 2 ohm
• Built In NOMAD "Real Time" Analog Computer
• 2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• MESHA3 Reduces MOSFET Temperatures for Improved Durability

Rockford Fosgate Power T1000-4AD with Amplifier Wiring Kit

1000W 4-Channel Class AD Power Series Constant Power Amplifier

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Rockford Fosgate Power T1000-4AD with Amplifier Wiring Kit

1000W 4-Channel Class AD Power Series Constant Power Amplifier

• 1000W RMS
• 250W x 4-Chan @ 4 Ohm
• NOMAD Real Time Computer Protection
• 50-500 Hz LP/AP/HP Crossovers
• Constant Power

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• 1000W RMS
• 250W x 4-Chan @ 4 Ohm
• NOMAD Real Time Computer Protection
• 50-500 Hz LP/AP/HP Crossovers
• Constant Power

DS18 SXE-1200.4/BK (Black) with Belva 4 Gauge Amp Kit

1200W Peak (400W RMS) Class AB SXE Series 4-channel Car Amplifier

SXE12004BK_BAK44 big
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DS18 SXE-1200.4/BK (Black) with Belva 4 Gauge Amp Kit

1200W Peak (400W RMS) Class AB SXE Series 4-channel Car Amplifier

• 60 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class A/B 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

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• 60 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class A/B 2 ohm Stable 4-Channel-Channel Amplifier (Black)
• Includes Amplifier Wiring Kit

DS18 SXE-2000.4D/RD (Red) with Belva 4 Gauge Amp Kit

2000W Peak (640W RMS) Class D SXE Series 4-Channel Car Amplifier

SXE20004DRD_BAK44 big
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DS18 SXE-2000.4D/RD (Red) with Belva 4 Gauge Amp Kit

2000W Peak (640W RMS) Class D SXE Series 4-Channel Car Amplifier

• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 3 channel @ 4 ohm
• Total RMS Power: 640 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier (Red)
• Includes Amplifier Wiring Kit

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• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 3 channel @ 4 ohm
• Total RMS Power: 640 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier (Red)
• Includes Amplifier Wiring Kit

Hifonics HCM-400.4D with Belva 4 Gauge Amp Kit

400W Peak Colossus Mini Series Class-D 4-Channel Amplifier with Bass Remote

HCM4004D_BAK44 big
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Hifonics HCM-400.4D with Belva 4 Gauge Amp Kit

400W Peak Colossus Mini Series Class-D 4-Channel Amplifier with Bass Remote

• 4 x 50 @ 4 ohm
• 4 x 100 @ 2 ohm
• Bridged: 2 x 200 @ 4 ohm
• Total Peak Power: 400W
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 4 x 50 @ 4 ohm
• 4 x 100 @ 2 ohm
• Bridged: 2 x 200 @ 4 ohm
• Total Peak Power: 400W
• Class D 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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Rockford Fosgate Punch P300X2 with Belva 4 Gauge Amp Kit

300W RMS Punch Series 2-Channel Class AB Car Power Amplifier

P300X2_BAK42 big
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Rockford Fosgate Punch P300X2 with Belva 4 Gauge Amp Kit

300W RMS Punch Series 2-Channel Class AB Car Power Amplifier

• 100 watts x 2 channel @ 4 ohm
• 150 watts x 2 channel @ 2 ohm
• Bridged: 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class A/B 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 100 watts x 2 channel @ 4 ohm
• 150 watts x 2 channel @ 2 ohm
• Bridged: 300 watts x 1 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class A/B 2 ohm Stable 2-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Alpine KTP-445A with NVX 8 Gauge Amp Kit

180W RMS Power Pack Series Class D 4-Channel Compact Amplifier

KTP445A_XKIT84 big
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Alpine KTP-445A with NVX 8 Gauge Amp Kit

180W RMS Power Pack Series Class D 4-Channel Compact Amplifier

• 45 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Total RMS Power: 180 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 45 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Total RMS Power: 180 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

DS18 G4000.5D with NVX 4 Gauge Amp Kit

4000W Peak (1480W RMS) Class D Gen-X Series 5-Channel Amplifier with Bass Remote and Input Selector

G40005D_XKIT46 big
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DS18 G4000.5D with NVX 4 Gauge Amp Kit

4000W Peak (1480W RMS) Class D Gen-X Series 5-Channel Amplifier with Bass Remote and Input Selector

• 130 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 220 watts x 4 channel + 600 watts x 1 channel @ 2 ohm
• Bridged: 420 watts x 2 channel @ 4 ohm + 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 1480 watts
• Class D 2 ohm Stable 5-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 130 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 220 watts x 4 channel + 600 watts x 1 channel @ 2 ohm
• Bridged: 420 watts x 2 channel @ 4 ohm + 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 1480 watts
• Class D 2 ohm Stable 5-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

Hertz SP 4.900 with NVX 4 Gauge Amp Kit

900W RMS SPL Show Series Class-D 4-channel Amplifier

SP4900_XKIT44 big
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Hertz SP 4.900 with NVX 4 Gauge Amp Kit

900W RMS SPL Show Series Class-D 4-channel Amplifier

• 160 watts x 4 channel @ 4 ohm
• 250 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 900 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 160 watts x 4 channel @ 4 ohm
• 250 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 900 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 4-Channel-Channel Amplifier
• Includes Amplifier Wiring Kit

JBL Club A754 with NVX 8 Gauge Amp Kit

400W RMS Club Series Class-H Compact 4-Channel Amplifier

CLUBA754_XKIT84 big
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JBL Club A754 with NVX 8 Gauge Amp Kit

400W RMS Club Series Class-H Compact 4-Channel Amplifier

• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class H 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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• 75 watts x 4 channel @ 4 ohm
• 100 watts x 4 channel @ 2 ohm
• Bridged: 200 watts x 2 channel @ 4 ohm
• Total RMS Power: 400 watts
• Class H 2 ohm Stable 4-Channel Amplifier
• Includes Amplifier Wiring Kit

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Rockford Fosgate Punch PBR300X2 + NVX XKIT82 8 Gauge Amp Wiring Kit

300 Watts Punch Series Boosted Rail Compact 2-Channel Amplifier

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Rockford Fosgate Punch PBR300X2 + NVX XKIT82 8 Gauge Amp Wiring Kit

300 Watts Punch Series Boosted Rail Compact 2-Channel Amplifier

• RMS 100W x 2 @ 4 ohm, 150W x 2 @ 2 ohm, 300W x 1 @ 4 ohm Bridged
• Features Rockford Fosgate's Class-BR Topology
• CEA-2006 Compliant
• Ultra Compact Chassis
• Boosted Rail Design
• Dimensions: 6.75"L x 4.25"W x 1.53"H
• Includes NVX XKIT82 8 Gauge Amp Wiring Kit

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• RMS 100W x 2 @ 4 ohm, 150W x 2 @ 2 ohm, 300W x 1 @ 4 ohm Bridged
• Features Rockford Fosgate's Class-BR Topology
• CEA-2006 Compliant
• Ultra Compact Chassis
• Boosted Rail Design
• Dimensions: 6.75"L x 4.25"W x 1.53"H
• Includes NVX XKIT82 8 Gauge Amp Wiring Kit

Alpine S2-A55V with Amplifier Wiring Kit

540W RMS S-Series Class-D 5-Channel Amplifier + NVX 4 Gauge 6-Channel Wiring Kit

S2-A55V_XKIT46 big
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Alpine S2-A55V with Amplifier Wiring Kit

540W RMS S-Series Class-D 5-Channel Amplifier + NVX 4 Gauge 6-Channel Wiring Kit

• 40 watts x 4 channel + 200 watts x 1 channel @ 4 ohm
• 60 watts x 4 channel + 300 watts x 1 channel @ 2 ohm
• Bridged: 120 watts x 2 channel @ 4 ohm + 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 540 watts
• Class D 2 ohm Stable 5-Channel-Channel Amplifier

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• 40 watts x 4 channel + 200 watts x 1 channel @ 4 ohm
• 60 watts x 4 channel + 300 watts x 1 channel @ 2 ohm
• Bridged: 120 watts x 2 channel @ 4 ohm + 300 watts x 1 channel @ 2 ohm
• Total RMS Power: 540 watts
• Class D 2 ohm Stable 5-Channel-Channel Amplifier

JBL Club A5055 (AMPCBA5055AM) + NVX XKIT46

Class AB + D High Performance 5-Channel Amplifier + NVX XKIT46 4 Gauge 6-Channel Amp Wirring Kit

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JBL Club A5055 (AMPCBA5055AM) + NVX XKIT46

Class AB + D High Performance 5-Channel Amplifier + NVX XKIT46 4 Gauge 6-Channel Amp Wirring Kit

• Class AB + D Amp Technology
• 4 Ohm: 50 Watts RMS x 4 + 320 Watts RMS x 1
• Variable Crossover and Bass Boost
• Variable High and Low-Pass Filters
• Full on Board Protection

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• Class AB + D Amp Technology
• 4 Ohm: 50 Watts RMS x 4 + 320 Watts RMS x 1
• Variable Crossover and Bass Boost
• Variable High and Low-Pass Filters
• Full on Board Protection

Alpine R2-A60F with Amplifier Wiring Kit

600W RMS R-Series Class-D 4-Channel Car Amplifier + NVX 4 Gauge 4-Channel Amp Wiring Kit

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Alpine R2-A60F with Amplifier Wiring Kit

600W RMS R-Series Class-D 4-Channel Car Amplifier + NVX 4 Gauge 4-Channel Amp Wiring Kit

• 100 watts x 4 channel @ 4 ohm
• 150 watts x 4 channel @ 2 ohm
• Bridged: 300 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier

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List price $805.99
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• 100 watts x 4 channel @ 4 ohm
• 150 watts x 4 channel @ 2 ohm
• Bridged: 300 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel-Channel Amplifier

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    FAQ for Multi-channel Amplifiers for Adding Speakers in 1977 GLC

    Q: Can I upgrade or change the Multi-channel Amplifiers for Adding Speakers in 1977 Mazda GLC?

    A: Yes this page includes all the best Multi-channel Amplifiers for Adding Speakers that work in your GLC.

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