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1978 Dodge Diplomat

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

Speakers & Speaker Installation for 1978 Dodge Diplomat

Find speakers to upgrade your sound and fit in the factory speaker location for your Diplomat.  After you choose your speakers, we'll help you find speaker adapters, speaker harnesses and other accessories for installation.

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Shop All Speaker Locations in the Vehicle

See all speakers that fit, regardless of location.

Dash Corner

Dash Corner Speakers

Speakers for your dash corner

Front Door Panel Speakers

Front Door Speakers

Speakers for your front door panels

Rear Deck Corner

Rear Deck Corner Speakers

Speakers for your corner rear deck

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Speaker Location
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
  Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
Shallow Mount Installation
This means that the subwoofer/speaker is designed to be installed in areas that do not have a lot of space. Shallow mount subwoofers are typically found under a seat or behind the seat in some trucks.

Shallow mount speakers will typically have a mounting depth of 2" or less, while shallow mount subwoofers will typically have a mounting depth of 3" or less.
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Series
Many brands group their products into series or lines of products to help customers know the level of quality (good, better, best for example). You can filter by series and the brand using our guided browsing.
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Soundstream RS.57

240W Peak (120W RMS) 5x7" Reserve Series 4-ohm Full-Range Car Door Speakers

RS.57 big
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Soundstream RS.57

240W Peak (120W RMS) 5x7" Reserve Series 4-ohm Full-Range Car Door Speakers

• 120 watts Peak Each, 60 watts RMS Each
• 3/4" Woven Poly-nylon Synthetic Soft Dome tweeters on Kapton former
• Mica Reinforced Pulp cone material with crystalline additive
• Impedance: 4 ohm
• Sensitivity: 87.5 dB

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Free or discounted install kits when available.

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List price $57.99
Save 22%
-22% $44.99 /pair

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Soundstream RS.57 with Installation Accessories

240W Peak (120W RMS) 5 x 7" Reserve Series Coaxial Speakers with 20mm Soft Dome Tweeters

RS.57, FRING68, SDSK2, SDRLR1, BTK106 big
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Soundstream RS.57 with Installation Accessories

240W Peak (120W RMS) 5 x 7" Reserve Series Coaxial Speakers with 20mm Soft Dome Tweeters

• 120 watts Peak Each, 60 watts RMS Each
• 3/4" Woven Poly-nylon Synthetic Soft Dome Tweeters
• Mica Reinforced Pulp cone material
• Impedance: 4 ohm
• Sensitivity: 87.5 dB

shipping truck icon Free shipping in USA. Provide zip for delivery date.
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Free or discounted install kits when available.

Fits select models only.
Add details to confirm fitment.
256
List price $139.70
-40% $83.62 /pair

In stock

Add to Cart

• 120 watts Peak Each, 60 watts RMS Each
• 3/4" Woven Poly-nylon Synthetic Soft Dome Tweeters
• Mica Reinforced Pulp cone material
• Impedance: 4 ohm
• Sensitivity: 87.5 dB

 
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    FAQ for Speakers in 1978 Diplomat

    Q: Can I upgrade or change the Speakers in 1978 Dodge Diplomat?

    A: Yes this page includes all the best Speakers that work in your Diplomat.

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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.

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