I need speakers for a 1997 crown Victoria front and back

I recommend getting some speakers

Are they like a box to make bass better?

I do feel like the bass is more solid and better and eliminates the "boxy" sound that the door enclosure normally produces. I think it eliminates undesirable resonances that distord the clarity of the sound. If I had to chose, I would install them again. One warning, they come in different sizes and you may need to cut them to fit your door cavity. When I cut the first baffle, it was a bit lose and then it produced an undesired vibration between the plastic of the cavity and the foam baffle where they were both surfaces were barely touching. To correct this, I cut the next baffles in a way that they fitted tighter in the cavity and eliminated the noise produced by the vibration.

In some vehicles where the speakers mount on a middle steel panel and the whole shebang is then pressed against a speaker grill molded into the inner upholstered door panel, check the clearance carefully, as it varies a lot and this little thing can add enough to make a firm panel fitment a bit difficult at that corner. You can always trim the plastic grille area. This is rare, but might be important.

Would I / should I use these if I am mounting the speakers in individual cans?

I've noticed less pronounced lower frequencies, which is ok for me in trade-off as I use it to combat damging effects of water leakage from a bad window seal. If by 'can' you mean a designated enclosure; I would skip this and line with polyfill if anything. In a bare door cavity you should expect achieve cancellation of the reverb from highs and mids bouncing off metal. These are essentially 'individual cans'.

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Design Engineering 050310 Boom Mat Speaker Baffles, 4" Round (Pack of 2)

Product ID: 50386304

Details

Audio output mode
Stereo
Brand
Design
Connectivity technology
Bluetooth
Material
Polyethylene
Model name
Design Boom -
Mounting type
bracket mount

🔊Closed-cell polyethylene boosts sound clarity

🚗Reduces road noise & panel vibrations

🛠️Universal fit for seamless installation

Description

🎶 Elevate your ride’s sound game — because your speakers deserve the VIP treatment!

UNIVERSAL COMPATIBILITY - Fits most 6" x 9" oval speakers, making upgrades effortless across vehicle models.
NOISE RATTLE REDUCTION - Minimizes panel-to-frame resonance and road noise, elevating your in-car audio experience.
PRECISION SOUND ISOLATION - Enhances frequency response by damping unwanted vibrations for crystal-clear audio.
SLEEK LOW PROFILE DESIGN - Thin, conformable material fits tight spaces without bulk, delivering a professional finish.
DURABLE SPEAKER PROTECTION - Forms a moisture-resistant barrier that extends speaker lifespan by shielding from elements.

Design Engineering 050380 Boom Mat Speaker Baffles are precision-engineered closed-cell polyethylene pads designed to improve speaker performance by isolating frequency responses and reducing panel vibrations. Their thin, universal-fit design ensures easy installation in tight vehicle spaces while protecting speakers from moisture and extending their lifespan. Ideal for enhancing sound clarity and minimizing road noise in automotive audio setups.

Specifications

ASIN	B0039Z3SO8
Age Range Description	Adult
Antenna Location	Damping,Moisturizing
Audio Driver Size	10 Centimetres
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Best Sellers Rank	333,217 in Automotive ( See Top 100 in Automotive ) 18,721 in Car Mats & Carpets
Box Contents	Design Engineering Boom Mat Speaker Baffles- Pair - 4" Round
Brand Name	Design Engineering
Colour	Black
Compatible Devices	Car Audio System
Compatible with Vehicle Type	Car
Connectivity Protocol	Bluetooth
Control Method	Touch
Customer Package Type	Standard Packaging
Customer Reviews	4.4 4.4 out of 5 stars (3,246)
Enclosure Material	Polyethylene
Global Trade Identification Number	00607078503107
Is Waterproof	FALSE
Item Type Name	Design Engineering Boom Mat Speaker Baffles- Pair - 4" Round
Item Weight	18 g
MP3 player	No
Manufacturer	Design Engineering
Maximum Speaker Output Power (in watts)	100 Watts
Model Name	Design Engineering Boom Mat Speaker Baffles- Pair - 4" Round
Model Number	50310
Mounting Type	bracket mount
Network Connectivity Technology	Bluetooth
Number of Audio Channels	2.0
Number of Items	1
Number of Power Levels	1
Power Source	Corded Electric
Product Features	Water-tight protective shell, Vibration dampening, Speaker performance enhancement
Series Number	50310
Speaker Size	4 Inches
Speaker Type	Bookshelf
Specific Uses For Product	Car audio systems, Vehicle sound insulation, Noise reduction, Speaker protection
Subwoofer Speaker Diameter	4 Inches
Tweeter Diameter	1 Inches
UPC	607078503107
Unit Count	2.0 count
Warranty Type	Limited
Water Resistance Level	Water Resistant
Wireless Technology Type	Bluetooth
Woofer Driver Diameter	10.16 Centimetres

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