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JUICE
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Juice: understand the range before choosing
Juice is a car-audio brand. The page contains two pairs of 2-way coaxial speakers: JS420, a 10cm or 4-inch pair rated at 25W RMS per speaker and 220W maximum for the pair; and JS620, a 6.5-inch or approximately 17cm pair rated at 40W RMS per speaker and 300W maximum for the pair. Both are published as 4-ohm speakers, but their mounting depth and physical interface differ.
AutoMotoPart currently lists 2 Juice items. The largest Juice groups are 2 audio visual entries. Juice totals can change, so a category count is orientation rather than proof that a particular reference suits a vehicle, workplace or job. The exact Juice listing, its current technical information and the item in front of you must agree.
What the Juice page actually covers
| Product group in this range | Current entries | Selection focus |
|---|---|---|
| Audio Visual | 2 | The two audio entries are pairs of 2-way coaxial speakers; choose 10cm JS420 or 17cm JS620 by the actual mounting location. |
There are two distinct speaker sizes and each listing represents a pair. JS420 is 10cm, 25W RMS each, 220W peak per pair and 43mm deep. JS620 is about 17cm, 40W RMS each, 300W peak per pair and 55mm deep. Both are 4 ohms. Shipping-box dimensions in the live description are not mounting dimensions.
Build a reliable shortlist
Remove no trim until vehicle-specific instructions are available. Use existing speaker records or inspect safely to measure basket diameter, cut-out, mounting holes, depth at all window positions, connector and polarity. Note factory amplification, active crossovers, unusual low-impedance speakers and diagnostic circuits.
| Check | Why it matters | Useful evidence |
|---|---|---|
| Diameter | 10cm and 17cm nominal classes do not share apertures | Measured cut-out, basket and grille opening |
| Depth | Window glass and mechanisms move behind door speakers | 43mm JS420 or 55mm JS620 plus terminal clearance |
| Impedance | The source must operate safely into the connected load | 4-ohm speaker and head-unit or amplifier manual |
| Power | RMS guides continuous matching; peak is not a gain setting | 25W or 40W RMS per channel and clean output |
| Interface | Factory plugs and shaped baskets may need adaptors | Vehicle bracket, connector and polarity map |
| Environment | Doors expose speakers and wiring to vibration and moisture | Barrier, gasket, drain and protected cable route |
If the vehicle uses a component system with a separate tweeter and crossover, replacing one woofer with a coaxial can duplicate high frequencies or disturb filtering. Map the whole channel before deciding that a 2-way coaxial is the correct replacement.
JS420 10cm 2-way coaxial pair
Published JS420 data lists a 4-inch or 10cm polypropylene-cone coaxial speaker with butyl-rubber surround, PEI dome tweeter, 4-ohm impedance, 25W RMS per speaker, 220W maximum per pair, 89dB sensitivity and 43mm mounting depth. The compact size can suit some dashboards, doors or parcel-shelf positions, but no vehicle application is contained in the live listing.
Dashboard locations can have shallow ducts, windscreen clearance and fragile grilles. Door locations add glass travel and moisture. Measure the narrowest basket point and terminal projection rather than only the 43mm magnet depth. A spacer changes grille clearance and may move the cone into trim. Confirm screws do not penetrate wiring, airbags or structural parts.
JS620 17cm 2-way coaxial pair
JS620 is published as a 6.5-inch, approximately 17cm pair with polypropylene cone, butyl surround, PEI dome tweeter, 4-ohm impedance, 40W RMS per speaker, 300W maximum per pair, 92dB sensitivity and 55mm mounting depth. Its larger cone and rating do not prove it will play louder or lower in a particular door; installation and source dominate the result.
Many factory 165mm or 170mm speakers use moulded offset baskets that are not a simple round replacement. Check opening, fixing ears, spacer thickness, trim and window. Do not cut a structural door pressing or side-impact feature to gain clearance. Use a rigid moisture-resistant adaptor that seals front output from rear output and preserves drainage.
RMS, peak power and 4-ohm matching
RMS figures are the useful continuous reference: 25W for each JS420 and 40W for each JS620. The advertised 220W and 300W are maximum figures for the pairs and must not be divided into arbitrary amplifier gain settings. Amplifier power ratings must be compared at 4 ohms per channel using the same measurement basis.
Set gain with a clean source and suitable method, not by using it as a volume control. High-pass filtering can reduce damaging low-frequency excursion in small speakers. Distortion, burning smell, mechanical knocking or sudden level change requires an immediate stop. Do not assume a factory radio's labelled total wattage equals clean RMS output available to each speaker.
Vehicle connectors, polarity and factory systems
Use plug adaptors where available rather than cutting the vehicle harness. Identify positive and negative by a diagram or controlled test; consistent polarity supports coherent output. Crimp or solder only by an approved automotive method, insulate joints and provide strain relief. Route cable away from regulator arms, sharp edges, water paths and airbag deployment zones.
Factory amplified systems may use equalisation, active crossovers, shared grounds, bridge-tied outputs or impedance below four ohms. Connecting a different load can reduce level, trigger protection or damage equipment. Retained warning chimes and hands-free audio can also depend on the speaker path. Obtain system data before bypassing an amplifier or combining channels.
Installation, sealing and listening checks
Follow safe trim removal and battery procedures, accounting for radio codes, windows and restraint systems. Support panels, replace broken clips and never probe yellow or identified airbag wiring. Fit a suitable gasket so sound does not leak around the frame, tighten evenly without distorting the basket and ensure the cone and tweeter cannot touch the grille.
Before final assembly, move the window through its full travel and inspect every wire and fastener. Test each speaker at low level for polarity, rubbing and rattles, then restore trim and vehicle functions. Equalise conservatively after both sides are secure. Sound comparisons should use the same source and level; a new speaker is not guaranteed to correct poor recording, panel resonance or amplifier noise.
From identification to a checked result
| Stage | Good practice for this range | Mistake to avoid |
|---|---|---|
| Survey | Measure aperture, depth, holes, grille and moving clearances | Buying by 10cm or 17cm title alone |
| Map | Identify 4-ohm source, RMS power, crossover, plug and polarity | Matching an amplifier to peak wattage |
| Prepare | Isolate safely and obtain brackets, adaptors, gasket and clips | Cutting the factory harness or structure |
| Install | Seal, strain-relieve and clear glass, drainage and airbags | Leaving wires or barrier loose inside a door |
| Verify | Test low, check window and functions, then tune conservatively | Promising a sound improvement before installation |
Record mounting adaptor, polarity, source settings and crossover frequency. If a future speaker fails or trim rattles, those details separate an electrical overload from an installation or vehicle-panel issue.
Reading real Juice references
The Juice names below are examples from the current range and show why the complete description matters. They are not universal Juice recommendations and should not be treated as a fitment list. Within Juice, a shared family word can conceal a different dimension, connector, material, pack format, operating condition or installation side.
| Example listing | What to verify beyond the name |
|---|---|
| Juice JS420 2Way Coaxial Car Door / Dashboard Speakers | JS420 pair: 10cm, 25W RMS each, 220W peak pair, 4 ohms and 43mm depth |
| Juice JS620 2Way Coaxial Car Door Dashboard Speakers | JS620 pair: 17cm, 40W RMS each, 300W peak pair, 4 ohms and 55mm depth |
Live length, width and weight values describe retail packaging and cannot prove door or dashboard fit. The phrases quick to install and excellent audio quality are promotional; compatibility and result depend on measured vehicle and system evidence.
Common errors around Juice products
- Treating 220W or 300W peak-per-pair figures as continuous power per speaker.
- Choosing JS420 or JS620 only from nominal diameter without measuring cut-out and depth.
- Ignoring terminal clearance or window travel behind the published mounting depth.
- Connecting a 4-ohm pair to an incompatible factory amplifier or parallel load.
- Cutting vehicle plugs or drilling panels before checking adaptor options and hidden equipment.
- Breaking a door moisture barrier or routing wires through drainage and airbag areas.
- Setting amplifier gain by ear at full volume and driving the speaker into clipping or excursion.
- Guaranteeing improved bass, loudness or sound quality in every cabin.
Juice questions and answers
Q: What size is JS420?
A: It is a 4-inch or 10cm 2-way coaxial speaker pair.
Q: What is JS420 RMS power?
A: The published rating is 25W RMS per speaker.
Q: What does 220W mean for JS420?
A: It is the maximum or peak figure for the pair, not RMS per speaker.
Q: How deep is JS420?
A: The published mounting depth is 43mm, before allowing for terminals and clearance.
Q: What size is JS620?
A: It is a 6.5-inch, approximately 17cm 2-way coaxial pair.
Q: What is JS620 RMS power?
A: The published rating is 40W RMS per speaker.
Q: What does 300W mean for JS620?
A: It is the pair's maximum or peak figure, not continuous power.
Q: How deep is JS620?
A: The published mounting depth is 55mm plus required connector clearance.
Q: What impedance are both models?
A: Both are published as 4-ohm speakers.
Q: Will they connect to every factory radio?
A: No. Check amplifier topology, impedance, plugs, filtering and available clean RMS output.
Q: Are vehicle fitting parts included?
A: Generic wires and hardware are listed, but vehicle-specific brackets and connectors are not evidenced.
Q: Will either pair sound better than factory speakers?
A: No universal result can be promised; installation, source, enclosure, tuning and cabin all matter.
