- +Complete onboard kit: quad horn, 150 PSI compressor, 1.5-gallon tank, switch, gauge, safety valve, fuse and hardware
- +Unusually full spec sheet: 25% duty cycle at 100 PSI, 18A draw, 1.1 CFM and tank ratings all published
- +120–150 PSI pressure switch runs the horn higher than Vixen's 1-gallon kit (90–115 PSI)
- +Automatic-reset thermal overload, 175 PSI safety valve and drain valve included
- +All-metal black horn; tank is precision-welded with an anti-corrosion coating
- +12-month warranty plus lifetime tech support and a downloadable install guide
- −No decibel rating published for the kit, at any distance
- −No chord frequencies (Hz) disclosed
- −1.5-gallon tank still limits you to short blasts
- −25% duty cycle at 100 PSI means the compressor needs rest after hard use
- −Install guide recommends professional installation; drilling required for all three components
- −Warranty shipping is paid by the buyer
Methodology
This review aggregates publicly available information from manufacturer specifications, retailer listings, and verified user reviews. We do not perform hands-on testing. Last reviewed: 10/30/2026. For this article we used Vixen Horns’ official product page for this exact SKU, its sibling variant pages, Vixen’s published warranty policy, the kit’s six-page installation guide (hosted by authorized dealer HookedOnTronics), and Amazon’s listing for the VXO8715 air system sold on its own. Every number in the spec table comes from a source listed at the bottom of the page. Anything that reads as a judgment call is our editorial opinion.
Quick verdict
The Vixen Horns VXO8715/4114B is the step-up version of Vixen’s entry-level quad-trumpet kit. It pairs the black all-metal 4114 horn with a separate 150 PSI compressor, a 1.5-gallon steel tank and a 120–150 PSI pressure switch, all for about $193 direct. What stands out is the paperwork: Vixen publishes duty cycle, amp draw, flow rate, tank pressure ratings and full dimensions, which many budget brands never do. The trade-offs are typical Vixen ones. There is no decibel rating at all, no chord frequencies, and a tank that is still small enough to limit you to short blasts. We rate it 3.7/5. It’s a solid, well-documented one-box kit for first-time installers who want more pressure headroom than the 1-gallon kits offer. It isn’t the right pick for buyers chasing long, sustained honks.
What it is
The VXO8715/4114B is a complete 12-volt onboard train horn system sold as one SKU. It combines Vixen’s black quad-trumpet horn, the 4114B (the black twin of the chrome horn in our Vixen Horns VXH4114 review), with Vixen’s VXO8715 onboard air system: a 1.5-gallon tank and a stand-alone 150 PSI compressor. Vixen’s product page describes the horn as made entirely of metal with a black finish. The tank is listed as precision-welded with an anti-corrosion coating.
Vixen’s cheaper VXO8210/4124B kit bolts its compressor directly onto a 1-gallon tank. This kit uses separate components instead, so you can mount the compressor and the tank in different spots. That helps in tight engine bays and under-bed installs. The kit targets pickup, SUV, Jeep, RV and car owners with a standard 12V system who want a real air horn without sourcing parts one by one. Our Vixen Horns hub lists every model of theirs we’ve covered.
Specifications
| Spec | Value |
|---|---|
| Kit configuration | Quad-trumpet horn + separate 150 PSI compressor + 1.5-gallon tank |
| Horn | Quad trumpet, black, all-metal construction |
| Trumpet lengths | 13-3/4”, 11-1/2”, 9-1/4”, 7-3/4” (3-3/4” bell diameter) |
| Horn dimensions (overall) | 14” L × 6-3/4” W × 6-1/2” H |
| Advertised sound level | Not published by Vixen for this kit (no dB, no test distance) |
| Chord frequencies | Not disclosed |
| Horn valve | 12V electric air valve (solenoid) with compression fitting |
| Compressor max working pressure | 150 PSI |
| Compressor duty cycle | 25% @ 100 PSI |
| Compressor amp draw | 18A |
| Compressor flow rate | 1.1 CFM @ 0 PSI |
| Compressor design | Oil-less, 12V permanent-magnet motor, anodized aluminum cylinder, built-in intake filter |
| Compressor protection | Automatic-reset thermal overload protector |
| Compressor dimensions | 7” L × 3-1/4” W × 5-3/4” H |
| Tank capacity | 1.5 gallons (6 liters) |
| Tank pressure rating | 150 PSI working, 200 PSI max |
| Tank ports | 6 × 1/4” NPT |
| Tank dimensions | 15” L × 7-1/2” H × 5-1/2” diameter |
| Pressure switch | 120 PSI on / 150 PSI off |
| Safety valve | 175 PSI |
| Fuse | 30A in-line, waterproof holder |
| Voltage | 12V DC |
| Listed weight | 19.0 lb (Vixen store listing) |
| Price | $193.07 direct (compare-at $260.95) as of 10/30/2026 |
| Warranty | 12 months, original purchaser; lifetime tech support |
Two gaps stand out. Vixen publishes no decibel number for this kit, so there’s nothing to compare against louder or quieter rivals. That beats an inflated headline figure, but it leaves buyers guessing. Retail listings for the related horn-only VXH4114 advertise 149 dB without a test distance, and we covered why those figures shouldn’t drive a purchase in our advertised vs real-world decibels guide. Chord frequencies aren’t published either. Apart from those two gaps, this is one of the more complete spec sheets in the budget kit segment.
What’s in the box
The official product page and the installation guide list the same contents:
- Quad-trumpet train air horn (black, metal)
- 12V electric air valve (solenoid) with compression fitting
- 150 PSI 12V air compressor with stainless braided leader hose and inline check valve
- 1.5-gallon air tank with mounting brackets
- 240 PSI air pressure gauge
- 120–150 PSI pressure switch
- 175 PSI safety valve
- 1/4” NPT wing-style drain valve
- 1/4” NPT compression fitting and hex-head plug
- 1/4” OD nylon air line (6 feet)
- 12 mm thread sealant tape (16 feet)
- 30A in-line fuse with waterproof holder
- Horn button and mounting hardware
Not included: power wire. The guide calls for 12-gauge or thicker wire to the compressor and recommends keeping that run short. Budget for wire, ring terminals and loom.
Pros
- A genuinely complete kit, so one order covers the horn, air supply and safety hardware
- A full compressor spec sheet (duty cycle, amps, CFM) that many budget rivals never publish
- A 120–150 PSI operating window, higher than the 90–115 PSI switch in Vixen’s 1-gallon kit
- An automatic-reset thermal overload, 175 PSI safety valve and drain valve in the box
- A separate compressor and tank, which gives more mounting flexibility than an integrated unit
- A 12-month warranty, lifetime tech support and a clear six-page install guide
Cons
- No decibel rating at any distance, which makes paper comparisons impossible
- No published chord frequencies
- The 1.5-gallon reservoir still only supports short blasts
- A 25% duty cycle at 100 PSI means the compressor needs cool-down time after heavy use
- Professional installation is recommended, and every component needs drilled mounting holes
- Warranty-claim shipping is on the buyer
Alternatives
- Vixen Horns VXO8210/4124B is the cheaper (~$171) all-in-one sibling. It has a flatter 4124B horn and an integrated 1-gallon tank and compressor, but a lower 90–115 PSI switch. Our full review: Vixen VXO8210/4124B.
- Vixen Horns VXH4114 is the chrome horn alone, at around $82. It makes sense if you already run onboard air from a suspension system or welding rig. Our full review: Vixen VXH4114.
- Kleinn HK2 costs more and uses a much smaller 0.5-gallon system, in exchange for a tighter, more compact package. Our full review: Kleinn HK2.
For a broader brand comparison, see HornBlasters vs Vixen and Vevor vs Vixen vs Viking.
Install / compatibility notes
The kit is designed for any vehicle with a 12V DC electrical system. The install guide is unusually specific, and these points are worth knowing before you start:
- Horn. Mount it to a rigid sheet-metal surface such as the frame or body, never to plastic or flexible material. You’ll need roughly 14” × 7” × 7” of space for the horn cluster.
- Compressor. Pick a dry spot close to the battery. If it goes in the engine bay, mount it as far forward as possible, away from exhaust heat. Do not rotate or remove the inline check valve on the braided hose, because Vixen warns that this damages its seals.
- Tank. Bolt it down with the supplied brackets, keeping the six 1/4” NPT ports reachable. Install the gauge on the side or top of the tank so condensation stays out of it.
- Wiring. Connect the compressor’s red lead to a source that is only live with the ignition on (the guide suggests the wiper motor, blower motor or an accessory fuse terminal). Run the black lead through the pressure switch to a clean ground, using 12-gauge or thicker wire.
- Leak check. If the compressor never reaches the 150 PSI cut-off, spray soapy water on every joint and re-seal with the included tape.
Two ownership notes from the guide. First, keep the engine running while the compressor works, because an 18A draw will flatten a resting battery. Second, drain condensation regularly by bleeding the tank down to about 5–20 PSI and opening the bottom drain. Our tank draining guide walks through the routine, and our compressor duty cycle explainer covers what 25% at 100 PSI means in practice. If the thermal overload trips, Vixen says to cut power and let the compressor cool for about 30 minutes. Our thermal overload guide has more troubleshooting.
On tank size: 1.5 gallons is a modest step up from Vixen’s 1-gallon kit, but it’s still a short-blast setup. If you want longer, chord-holding honks, read our air tank size guide before you buy. Before you sound the horn on public roads, check the rules for your state in our state legality guides.
Sources
- Vixen Horns — VXO8715/4114B product page — kit description, all horn, compressor and tank specs (dimensions, duty cycle, amp draw, CFM, PSI ratings, ports), included items, $193.07 price / $260.95 compare-at, 19.0 lb listed weight
- Vixen Horns — VXO8715B/4114B product page — black-compressor variant description and $193.17 price
- Vixen Horns — VXO8715/4114 (chrome) product page — chrome-horn variant price ($194.27)
- Vixen Horns — Full Systems collection — the brand’s lineup of complete onboard kits, including the VXO8715 family
- Vixen Horns — Warranty policy — 12-month warranty to the original purchaser, exclusions, buyer-paid shipping, lifetime support
- VXO8715/4114B Installation Guide (PDF, via HookedOnTronics) — box contents, 120/150 PSI switch points, 175 PSI safety valve, 12-gauge wire requirement, mounting and wiring steps, thermal overload reset, drain procedure
- Vixen Horns — VXO8210/4124B product page — sibling kit’s $170.97 price, 1-gallon tank and 90/115 PSI pressure switch
- Vixen Horns — VXH4114 product page — horn-only VXH4114 price ($82.37)
- eBay — Vixen Horns 149 dB four-trumpet VXH4114 product page — the 149 dB figure advertised on retail listings for the VXH4114, with no test distance
- Kleinn — Model HK2 Dual Truck Horn Kit listing — HK2’s 0.5-gallon air tank and package contents
- Amazon — Vixen Horns VXO8715 1.5-gallon tank and 150 PSI compressor listing — cross-check that the VXO8715 air system is sold separately as a 1.5-gallon, 150 PSI kit
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
A well-documented ~$193 one-box quad-trumpet kit for first-time installers who want more pressure headroom than Vixen's 1-gallon kits. Buyers who want sustained blasts or a published decibel rating should look at bigger-tank systems.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- How loud is the Vixen Horns VXO8715/4114B?
- Vixen does not publish a decibel rating for this kit at any distance. Its product page only calls it 'a bold, loud choice.' Retail listings for the related horn-only VXH4114 advertise 149 dB without a test distance, so treat any number you see as marketing. Real output depends on the 120–150 PSI range set by the included pressure switch.
- What's the difference between the VXO8715/4114B and the VXO8715B/4114B?
- Both kits use the same black quad-trumpet horn and 1.5-gallon tank. Vixen describes the VXO8715B version's 150 PSI compressor as black, and the two are priced within about 10 cents of each other on Vixen's site ($193.07 vs. $193.17 as of 10/30/2026). The chrome-horn VXO8715/4114 lists at $194.27.
- Does the kit come with everything needed to install it?
- Mostly. The box includes the horn with a 12V solenoid, compressor, 1.5-gallon tank, 120–150 PSI pressure switch, 240 PSI gauge, 175 PSI safety valve, drain valve, fittings, 6 feet of 1/4-inch air line, thread tape, a 30A fuse, a horn button and mounting hardware. Per the install guide, you supply 12-gauge or thicker power wire and choose an ignition-switched power source.
- How hard can I run the compressor?
- Vixen rates it at a 25% duty cycle at 100 PSI with an 18A draw. That works out to roughly 15 minutes of running per hour at that pressure. If the automatic-reset thermal overload trips, the install guide says to cut power and let the compressor cool for about 30 minutes.
- What warranty does the VXO8715/4114B carry?
- Vixen Horns covers its products for 12 months from purchase, for the original purchaser, against defects in materials and workmanship. The buyer pays shipping on claims, and Vixen offers lifetime technical support.
