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2020 Toyota Avalon
Your 2020 Toyota Avalon is a strong platform for a full build: a sealed trunk that makes for great bass, front door openings large enough for 6x9 component sets, and rear doors that fit 6.5s. The one constraint is the factory dash — it's integrated and stays, so you'll use an integration adapter to pull a clean signal and feed the amp. There's no factory amp, so you're starting from a clean slate on the power side. The build order is straightforward: front component sets (6x9 woofers with the separate tweeters placed correctly), rear 6.5s, a proper sub in a sealed or ported trunk enclosure built to the sub's specs, and an amp system to drive all of it. Do everything at once — this is what a full build looks like.
The upgrade path
4 steps · ordered by impact · with DIY difficultyYour 2020 Toyota Avalon's dash screen is factory-integrated — it handles HVAC, vehicle systems, and more, so swapping it out isn't the right path. For a full system build, the correct move is to leave the screen in place and use a vehicle-specific integration kit to pull a clean signal out of it. Brands like Metra, Scosche, and iDatalink make adapters built for exactly this situation — they convert the factory head unit's output into a clean line-level signal for an aftermarket amplifier, and many preserve steering-wheel controls and retain the factory display. This is the foundation of the whole build: the integration kit is what connects your factory dash to the aftermarket amp, speakers, and sub you're adding.
No head-unit swap here — your factory screen stays. The right vehicle-specific integration adapter for your build is matched in a later step of the rollout.
A full system build in your 2020 Toyota Avalon starts with every speaker location — and this sedan has a clear plan: 6x9 component set up front with the tweeters handling the high end cleanly, and 6.75-inch speakers in the rear doors to complete the stage. At a premium budget, you do all four doors in one build rather than staging it. The front components set the soundstage and imaging; the rear fill keeps the cabin balanced so the sub you're adding doesn't feel disconnected from the rest of the music. No factory amplifier means head-unit power is feeding everything right now, which is part of why the full build includes an amp at the next step — the speakers deserve clean, adequate power to deliver what they're capable of. See the Best Car Speakers by Size guide for front and rear options.
Why it’s the pick: DFS cones, butyl surrounds and a rotating aluminum inverted-dome tweeter make the 690AC a tough, musical 6x9" that plays low without getting muddy. If you’re replacing factory 6x9…
No factory subwoofer means you're starting with a clean install in the trunk. For a full system build, choose a quality component sub and have a custom enclosure built — ported or sealed based on the sub's specs and how you want the bass to feel. The trunk in a sedan is purpose-built for this: sealed off from the cabin, enough depth for a real enclosure. Plan the box dimensions early to make sure the sub's required internal volume fits the trunk while leaving room for spare gear. A properly built enclosure matched to the sub's specs makes a bigger difference in sound quality than the subwoofer brand alone.
Why it’s the pick: JL’s W7 has been the reference standard for two decades because it blends control and command: deep extension without bloat, slam without smear. Its W-Cone assembly and OverRoll s…
A full system build without a factory amp means you're adding proper amplification from scratch — and at a premium budget, that's the right situation to be in. You choose the amp configuration rather than inheriting a factory unit. Plan for enough channels to power every speaker you're running, plus a dedicated mono channel for the sub. That can be a single multi-channel amp or a two-amp setup (one for speakers, one mono for the sub) — either works; it's a matter of installation space and how you want to wire the system. Because your dash is factory-integrated, the integration kit from the head unit step is what feeds the amp a clean signal. Wire that correctly and the amp has everything it needs to drive the full system.
Why it’s the pick: VXi gives pro-grade tuning without extra boxes. JL’s NexD2 Class-D platform is efficient and quiet, and the integrated DSP plus TüN™ software can run active fronts and a sub from…
2020 Toyota Avalon audio — common questions
What size speakers fit a 2020 Toyota Avalon?
The 2020 Toyota Avalon uses 6×9 + tweeter front speakers and 6.5" rear speakers.
Does the 2020 Toyota Avalon have a factory amplifier?
No factory amp — the 2020 Toyota Avalon drives its speakers off the head unit, so adding a compact 4-channel amp later gives the new speakers clean, properly rated power.
What is the best subwoofer setup for a 2020 Toyota Avalon?
For the trunk, an all-in-one powered sub is the easiest big win; a slim/shallow sub keeps more trunk space, and a component sub + box delivers the most output.
Can you replace the head unit in a 2020 Toyota Avalon?
The 2020 Toyota Avalon uses a factory-integrated screen, so the move is to keep the screen and integrate a clean signal with the right vehicle-specific adapter — not a head-unit swap.
Everything on CarAudioNow for your 2020 Toyota Avalon
Fitment is a guide, not a guarantee. Speaker sizes and fit details are based on your selected year, make, model, and audio package and can vary by trim, options, and prior modifications — always confirm before buying.
Your plan is guidance built from your selections (vehicle, goal, budget), not a guarantee of fit, sound, or results, and not a substitute for professional installation advice. Prices are pulled from retailers and may change at checkout.
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