Deep, Fast, Road-Ready Bass for Chicago DJs: RCF SUB 9004-AS
The RCF SUB 9004-AS is a single-18" active high-power subwoofer engineered for hard-hitting low end that translates from downtown clubs to mobile wedding ballrooms. Its hyper-ventilated neodymium 18" driver (4.0" voice coil) couples with a 2,800 W digital amplifier to produce authoritative 30–400 Hz extension and a peak output of 136 dB SPL.
A low-noise 32-bit DSP manages soft-clipping limiters, RMS protection, polarity, EQ, amplitude, timing and selectable presets, while RDNet puts full networked control and monitoring at your fingertips. On the rear panel, you'll find direct access to sensitivity, low-cut, crossover, volume, bypass, delay and preset selection—so you can tune fast and keep the dance floor moving.
Built for the grind, the Baltic birch cabinet features a heavy-duty coating, steel grille, dual M20 pole mounts (top and side), and a Vibrostop floating aluminum amp panel for extra protection in transport. Add the detachable Kart dolly and this sub stacks, rolls, and rigs quickly for AV rental and touring workflows.
Amplifier & DSP Snapshot: 2,800 W digital module, regulated PSU (100–260 V), forced cooling; hi-pass options at 35/50 Hz; variable low-pass 50–400 Hz; onboard delay and cardioid-ready presets.
Integration Wrap: XLR I/O plus RDNet etherCON streamline daisy-chains and networked optimization. Whether you need an infra-leaning preset for big rooms or extended-low for punchy club mixes, the SUB 9004-AS locks in quickly.
- Real-World Applications and Sound Roles:
- Club installs seeking tight, musical 30–80 Hz punch under compact tops
- Mobile DJ rigs needing fast load-ins, M20 pole mounting, and networked control
- Corporate AV and live events requiring precise delay alignment and cardioid options
- Rental inventories demanding durable birch ply, road hardware, and quick presets
Where the RCF SUB 9004-AS Excels
- Serious Output, Small Footprint: 136 dB SPL max from a single 18" keeps dance floors energized without overbuilding the rig.
- Deep, Usable Bandwidth: 30–400 Hz range covers infra-leaning presets and musical crossover points to your tops.
- Networked Control: RDNet onboard for remote DSP, monitoring, grouping, and fast room-specific tuning.
- Preset Speed: DSP-controlled input section with selectable modes (including cardioid) accelerates deployment.
- Delay on Board: Rear-panel delay (in meters) for precise alignment in distributed and stacked systems.
- Tour-Grade Build: Baltic birch cabinet, steel grille, Vibrostop floating amp panel withstand daily transport.
- Flexible Rigging: Dual M20 mounts (top/side) enable vertical or side-address setups with poles and stacks.
- Chicago-Style Turnarounds: Fast load-ins/outs with optional Kart dolly streamline wedding, club, and corporate hits.
- Clean Signal Flow: XLR I/O plus RDNet etherCON simplifies daisy-chains and networked optimization.
Control Modes for the RCF SUB 9004-AS
- Rear Encoder Functions: Input gain reduction; speaker delay (displayed in meters); preset selection with on-screen confirmation.
- Selectable Presets (examples): Infra Subwoofer (low-pass at 50/60 Hz, 20 Hz high-pass), Extended Low (30 Hz HPF with 60–90 Hz LPF options), Cardioid companion presets (front/back modules), and Low-Pass Excluded modes (20 Hz HPF, LPF moved to 400 Hz).
- Front-End DSP: Soft-clipping limiter, RMS protection, polarity, EQ, amplitude, timing—managed locally or via RDNet.
- Filter Points: Hi-pass selections at 35 Hz and 50 Hz; variable low-pass from 50–400 Hz for seamless top pairing.
- Connectivity: XLR in/out (bal/unbal), RDNet etherCON in/out; input sensitivity +4 dBu reference.
- Power & Cooling: Regulated PSU (100–260 V) maintains full power; forced cooling for stability under load.
- User Feedback: Status LEDs for signal, power, limiter, and function states to confirm adjustments at a glance.
Hyper-Ventilated Neodymium 18" Driver
The 4.0" inside/outside voice coil on a reinforced fiberglass former couples with a hyper-ventilation system to minimize power compression and maintain punch at peak levels. A composite cone (carbon fiber, fiberglass, cellulose) resists deformation for clean transients and long-term reliability.
Top-End Electronics & Floating Amp Chassis
A low-noise 32-bit DSP oversees limiting, EQ, timing, and presets, while the 2,800 W digital amplifier rides on a Vibrostop floating aluminum panel to isolate shocks during transport. A regulated power supply delivers consistent output from 100–260 V.
RDNet: Networked Control for Real-World Rigs
With RDNet onboard, you can monitor, group, and fine-tune devices from a central interface. Load presets, align delay, and keep eyes on status across multiple subs in clubs, ballrooms, and arena-scale deployments.
Tour-Ready Baltic Birch Cabinet
The birch enclosure with heavy-duty coating, steel grille, and dual M20 mounts supports stacking and pole-mounting. Optional Kart dolly accelerates load-ins for AV rental teams and mobile DJs covering multiple rooms per night.
How to Deploy the RCF SUB 9004-AS in the Field
Start with the venue's coverage and stage layout, then choose presets and crossover points that complement your tops. For club installs, Extended Low presets with 70–90 Hz low-pass often yield tight, musical punch. For larger rooms, Infra presets can extend the feel below 50–60 Hz while tops handle the rest.
- Stacking & Pole-Mounting: Use the dual M20 mounts (top/side) to orient the enclosure for sightlines and coverage. Keep pole-mounted tops aligned with audience ear height.
- Cardioid Arrays: Build 3-box groups with two forward-facing units (standard presets) and one rear-facing unit (cardioid preset). Match gain, delay, and filters across the group for effective rear rejection.
- Delay Alignment: Apply onboard delay (in meters) to align subs with mains. Measure distance offsets and round to the nearest 0.1 m for precision at shorter throws.
- Filter Strategy: Select 35/50 Hz hi-pass to protect excursion as needed; set low-pass anywhere from 50–400 Hz for seamless crossover to compact or large-format tops.
- Power & Daisy-Chain: Use Powercon IN/OUT for secure AC runs; observe current limits when chaining devices. Keep signal XLR lines separate from AC and speaker paths.
Align delay, choose the right preset, and the SUB 9004-AS delivers fast, musical impact that keeps Chicago dance floors packed all night.
Why Choose the RCF SUB 9004-AS from AVMaxx
We outfit Chicago DJs, clubs, and AV rental teams with subs that hit hard and deploy fast. The SUB 9004-AS checks every box: RDNet for networked control, real-world presets for quick room fits, and a birch cabinet built for the grind. We translate manufacturer data into field-ready settings and help you pick crossover points, delays, and cardioid groupings that suit your rooms and tops.
- Chicago-Tuned Guidance: Recommendations shaped by ballroom, lounge, and warehouse use cases.
- Deployment Support: From preset selection to delay alignment, we help you get it right the first time.
- Rig-Building Insight: Pairings for pole-mount, stacks, and distributed fills using your existing inventory.
AVMaxx is your partner for RCF solutions—field-aware recommendations, dependable support, and builds that help Chicago DJs and event pros perform with confidence.
Frequently Asked Questions — RCF SUB 9004-AS
What is the maximum output and frequency range?
The SUB 9004-AS is rated up to 136 dB SPL with a usable frequency range of 30–400 Hz.
Does it support networked control?
Yes. RDNet is onboard for remote monitoring, grouping, and full DSP control over compatible devices.
Which presets work best for DJ use in clubs?
Extended Low presets with low-pass points around 60–90 Hz are common for punchy club mixes. Infra presets (50/60 Hz LPF) suit larger rooms needing deeper feel.
Can I build a cardioid sub array with the SUB 9004-AS?
Yes. Use groups of three with two boxes facing forward and one facing backward; apply the matching cardioid preset and align gain, delay, and filters across the group.
What connections and power options are available?
XLR input/output and RDNet etherCON are provided, plus locking Powercon IN/OUT. The regulated PSU operates from 100–260 V.
Tell us your tops and room dimensions—AVMaxx will recommend presets, crossover targets, and delay values tailored to your Chicago gigs.
