Low-End Authority for Chicago DJs — RCF SUB 8004-AS
RCF SUB 8004-AS is a road-tough 18" active sub engineered for clean, high-impact bass where it counts. A hyper-vented 18" woofer with a 4.0" inside/outside voice coil couples to a Class-D amplifier delivering 2500 W peak / 1250 W RMS for confident headroom. The focused 30-120 Hz bandwidth stays tight on kick while reaching deep for modern dance content, and the system reaches up to 136 dB max SPL without getting smeared.
The Baltic birch enclosure, powder-coated steel grille with acoustic foam, and ergonomic side handles are built for daily transport. Balanced XLR input/link, a dedicated XOVER high-pass output for satellites, and Powercon IN/OUT keep rigs neat and reliable. On-box DSP gives you Deep/Punch voicings, 90/120 Hz crossover selection, phase invert, and time delay set in meters, with thermal/RMS protection and a fast limiter to preserve clarity at show volume.
It drops seamlessly into RCF ecosystems: stacking compatibility with NXL23-A and NXL24-A, plus multiple configurations with HDL 10-A and HDL 20-A, make the SUB 8004-AS a flexible anchor for mobile events, clubs, and installs.
- Real-World Applications and Sound Roles:
- Ballrooms and weddings needing deep 30-50 Hz weight without mud
- Club takeovers where 70-90 Hz punch locks the dance floor
- Corporate AV and installs that demand controlled LF and clean cabling
- Outdoor stages using cardioid groups to keep LF off mics and backline
Where the RCF SUB 8004-AS Excels
- Serious Output: Up to 136 dB max SPL for confident headroom in larger rooms.
- Deep and Defined: 30-120 Hz bandwidth balances reach with tight kick articulation.
- Tour-Ready Build: Baltic birch plywood, steel grille with acoustic foam, ergonomic handles.
- Smart Power: 2500 W peak / 1250 W RMS Class-D with SMPS and convection cooling.
- Selectable Voicing: Deep for flat extension, Punch for added 70 Hz impact.
- Clean Signal Flow: Balanced XLR I/O plus XOVER high-pass output for tops.
- Fast Alignment: Time delay set in meters and on-box phase invert.
- Cardioid Ready: On-board cardioid switch supports 3-box gradient arrays.
- Rigging Flex: M20 pole mount; stacks with NXL23-A and NXL24-A; works with HDL 10-A and HDL 20-A.
- Built for Chicago DJs: Optimized for quick turnovers and reliable mobile deployment.
Control Modes for RCF SUB 8004-AS
- Input Sensitivity: Rotary from maximum attenuation to -2 dBu (MAX); center detent at +4 dBu nominal.
- Deep/Punch: Choose Deep for flat low extension or Punch for boosted energy near 70 Hz.
- XOVER 90/120 Hz: 24 dB/oct low-pass at 90 Hz (released) or 120 Hz (pressed); matching high-pass available on XOVER output for satellites.
- Phase Invert: 0 or 180 degrees for quick polarity checks.
- Time Delay: Alignment delay entered directly in meters for distance-based timing.
- Cardioid Setup: Switch engages preset behavior for 3-cabinet gradient arrays.
- Protection/Limiting: Thermal and RMS protection; fast limiter. LEDs indicate signal, compressor, soft clip, and RMS states.
- I/O and Power: XLR input/link, XOVER output, Powercon IN/OUT; convection-cooled amplifier module.
Class-D Platform With Fast Transients
The lightweight amplifier and SMPS deliver immediate attack and strong dynamics. A rigid aluminum structure stabilizes the module and enables silent, fan-less convection cooling.
Hyper-Vented 18" Driver Architecture
A high-power 18" transducer with a 4.0" inside/outside voice coil and advanced ventilation minimizes power compression, sustaining output and clarity through long sets.
Cabinet and Mechanics for the Road
Baltic birch construction with a textured black finish and a powder-coated steel grille with acoustic foam backing. Ergonomic side handles and wheel kit provisions support quick load-ins.
Signal Flow and System Integration
Balanced XLR input and link keep runs quiet, while the dedicated XOVER high-pass output feeds your satellites. On-box DSP provides Deep/Punch voicing, 90/120 Hz crossover selection, phase control, and distance-based delay for fast alignment.
Stacks and Pairings
Stack with NXL23-A or NXL24-A; build systems with HDL 10-A or HDL 20-A. Use the appropriate fly bar and locking accessory where specified for secure, repeatable geometry.
How to Deploy RCF SUB 8004-AS in the Field
Select placement and settings to match room geometry and tops. Start with Deep for maximum extension; switch to Punch when the mix needs extra 70 Hz chest hit.
- Single or Dual: Center cluster or L/R. Verify polarity with the phase switch and adjust delay for arrival match at crossover.
- Pole-Mounted Tops: Use the M20 threaded mount and feed the satellite from the XOVER high-pass output for a clean handoff.
- With Columns: Stack with NXL23-A or NXL24-A and maintain stable bases per manufacturer guidance.
- With HDL Arrays: Pair with HDL 10-A or HDL 20-A; select 90 or 120 Hz low-pass to suit top bandwidth and SPL goals.
- Cardioid Control: Build 3-box groups: two forward with the cardioid switch released, one reversed with the switch pressed; match sensitivity, delay, and crossover.
- Power and Linking: Use locking Powercon AC connections within rated current limits. Keep AC and signal runs separated and tidy.
Aligned crossover, correct polarity, and distance-based delay turn big bass into clean, musical low end that translates across the room.
Why Choose the RCF SUB 8004-AS from AVMaxx:
We spec the SUB 8004-AS to your tops, venue, and crowd profile, then walk you through Deep/Punch selection, 90/120 Hz crossover choices, delay in meters, and cardioid grouping. From ballrooms to club installs, our guidance reflects real Chicago DJ use and fast, reliable deployment.
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 8004-AS
What output and bandwidth does the SUB 8004-AS deliver?
Maximum output is 136 dB with a 30-120 Hz operating range, driven by a 2500 W peak / 1250 W RMS Class-D amplifier.
Does it offer selectable EQ or voicings?
Yes. Use Deep for flat low-frequency extension or Punch for added energy near 70 Hz.
Is it a good fit for mobile DJs and club takeovers?
Yes. The Baltic birch build, M20 pole mount, compact footprint, and on-box delay and phase controls support quick Chicago-style turnovers.
How do I time-align or run cardioid groups?
Set delay in meters to match distance and verify polarity with the phase switch. For cardioid, use 3-cabinet groups: two forward (cardioid switch released) and one reversed (switch pressed) with matched settings.
What connections and controls are available on the panel?
XLR input/link, XOVER high-pass output, Powercon IN/OUT, Deep/Punch, XOVER 90/120 Hz, phase invert, time delay (meters), cardioid switch, and status LEDs.
Tell us your room size, crowd count, and tops—we will map crossover, delay, and voicing to hit your low-end target on the first song.
