Slim/Fix
Slim and Flix was the original multi-room club that defined RCA's party identity for a generation of Bangkok nightlife. Two clubs and a live lounge shared a sleek glass and concrete building: Flix ran house and trance, Slim handled hip-hop and R&B, and the lounge hosted Thai cover bands. The venue closed and was replaced by Onyx. If you are researching Slim/Fix specifically, it no longer operates under that name. The spirit of its format lives on across RCA, particularly in Route 66's three-zone layout.
What to Expect
Historically a three-room concept covering multiple genres under one roof. The venue pioneered RCA's format and influenced every multi-room club that followed in Bangkok.
A Bangkok nightlife landmark that shaped RCA's identity. Now Onyx occupies the same cultural space with better production.
Historically: house/trance (Flix), hip-hop/R&B (Slim), Thai live covers (lounge)
Smart casual (historical). See Onyx for current policy.
Historical interest; visit Onyx or Route 66 for the closest current equivalents
Cash and cards
Price Range
Now operating as Onyx. Historical prices: beer 150-180 THB, mixed drinks 180-220 THB, entry 200-300 THB
See Onyx listing for current pricing
Hours
Closed as Slim/Fix. See Onyx for current hours.
Insider Tip
If someone recommends Slim/Fix, they are either nostalgic or using outdated information. The venue is now Onyx Nightclub. Worth visiting in its current form for the EDM and production value.
Full Review
Slim/Fix operates as a smaller, more intimate club in the Ratchada area, drawing a crowd that prefers focused music programming over the multi-room sprawl of Route 66. The room is single-purpose: a DJ booth, a dance floor, and a bar. The sound system handles the house and techno programming well, and the DJs tend toward deeper, less commercial selections than the bigger venues.
The crowd is a mix of Thai music enthusiasts and Bangkok's international club community. The smaller capacity means the room feels full earlier in the night, creating an atmosphere of intensity that larger venues take longer to build. The energy is focused and musically driven, with less of the table-service social dynamics that dominate Route 66 and Onyx.
Slim/Fix fills a niche between Ratchada's big clubs and the underground parties that pop up in warehouses and converted spaces around Bangkok. It's more accessible than the invite-only events but more musically serious than the commercial clubs. For house and techno fans visiting Bangkok, this is closer to what they're looking for.
Check the DJ schedule before going; the experience varies significantly with the booking. The crowd is knowledgeable and appreciative of good sets. Arrive around 11 PM for the transition from warm-up to peak programming.
The Neighborhood
Slim/Fix sits in the Ratchada district's club cluster, offering a more underground-leaning alternative to the large-format venues that dominate the area. It draws from Bangkok's growing electronic music community.
Getting There
MRT to Thailand Cultural Centre or Phra Ram 9 station, then a short walk or taxi. Located near the RCA complex in the Ratchada entertainment zone.
Address
RCA, Ratchadaphisek Road
Where to stay in Bangkok
Compare hotels near the nightlife districts. Free cancellation on most properties.
Other Venues in Ratchada
Onyx
Large EDM-focused nightclub on Royal City Avenue. Hosts international guest DJs and runs until early morning hours.
Route 66
Iconic RCA nightclub that has operated in various forms since the 1990s. Split into hip-hop and EDM zones with a mostly Thai university-age crowd.
Cosmic Café
Live music venue on RCA featuring Thai indie and rock bands. More relaxed than the mega-clubs, with table seating and reasonable drink prices.
Poseidon Entertainment Complex
One of Ratchada's largest soapy massage parlors with around 300 rooms. Multi-floor complex with a restaurant, karaoke lounge, and full bar.
Emmanuelle
Premium soapy massage venue on Ratchadaphisek Road with tiered pricing from 2,500 to 6,000 THB. Professional lobby and fishbowl selection system.
The Pimp
Upscale KTV and nightlife complex near Ratchada with private rooms and VIP service. Draws a Thai business crowd and occasional foreign visitors.