RSL C34E In-ceiling Speaker Reviewed

Published On: September 11, 2017
Last Updated on: October 31, 2020
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RSL C34E In-ceiling Speaker Reviewed

Scott Schumer reviews RSL's C34E, a full-range in-ceiling speaker that uses dual 4.5-inch woofers and a single 0.88-inch cloth dome tweeter. This "edgeless" speaker carries an asking price of just $125 each.

RSL C34E In-ceiling Speaker Reviewed

  • Scott Schumer is an executive in the fields of consumer electronics, commercial audio, video, and IoT who has a passion for custom AV installation, smart home, affordable AV equipment, and high-performance headphones.
    He formerly served as sales, marketing and product development at Sennheiser / Neumann USA; Harman; Loud Technologies; and Blue Microphones; and is currently managing North American sales for Peavey Commercial Audio.

Rogersound Labs started building speakers in 1970. This was a time before digital downloads, before Class D amplification, and--yes-- 13 years before the Compact Disc exploded on the audio scene. This was a time when turntables ruled, and we actually listened to the entire album in the track order the artists chose to take us along with them on their musical journeys (I'm thinking Thick as a Brick, Tommy, and Fragile). Brands that populated the boutique audiophile stores (my favorite back in the day was Lyric Hi Fi on Lexington Avenue in New York City, which is still open and doing very well) and even the Hi-Fi on the highway mini-chains (Crazy Eddy and Druckers, to name two) included Thorens, Marantz, Nakamichi, Phase Linear, Revox, Sherwood, Sony, Dynaco, Technics, Sansui, Dual, Teac, Pioneer, and McIntosh. Loudspeakers were made by companies like JBL, Altec, Klipsch, Acoustic Research, KLH, Rectilinear, Advent, Boston Acoustics, and (you guessed it) RSL.

Howard Rodgers was the company's founder and president until it was sold in 1989. He subsequently re-purchased RSL in 1992 and re-launched it in 2010. RSL's products have always been about the sound first and foremost--about connecting with the customer and making great-sounding loudspeaker systems at affordable prices. I received a pair of RSL's new C34E in-ceiling speakers for review, which are just $125 each. These speakers are engineered for Dolby Atmos and DTS:X (or any home theater sound format), as well as for stereo music in a whole-home application--that is to say, they are full-range speakers suited to tackle even stereo-summed-to-mono duties in small spaces.

What's different about the C34E compared with many other in-ceiling options out there? Plenty. The adjustable-angle tweeter is horizontally centered and vertically sits slightly above the dual fixed-angle woofers. This design creates a lateral, phase-coherent driver alignment that results in natural, pleasingly even frequency delivery. This is a major advantage over designs that place the tweeter in front of the woofer, which blocks certain frequencies. The speaker uses dual 4.5-inch polypropylene woofers (each is 16-ohm, which nets an eight-ohm total impedance) and a single 0.88-inch cloth dome ferrofluid tweeter. Ferrofluid dampens the impedance at resonance to effectively lower distortion, smooth frequency response, and increase thermal power handling. The adjustable tweeter also allows greater placement flexibility, in case the optimal location has an air duct, a vent, a beam, or other issue. RSL recommends that you rotate the circular enclosure to aim the drivers toward the primary listening position. Most ceiling heights will allow for a sweet spot of more than one person.

The C34E has an onboard 6-dB/octave first-order crossover. I could write an entire article on crossovers; if you are interested, there's good information here and here. Brent Butterworth's excellent article on first-order crossovers is a must read if you want to go even deeper. Suffice it to say, RSL took the purist audio path option: no electrolytic caps, only air core coils ... which isn't inexpensive, but the results are a system with silky highs, clear midrange, and plenty of bass response.

Originally designed to be a great-sounding stereo speaker, the company quickly realized that mounting the C34E in an in-ceiling format provides a perfect full-range solution to meet the requirements of Dolby Atmos (and a superior option for DTS:X, as well).

The Hookup
The C34E's circular cut-out measures 10.13 inches with an overall 11.63-inch diameter, and the C34E has a relatively narrow depth of 3.88 inches--allowing it to be installed in ceilings with minimal depth clearance. If you have living space above the ceiling into which you will be installing these, it is recommended that you use insulation around the installation opening. Home Depot sells UltraTouch Denim insulation that is eco-friendly, fiberglass free, and doesn't break up and get into places it shouldn't ... and it works quite well to keep the sound out of the living space above. If there is just an attic above, then leave the space open to provide extended bass response. The C34E is edgeless and has a paintable, magnetic grill.


RSL sent the pair of C34Es in a ported, wood car stereo kick box-like enclosure so that I wouldn't need to cut holes in my ceiling to conduct a proper evaluation. I initially evaluated them as I would a stereo bookshelf pair, comparing them with my reference two-way bookshelf and three-way tower speakers, with and without a sub.

I also wanted to audition them as Atmos speakers. I have 16-foot ceilings in my Atmos-enabled home theater, which uses Definitive Technology's DI 6.5LCR in-wall speakers for left, center, and right duties and four DI 6.5R in-ceiling speakers for the height channels. Supplementing the Definitive speakers are side and rear surrounds from DAS and an M&K 12-inch subwoofer that I've owned for years. To substitute the RSL C34Es into the equation, I was able to rig them just below my rear height speakers, unscrew the Definitive doglegs, disconnect the speaker wire, and reconnect it to the RSLs. Later, I did the same with the mid-height channels and played the same content again in all-stereo mode to see how they performed as a whole-home audio solution.

So, how did they perform? Read on.

To describe how the C34Es handled Dolby Atmos height information, I'll start with Patriots Day. Sure, there are explosions and gunfire (both automatic rifles and pistols), which the RSLs handled just fine. However, they shined in the quiet parts where the height channels were only asked to support the incidental music and tension-creating effects. The localization and spaciousness were amazing. True to the Atmos promise, the experience was highly immersive.

Patriots Day Official Trailer #1 (2017) Mark Wahlberg, Kevin Bacon Drama Movie HD

With Rogue One, the sonic impact was impressive, with the added qualities of smoothly handling the low rumbles without muddying up the dialogue and high-frequency laser blasts, which can cause sonic trouble for lesser speakers. Switching between three adjacent listening positions I was unable to tell where the speakers were as the Dolby Atmos processor smoothly moved sonic objects all around me with no off-axis coloration. The benefit of height speakers is the added dimension many refer to as an enveloping sphere rather than the pre-Atmos, pre-DTS:X surround on a flat plane soundstage. At 1:05, the soft dialogue between Governor Tarkin and Galen Erso is front and center while rain effects fall from the sky and a minute later the Alliance fighters attack ... laser blasts ensue! This is a great test of your system's ability to put you in the middle of the action.

Rogue One: A Star Wars Story Trailer (Official)

Arrival has lots of ethereal musical pads and washes, along with dynamic dialogue ranging from whispers to shouts, and the C34Es were absolutely up to the task. Helicopter sounds begin around the 14:30 mark. At 15:20 there is one that comes right at you, then you are in the copter's cabin on a headset listening to a three-person conversation. Tense, Theremin-type background music begins before your copter lands as others take off and fly around. This lasts until 20:40--over six minutes of helicopters has to be a feature film release record! And what an opportunity to show off your system's ability (or lack thereof) to reproduce the director's intent. With RSL's C34E in-ceiling speakers providing the height information, my system shined.

Arrival Official Trailer 1 (2016) - Amy Adams Movie

With music, the C34Es sounded lush and sparkly, with no noticeable harshness and more thump than I expected from an in-ceiling speaker. Yes, in All-Stereo mode, listening to these tracks, the C34Es brought a smile to my face.

Paul Weller's "Broken Stones" from the album Stanley Road (Go! Discs) is a great mix with lots of "air" between the vocals and backing track. The reverb trail on Weller's lead vocal is placed all the way in the right channel, while the Fender Rhodes keyboard flanges right and left. Forget all that and just let the music take you wherever you want to go. It's magic!

Paul Weller - Broken Stones (Official Video)

Pink Floyd's "Breathe" from Dark Side of the Moon (Harvest Records) is a track most are familiar with, and I include it for that reason and others. The very familiarity we may have with a song makes re-discovering it all the more powerful when something new is revealed. Using full-range speakers at every position when listening in all-stereo mode is perhaps one of the biggest differences you can make in your home theater and throughout your house if you are creating a whole-home audio system. As you walk around, your stereo orientation will change but your enjoyment will not! I'm glad the Atmos spec of full-range speakers everywhere yields a significant benefit even when you're not using their processing to watch a movie. With this track, the C34Es' performance was simply awesome.

Pink Floyd - Breathe

The Weeknd's "Starboy" from the album Starboy (XO and Republic Records) has LOTS of bottom end and "interesting" effects. The Toronto singer uses staccato punctuation on his lead vocal track against the throbbing dark techno beats inspired by Daft Punk's collaboration. This is one of my new favorite system demo tracks, and the C34E did a great job delivering the complete presentation.

The Weeknd - Starboy ft. Daft Punk (Official Video)

The Downside
The C34E requires kind of a big hole to be cut in your ceiling, but the speaker really does vanish if done right. I think the extra effort to install in-ceiling speakers is worth it for Atmos, as I much prefer in-ceiling height speakers to the Atmos-enabled "bounce" approach.

The C34E is an open-back design; there's no back box, which allows for more sound leakage into other rooms. If you have a living space above your theater room and want to control how the sound propagates, you may prefer a ceiling speaker with a back box--something like Monitor Audio's Controlled Performance Range. You can always buy or build your own back box or just use the denim insulation I mentioned earlier--but you won't get the quality-control aspect that you get when the back box is part of the design.

Comparison and Competition
Definitive Technology's DI 6.5R is $279 each, which makes it more than twice as expensive. I found the RSLs to have a little more bass response and to be capable of more impact, which I wouldn't have thought I needed (wanted?) from Atmos height speakers until I heard these.

Another choice is the Klipsch CDT-5800-C II. It's $399, so we are once again talking about a speaker that's more than three times the price of the RSL C34E. Klipsch also sells Atmos-enabled up-firing speakers that are $499/pair for the RP-140SA or $399/pair for the smaller footprint R-14SA.

The $125 Polk Audio MC60 is roughly the same price as the RSL. However, in my opinion, it's a utilitarian in-ceiling speaker that sounds okay ... but just okay. Even the Polk website does not indicate that it is meant for critical listening or full-range Atmos or DTS:X applications. Polk does make excellent in-ceiling speakers that would do very well indeed in those applications, but they are double or triple the price. This just points out how much value you are getting with the RSLs at the $125 price point.

The ear can detect not only right/left information, but height as well. Your brain uses both your ears to locate a threat that can't immediately be seen by measuring all sorts of sonic attributes very quickly. From Wikipedia: "The Haas effect or the Precedence Effect is a Psychoacoustic Effect described by Helmut Haas as the ability of our ears to localize sounds coming from anywhere around us." As we seek to make the theater experience reflect this sonic immersion, technologies like Dolby Atmos and DTS:X emerge along with their attendant product and system requirements. Prior to Atmos, we got into the habit of using "lesser" speakers for rear and side surrounds. Now we need to rethink this and go with quality full-range speakers in every position. And quality full-range sound is exactly what the RSL C34E delivers.

From my experience, for ceilings lower than nine feet, in-ceiling speakers become too directional, which somewhat diminishes the intent and indeed the capabilities of Dolby Atmos and DTS: X. In these instances, my recommendation would be to use Atmos-enabled speakers that bounce the height audio information off the ceiling.

However, for taller ceilings like my 16-footers, I strongly recommend full-range in-ceiling speakers, and I can wholeheartedly recommend the RSL C34E. It would still be my choice were it much higher in price than $125.

Additional Resources
• Visit the RSL website for more product information.
RSL CG3 5.2 Home Theater Speaker System Reviewed at
New C34 Edgeless In-Ceiling Speaker From RSL at

  • David
    2022-07-21 20:26:59

    Just for music!

  • David
    2022-07-21 20:26:25

    We have 8’ ceilings

  • David
    2022-07-21 20:25:39

    Hello we have a niles zr-6 system and our looking for ceiling speakers, what would you recommend?

  • Skribbl
    2022-01-01 16:44:48 game is an online drawing and word guessing game also free. The game consists of several rounds where each round has to draw the chosen word, and other players in the game have to guess the word to score points.

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