JBL LSR4328P 8 Inch Powered Studio Monitors

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Product Description

The 8-inch JBL LSR4328P monitors are designed to address the needs of the modern production environment. These superb-sounding studio monitors take into account the acoustic realities of your control room and optimize the sound. Using a measurement mic, these monitors can automatically calibrate themselves to the space in which they are being used. The LSR4328P monitors include an accessory kit containing a calibration microphone, remote control, LSR4300 Control Center Software (Mac/PC), USB and network cables. Sold in pairs.

JBL LSR4328P Studio Monitors Features

  • Advanced LSR Linear Spatial Reference Design provides neutral off-axis response for greater clarity at the mix position
  • Automated RMC Room Mode Correction system with calibration microphone measures and automatically compensates for low frequency standing waves and boundary conditions.
  • Harman HiQnet Network Protocol enables system-wide control of level, EQ, input selection, solo and more
  • Wireless remote control and LSR4300 Control Center Software enable control from the listening position.
  • AES/EBU, S/PDIF digital inputs
  • Balanced analog input with selectable +4dBu / -10 dBV sensitivity.
  • Bi-amplified design eliminates the need for external amplification.
  • Front panel output meter with variable brightness displays signal level.
  • Custom designed, self-shielded transducers with neodymium motor structures for exceptional transient response and superb power-handling.
  • Integrated mounting points allow wall mounting for greater placement options
  • Built-in handles facilitate optimum positioning.
  • Low and High Frequency Equalization with factory presets allows tailoring of response to preference, or acoustic conditions in the room.
JBL LSR4300 Series Studio Monitors are designed for critical stereo and multi-channel audio production applications that require exceptional spectral accuracy and high SPL capability. Acknowledging that much of today’s production is carried out in acoustically untreated rooms, the LSR4300 Series is the first professional monitor to combine JBL’s Linear Spatial Reference technology and automated RMC Room Mode Correction, an onboard system that automatically compensates for low frequency anomalies measured at the mix position. The LSR4300 enhances computer-based production by incorporating system-wide volume control, input source selection, individual speaker solo and user EQ. Harman HiQnet Network protocol enables centralized system-wide control from any speaker, wireless remote control and computer using LSR4300 Control Center Software.

438H Low Frequency Transducer
The 8-inch woofer utilizes a powerful, shielded neodymium magnet of light weight which can be used in close proximity to CRT-type monitors with no interference. The transducer utilizes a copper-clad polepiece that improves high frequency output by reducing voice coil inductance. A copper ribbon voice coil ensures high sensitivity, and a flux shorting ring stabilizes the magnetic field in the gap, reducing distortion. Heat sinking has been placed close to the magnetic gap in order to draw out heat as efficiently as possible. The cone is polymer coated for uniformity of response over the woofer's passband.

431G High Frequency Transducer
The high frequency transducer has a treated silk diaphragm that produces uniform and smooth sound. Its flat ribbon aluminum voice coil ensures low moving mass and enables the transducer to achieve response out to 22 kHz. A light weight neodymium magnet structure with integral heat sinking, along with Ferrofluid in the magnetic gap, enable the transducer to produce high peak output levels with minimal power compression. The magnet structure is integrally shielded, enabling the system to be used in proximity to CRT-type monitors with no interference.

Bi-amplified Power System
The LSR4328P incorporates two high power amplifiers that provide 150 Watts of power to the low frequency transducer and 70 Watts of power to the high frequency transducer. A precision digital dividing network having high-order Linkwitz-Riley slope characteristics for smooth transition between transducers, results in exceptional imaging and lack of time smear. The circuitry also yields a tonal-artifact-free noise floor.

Network and Digital Features
The LSR4300 Series utilizes the Harman HiQnet network protocol that allows centralized control of a multi-channel system from a from any speaker’s front panel, wireless remote control, or computer via a standard USB connection and LSR4300 Control Center Software. The network is configured using supplied CAT5 cable and by setting a DIP switch on each speaker. Harman HiQnet also enables synchronized RMC calibration of all speakers on the network.

Automated RMC Room Mode Correction System
Room modes (sometimes called standing waves) can produce a low frequency resonance that gives a misleading impression of bass response at the listening position. RMC (short for Room Mode Correction) in the LSR4300 series automatically analyzes the frequency response of the speakers at the listening position and automatically applies a corrective filter to minimize low frequency resonance. When the calibration mic is connected and the RMC analysis is initiated, the LSR4300 RMC system applies a parametric filter at any of 73 frequencies (1/24th octave centers) between 20 Hz and 160 Hz, with a variable Q from 1 (1.4 octave bandwidth) to 16 (1/11th octave bandwidth), with 3 to 12 dB of attenuation.

During the RMC calibration process, speaker levels are trimmed in 0.25 dB increments so that all speakers in the system produce equal SPL (sound pressure level) at the mix position.

See all items from JBL
Helpful Info about the Manufacturer
Phone:  844-776-4899 Warranty:  3 Years Amps and PRX700 and PRX800 Series; 2 Years Enclosures & Other

Product Specifications

Product Specifications

JBL LSR4328P Specifications


  • Frequency Response (+/- 1.5 dB): 50 Hz – 20 kHz
  • Enclosure Rensonant Frequency: 41 Hz
  • Low Frequency Extension: User controls set to default
    • -3 dB: 43 Hz – 22 kHz
    • -10 dB: 35 Hz – 32 kHz
  • Low-High Frequency Crossover: Digital Crossover: 2.2 kHz, 8th order LR LF/3rd order BW HF
  • Distortion, 96 dB SPL, 1 m: Mid-High Frequency (200 Hz - 20 kHz)
    • 2nd Harmonic: <0.4%
    • 3rd Harmonic: <0.3%
  • Low Frequency (<200 Hz):
    • 2nd Harmonic: <1.5%
    • 3rd Harmonic: <0.7%
  • Measured Maximum Continuous SPL : 106 dB / 1m
  • Measured Maximum Peak SPL: 112 dB / 1m
  • Maximum Peak SPL Per Pair: 118 dB SPL / 1m
  • Low Frequency Model: 438H
    • Diameter: 203 mm (8 in)
    • Voice Coil: 2-inch (51 mm)
    • Magnet Type: Neodymium
    • Cone Type: Polymer coated paper fiber
    • Impedance: 8 ohms
  • High Frequency Model: 431G
    • Diameter: 25 mm (1 in) diaphragm
    • Voice Coil: 1 inch (25 mm)
    • Magnet Type: Neodymium, shielded with integral heat sink
    • Diaphragm Type: Silk Dome
    • Other Features: Elliptical oblate spheroidal waveguide
    • Impedance: 4 ohms
  • Low Frequency Topology: Class A-B Monolithic, Balanced
  • Sine Wave Power Rating: 150 watts (<0.1% THD into rated impedance)
  • THD + N, _ Power: <0.02%
  • High Frequency Topology: Class A-B Monolithic
  • Sine Wave Power Rating: 70 watts (<0.1% THD into rated impedance)
  • THD + N, _ Power: <0.02%
  • AC Input Voltage: 115 VAC, 60 Hz
  • AC Input Connector: IEC
  • Self-Generated Noise Level: <13 dBA / 1 m tonal artifact-free noise floor using analog input
  • 1/8th Power Rating: 18 watts LSR4326P
  • Full Power Rating (100 hrs. pink noise, 6dB crest Factor): IEC 58 watts IEC Pink Noise LF Channel Only
  • Wattage Rating: AC at 1/8th power IEC Pink Noise 60 watts
  • Maximum Current: AC at maximum power output (audio); 120V AC line 2.2A
  • Fuse Value: 5A, 250VAC, Time Lag
Inputs and Outputs
  • XLR IN: Selectable +4 dBu/-10 dBV; Input Impedance 10K. Positive voltage applied to XLR pin 2 produces outward woofer motion
  • 1/4-in tip-ring-sleeve IN: Balanced or unbalanced, Selectable +4 dBu/-10 dBV; Input impedance 20K. Positive voltage applied to 1/4-inch tip produces outward woofer motion
  • AD Converters: 96kHz, 24 Bit, 64x Over sampling
  • Calibrated Input Sensitivity, Analog XLR & 1/4-inch:
    • +4 dBu: 94 dB SPL / 1 m
    • -10 dBV: 94 dB SPL / 1 m
  • XLR IN: AES/EBU(IEC60958)
  • XLR OUT: AES/EBU(IEC60958)
  • RCA IN: S/PDIF , (EIAJ CP1201)
  • Digital Input Sample Rates: 96k Hz, 88.2 kHz, 48 kHz, 44.1 kHz, 32 kHz. Tolerance: +/- 3%
  • Digital Input Word Length: 24 Bit
  • RMC Microphone Input (Use supplied microphone only): 1/8-inch tip-ring-sleeve; powered +15 Volts on tip.
  • Network Connection: RJ45 IN, RJ45 OUT
  • Network Protocol: Proprietary Harman HiQNet Protocol using RS485
  • Computer Interface: USB Type 1
User Controls
  • Front Panel Controls: ON, SOLO, RMC, EQ ON, LF, HF, PRESET, INPUT, +/-
  • RMC Functions: Start, Bypass
  • RMC Filter Range: 73 Frequencies (1/24th octave centers) between 20 Hz to 160 Hz, with a variable Q from 1 (1.4 octave bandwidth) to 16 (1/11th octave bandwidth, and from 3 to 12 dB of attenuation.
  • LF EQ: Factory Default: 500 Hz Shelf, +/- 2dB in _ dB increments. 137 corner frequencies between 19.7 Hz and 1kHz accessible via LSR4300 Control Center Software
  • HF EQ: Factory Default: 2kHz Shelf , +/- 2dB in _ dB increments 104 corner frequencies between 1kHz and 20.2 kHz accessible via LSR4300 Control Center Software
  • PRESET: 1-6 Factory/User plus NULL. Recall only. STORE possible using LSR4300 Control Center Software.
  • INPUT Selection:
    • Analog (XLR, 1/4-inch)
    • S/PDIF A, B
    • AES/EBU A,B
  • +/-: Default: System Volume Control: 0 dB to -oo dB
    • Secondary functions: Increment/decrement value of selected function
  • Rear Panel Controls: Input sensitivity +4dBu/ -10dBV
    • Eight SPEAKER ID DIP switches: Left, Right, Center, Left Surround, Right Surround, Center Surround, Left Extra, Right Extra
  • Additional Controls via LSR4300 Control Center Software: DIM (-12 dB at full volume), System MUTE, Preset STORE; LOAD Configuration, SAVE Configuration; Level TRIM +3 dB to – 10 db in .25 dB increments
  • Front Panel Display: 31 LED Segments for dBFS and indication of settings
  • Front Panel Meter: -70 dBFS to 0 dBFS plus CLIP
  • Rear Panel Indicators: 5 LEDs indicate active input & digital stream selection
  • Finish: Dark graphite
  • Handles: Two, flush mounted on sides
  • Mounting: 4 threaded mounting points conforming to industry standard square pattern, 107.9 mm x 50.8 mm (4.25 x 2 inches ) center to center. M6 metric threads. Not for Suspension! Only placement on bracket
  • Low Frequency Vent: Rear ported linear dynamics aperture
  • Baffle Construction: Injection-molded structural ABS Enclosure Construction: 19 mm (.75-in) MDF
  • Net Weight: 15 kg (32.5 lbs)
  • Dimensions (WxHxD): 267 mm x 438 mm x 269 mm (10.5 x 17.25 x 10.6 inches)
All measurements unless otherwise stated made anechoically in a 4tt environment at 2 meters, referenced to 1meter by inverse square law.

The reference measurement microphone position is located perpendicular to the centerline of the low and high frequency transducers at the point 63.5 mm (2.5 in) below the center of the high frequency diaphragm.

Acoustic loading provided by the listening room increases maximum SPL capability and low frequency bass extension as compared to stated anechoic values.

Distortion measurements performed with the input voltage necessary to produce the stated A- weighted SPL at the stated measurement distance. Distortion figures refer to the maximum distortion measured in any 1/10th octave wide band in the stated frequency range.

JBL continually engages in research related to performance improvements. New materials, pro-duction methods, and design refinements are introduced into existing products without notice as a routine expression of that philosophy. For this reason, any current JBL product may differ in some respect from its published description, but will always equal or exceed the original design specification unless otherwise stated. bracket. Before selecting a mounting bracket, be certain that it is capable of supporting the weight of the speaker to be mounted. This product is not designed to be suspended using mounting points.

  • Wireless Remote Control
  • LSR4300 Control Center Software
  • RMC Calibration Microphone & Mic Clip
  • USB Cable, two AA Batteries
  • 2 Network Termination Plugs

Customer Reviews

Kevin Steele Submitted: 6/23/2015
Product Rating
These are da boob!
Product Rating
What is your opinion of this product?
I'm just getting started with these JBL's and I'm so happy I got this pair, this model. I read the reviews, even the negative ones and once again I'm Happy!
Darren "Bigg" Jones Submitted: 12/10/2014
Product Rating
High-Fidelity Audio Representation & Sonic Clarity
What is your opinion of this product?
After mixing records on Yamaha and Dynaudio studio monitors for such a long time, I'd forgotten just how programmed I had become to the sound they reproduced. But here lately I've been doing a lot of audio post-production for film and first encountered these speakers at a post facility while preparing to start a new gig. The sound from these monitors blew me away from the word "Go!" And to top matters off, I had the esteemed pleasure of listening to these babies in Dolby 5.1 Surround. I knew then I had to have a pair for myself. I generally don't stray too far from products that I know very well, however, I knew what they would bring to the table for me as a mix/mastering engineer. Needless to say, they have started to deliver since day 1 of being incorporated into my setup. Now I have a tool in assisting me with meticulous mix decisions.
Jet Crawford from Hong Kong, Submitted: 4/25/2013
Product Rating
Front panel surface goes tacky
Jamland Studio from Wilmington, Delaware Submitted: 6/1/2011
Product Rating

Sounds good to me.
Yes. I expect them to last for the next two decades.
The room anylizing feature is what sold me. The process if quick and easy and the results can be viewed via the included software which can be downloaded. The included disc was out of date.
Set up was easy. The speakers connect together via CAT5. Plenty of I/O in the back. Controls are easy to use on the front. Remote control is awsome.
High quality.
Only had them a month. So far so good.
Your general opinion of this product.
They sound great overall throughout the spectrum.If you didn't have the sub, you might not miss the lows, but I will be getting the sub for that as well as the added advatage of using the crossover settings. They're also nice looking.
Rick Cat Submitted: 3/3/2011
Product Rating

Made like a tank.
The sound, the tone and RMC feature. It has everything. You can't add anything else.
So far so good
Your general opinion of this product.
You cannot beat this type of perfomance vs. price.
Gerald from New Jersey Submitted: 9/22/2009
Product Rating

JBL...Say What????
The best
Nice room control feature for home studio and professional users
Very easy to setup right out the box
Very flat and smooth response across all frequency. Very excellent at low volumes and high
Very reliable...If JBL says it does something, it does it
Your general opinion of this product.
Terrence from Phillipsburg, NJ Submitted: 9/9/2009
Product Rating

Very big and sturdy.
I like the option to switch between analog and digital inputs to compare the sound quality. Plus the room correction is a definite plus for home studio users.
Very easy setup
Very good sound. When I first turned them on they greeted me with a beautiful flat clean sound that made my body quiver.
They are JBL, what can I say!!!
Your general opinion of this product.
Excellent sound. It has a very clear and crisp sound. These have to be the new industry standard...Yamaha NS10 move over!!!
DJ Lugo Rosado Submitted: 7/28/2009
Product Rating

I love the feature of the power/functions networked together and the RMC Room Control Correction
The manual comes with a QuickStart section that will get your gear up and running as soon as you receive it.
The sound quality is very good for the price.
Your general opinion of this product.
AMS Customer from USA Submitted: 2/5/2008
Product Rating

A new true believer
Your general opinion of this product.

I rate these monitors at 5 all the way.very dependable,found no problems.I believe and hope they will last when my sons get into recording.found no worst quality with them.

I also give this a 5.The best features would be the remote control and the room mode tuning kit. theres really nothing more you can ask for.

I rate this at 5. when i open and set up my speakers i was already testing my studio within a matter of minutes.I just glanced at the manual and i instantly knew just by looking at the pics.

I rated this at 5. I believe jbl short themselves.when I first heard them ,i was amazed at how they sound.compared to the behringers they praise so much. Nothing compares out there.

I rate this at 5 all the way. I can't even begin to explain how they sound untill you have heard them yourself, believe me they are that good period. I use them with my roland 2400


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