Loft 40

Artikel# LOFT 40
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Additional Information
We designed the JBL® Loft Series for both sound and style, and the Loft40 two-way bookshelf speakers deliver. Capable of handling 125 watts, each Loft40 features a 5-1/4-inch (133-millimeter) PolyBass woofer for clear, powerful bass and a 1-inch (25-millimeter) soft dome tweeter with our proprietary Elliptical Oblate Spheroidal™ (EOS) waveguide, which evenly distributes sound throughout space. Our Straight-Line Signal Path™ (SSP) design ensures that audio signals reach the drivers in high fidelity. Just as impressive as the speakers’ technology is their slim, elegant appearance, designed for audiophiles who want audio components to look as beautiful as they sound.
At a Glance:
  • 10 – 125 watts suggested amplifier range
  • 5-1/4" (133mm) PolyBass woofer
  • 1" (25mm) soft dome tweeter with EOS waveguide
  • FreeFlow port technology
  • Straight-Line Signal Path (SSP) design
  • Accurate frequency response
What's in the Box:
  • 2 JBL Loft40 5-1/4" (133mm) bookshelf speakers
  • Owner’s manual
For those audiophiles who yearn for speakers with great looks as well as great sound, we’ve designed the JBL® Loft Series. These speakers are slim, elegant audio components that range from compact bookshelf to robust tower speakers. One remarkably versatile set in the line is the Loft40. It’s a pair of thin bookshelf speakers that offer listeners a great option for setting up a two-channel stereo or multichannel surround-sound system. Each speaker in the set features a 5-1/4-inch (133-millimeter) PolyBass woofer with FreeFlow port technology for big, clear and extended bass, and a 1-inch (25-millimeter) soft dome tweeter that can reach frequencies as high as 20kHz. Each speaker’s tweeter features our proprietary Elliptical Oblate Spheroidal™ (EOS) waveguide, which evenly distributes sound throughout your listening space and makes every seat the best seat in the house. The Loft40 speakers handle up to 125 watts and use a Straight-Line Signal Path™ (SSP) design to help ensure that a strong, precise signal arrives at each driver with little alteration from its original source. And the speakers are beautiful to see, too. All in all, the Loft40s’ breathtaking sound will impress you as much as their stunning looks.
Product Features:
  • 10 – 125 watts suggested amplifier range
    JBL engineers designed the Loft40 bookshelf speakers to produce precise, exceptional sound from a receiver or amplifier capable of delivering up to 125 watts.
  • 5-1/4" (133mm) PolyBass woofer
    Paper produces the most natural sound of all driver materials. We’ve reinforced the Loft40’s paper woofer cones with a proprietary polymer that provides additional stiffness and damping to the cone surface. These qualities provide the listener with tight bass and extended low frequencies without breakup or distortion.
  • 1" (25mm) soft dome tweeter with EOS waveguide
    The Loft40’s tweeter features a 1-inch (25-millimeter) soft dome with high sensitivity and fast transient response for accurate high-frequency reproduction. The tweeter integrates with an EOS (Elliptical Oblate Spheroidal) waveguide, giving high-frequency sounds a wide, consistent listening window. The result is an incredibly broad stereo image across a huge listening area.
  • FreeFlow port technology
    A rear-firing FreeFlow™ port is acoustically matched to the Loft40’s woofer to move air out of the speaker’s cabinet. You’ll get extended bass response with low distortion, adding power to your music and excitement to your movie soundtracks.
  • Straight-Line Signal Path (SSP) design
    The ideal path from input to components to transducers is a straight line. The Loft40 takes that path. Its Straight-Line Signal Path (SSP) technology preserves the clarity, detail and dynamics of your favorite audio content.
  • Accurate frequency response
    The Loft40 doesn’t over-emphasize or under-emphasize any sounds. With a frequency response of 55Hz ? 20kHz, it reproduces a true, full sound range from deep bass tones to ultrahigh frequencies.
Manuals & Downloads:
Algemene specificaties:
Low Frequency Transducers
Two 100mm (4") PolyPlas cones, magnetically shielded
High Frequency Transducer
25mm (1" ) soft dome on EOS waveguide, magnetically shielded
Power Handling
10 – 150 watts
Audio Specifications:
Nominal Impedance
8 Ohm
(2.83V/1m) 90 dB
Frequency Response
Power Handling (Recommended)
10-125 watts
Sensitivity (2.83V/1m)
Speaker Specifications:
High-Frequncy Transducer
25mm (1") soft dome on EOS waveguide
Low-Frequency Transducer
130mm (5-1/4") PolyPlas cone
Afmetingen / Gewicht:
Height (mm)
Width (in)
Weight (kg)
Weight (lb)
Height (in)
Depth (in)
Width (mm)
Depth (mm)
Control and Connection Specifications:
Connector Type
Binding post
Loft 40 heeft als beoordeling 4.7 van de 5 door 11.
Rated 5 van de 5 door uit Great sound from a small enclosure. I bought these months ago on a great JBL promotion as the style is similar to the famed BBC monitors such as the LS3/5a and I am not disappointed at all. The clarity is superb and if you need more bass, JBL has plenty of subs to go with these. I use these in my math class to teach some basics of digital audio and why my students should care more about math as they are listening to ones and zeros now...quite a shock to most of them, and how important math should be to them. I have some band students in my classes, I record them and show them the wave forms to bring some meaning to the marriage of math and music.
Datum plaatsing: 2016-01-04
Rated 5 van de 5 door uit Excellent Small Size Bookshelf Speakers I bought a set of Loft 40 Bookshelf Speakers to try because I liked the Loft 30 Bookshelf Speakers so much. They sound pretty closely matched sensitivity wise to the Loft 30's, but the Loft 40's have a little bit lower bass output. I use them on a Yamaha - R-S201, 100W.P.C. 2 Channel Stereo Receiver fed threw an old Optimus - 10 Band Stereo Equalizer & they can take some volume. I put about 85 watts to them at the most so far, after I broke them in for a good 20 hours ruffly at moderate volume & they played nice & clean without cone break-up or distortion with every type of music I threw at them. The tweeters on the Loft series speakers are what I like most about them. The tweeters never get to overly sharp or bright compared to the woofers & are crossed over at about 4200KHz compared to the Loft 30's that are crossed over low at about 1750KHz. These are excellent small bookshelf speakers & I am glad that I bought a set of the Loft 40 Bookshelf Speakers after buying a set of the Loft 30 Bookshelf Speakers. I recommend the Loft 40 Bookshelf Speaker to anyone, these little guys are so worth every penny! You can't go wrong with JBL speakers & the world class audio quality they have always provide us for all these years.
Datum plaatsing: 2016-05-08
Rated 5 van de 5 door uit Terrific sound, an in an amazingly small package. I purchased these speakers to fit on my bookshelves in my bedroom so I'd have some and be able to move the very large speakers I had in there to the den. Being familiar with JBL products over the decades I trusted that they would sound great, but I was surprised at how wonderful these little babies performed. They are clean, accurate, and reproduce music without much coloration and they create a realistic and rewarding sound stage. Better then I had hoped for. I'm considering a small sub to round out the low end but for now I'm quite pleased with how well these speakers are performing.
Datum plaatsing: 2016-01-04
Rated 5 van de 5 door uit High speaker review Purchased them four months ago. They performed better than expected, producing clear sound and adequate bass.
Datum plaatsing: 2016-01-05
Rated 5 van de 5 door uit bookshelf speakers I bought these about 4 months ago they were bought to put in my garage and i am really happy i did big improvement over what i had my sons are enjoying them also while they workout nice sound to them thanks JBL I need a better sound system to use the full potential
Datum plaatsing: 2015-12-19
Rated 5 van de 5 door uit small but powerfull speakers Great Speakers, small size with a powerful sound. I have these speakers installed in my computer. [This review was collected as part of a promotion.]
Datum plaatsing: 2017-05-16
Rated 5 van de 5 door uit Great price and service I have had the Loft 40 speakers for about 2 months now and have been very happy with them. I am using them as rear surround speakers for my 7.1 channel home entertainment system and they fill that position very well. I only wish I had ordered 1 more set at that price for surround side speakers. My speakers are now all JBL and I love them all!!
Datum plaatsing: 2016-01-04
Rated 4 van de 5 door uit Good price with quality I have two set of JBL speakers, the other one is ES80 which I enjoy a lot while playing classic music. Using one of Loft40 as center speaker. Overall very satisfied with Loft40 but it's a bit bigger than I expected. The height is 10" and width is 6.5". For small room is good price and quality.
Datum plaatsing: 2015-12-20
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Can music be played in these speakers through and AUX port with my phone?

Gevraagd door: Lsod
Unfortunately, the speakers do not have an AUX port, so you won't be able to use/connect it via an AUX cable to your mobile device.
Beantwoord door: Amir at Customer Service
Datum plaatsing: 2017-12-02

Can you recommend a make and model of wall hanging brackets (swivel preferred) that will support the Loft 40's?

Gevraagd door: GeorgioP
Unfortunately we cannot offer any one particular bracket, but typically speaking we always like the brackets that Omni-Mount make. Please check them out at www.omnimount.com. I'm sure they will have brackets that will work on the LOFT 40 speakers.
Beantwoord door: Joe At Customer Service
Datum plaatsing: 2017-12-02

what are the overall dimensions? HxWxD

Gevraagd door: MW9397
Height: 10" Width: 6-1/2" Depth: 7-1/2"
Beantwoord door: Joe At Customer Service
Datum plaatsing: 2017-12-02

Hi, What is the impedance? Can I connect 6 ohm surround loudspeaker to a 8 ohm amp? What is the penalty? Tnx

Gevraagd door: Rondor
The LOFT 40 speakers are 8 ohms. If your receiver can handle an 8 ohm load, most can, you will not have any issues using these speakers. As for 6 ohm speakers. If your receiver cannot handle a 6 ohm load, and you use 6 ohm speakers, it is possible to blow the amplifier. It is not recommended.
Beantwoord door: Joe At Customer Service
Datum plaatsing: 2017-12-02

Have (2) 100 watt RMS Sony STR-DH130 Stereo Receiver Amp, have purchased 4 pairs of the Loft 40's to use and need to know recommended "break in" or "run in" please. Have Googled to research but would prefer info from THE mfg...Thank You. Bill Campbell

Gevraagd door: gitarman58
There is no "burn in" period required for our speakers. You can run them right from the beginning, right out of the box, and you will not cause any damage at all. In the meantime, yes it is true that the sound will change ever so slightly as the speakers "burn in" during the first 10-20 hours of listening, but there is no harm in cranking them up right from the beginning.
Beantwoord door: Joe At Customer Service
Datum plaatsing: 2017-12-02

what gauge speaker wire is best to connect these speakers?

Gevraagd door: joebaby
Hello, Thank you for your inquiry. Here is the information you requested. Best Regards. Loudspeaker wire throughout the system should be good quality, loudspeaker grade audio cable with polarity coding. For loudspeaker wire that runs less than 25 feet, the cable should be a minimum of 18 AWG, for loudspeaker wire that runs up to 50 feet, the cable should be 16 AWG and for loudspeaker wire that runs longer than 50 feet, the cable should be at least 14 AWG.
Beantwoord door: Zoltan
Datum plaatsing: 2017-12-02
  • y_2018, m_12, d_10, h_20CST
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