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Also replaces the 037Ti and 052Ti. The instructions and Youtube video made things very easy to follow. I now have a fully functional 2002 Toyota Avalon subwoofer! No more sound only in the front, now I can enjoy the whole JBL experience! Sep 11, 2014 JBL L20T loudspeakers.A consumer version of their 4406 studio monitor. Another classic loudspeaker by JBL that has stood the test of time. Having some great nearfield speakers in the studio are a must but I find myself going to these wonderful speakers to evaluate their opinion of my mix, time after time. Following the success of JBL’s L Series from 1970s, JBL decided to release another L Series in the mid-80s. As previously, the whole series was a domestic version of JBL’s studio monitors from that era, and included the following models: L20T, L60T, L80T and L100T. JBL L20T through L100T Speaker Brochure. JBL L20T, L60T, L80T, & L100T Speaker Brochure. JBL L20T to L100T Brochure: File Size: 3487 kb: File Type: pdf: Download File. Powered by Create your own unique website with customizable templates. Back in the day audio nerds (like me) knew the L100 was the consumer version of JBL's sought after 4311 pro studio monitors. The L100 epitomized 1970s West Coast sound, and once you heard an L100.

1. Jbl L20t Through L100t Speaker Brochureendzone Home Theater
2. Jbl L20t Through L100t Speaker Brochureendzone Wireless Bluetooth
3. Jbl L20t Through L100t Speaker Brochureendzone Car Audio
4. Jbl L20t Through L100t Speaker Brochureendzone Speaker

James B. Lansing founded JBL one year after leaving Altec Lansing as their Vice President of Engineering in 1945. The company was first called Lansing Sound, Inc., from 1 October 1946, and later changed its name to James B. Lansing Sound. The first products were the model D101 15-inch loudspeaker and the model D175 high-frequency driver. The D175 remained in the JBL catalog through the 1970s. Both of these were near-copies of Altec Lansing products. The first original product was the D130, a 15-inch transducer for which a variant would remain in production for the next 55 years. The D130 featured a four-inch flat ribbon wire voice coil and Alnico V magnet. Two other products were the 12-inch D131 and the 8-inch D208 cone drivers.

A key to JBL’s early development was Lansing’s close business relationship with its primary supplier of Alnico V magnetic material, Robert Arnold of Arnold Engineering. Arnold Engineering extended favorable terms and deep credit to Lansing. Robert Arnold saw JBL as an opportunity to sell Alnico V magnetic material into a new market.

James Lansing was noted as an innovative engineer, but a poor businessman. For the next three years Lansing struggled to pay invoices and ship product. As a result of deteriorating business conditions and personal issues, he committed suicide on September 4, 1949. The company then passed into the hands of Bill Thomas, JBL’s then vice-president. Lansing had taken out a $10,000 life insurance policy, naming the company as the beneficiary, a decision that allowed Thomas to continue the company after Lansing’s death.

Early products included the model 375 high-frequency driver and the 075 UHF (Ultra High Frequency) ring-radiator driver. The ring-radiator drivers are also known as “JBL bullets” because of their distinctive shape. The 375 was a re-invention of the Western Electric 594 driver but with an Alnico V magnet and a four-inch voice coil. The 375 shared the same basic magnet structure as the D-130 woofer. JBL engineers Ed May and Bart N. Locanthi created these designs.

Two products from that era, the Hartsfield and the Paragon, continue to be highly desired on the collectors’ market.

In 1955 the brand name JBL was introduced to resolve ongoing disputes with Altec Lansing Corporation. The company name “James B. Lansing Sound, Incorporated” was retained, but the logo name was changed to JBL with its distinctive exclamation point logo.

The JBL 4320 series studio monitor was introduced through Capitol Records in Hollywood and became the standard monitor worldwide for its parent company, EMI. JBL’s introduction to rock and roll music came via the adoption of the D130 loudspeaker by Leo Fender’s Fender Guitar company as the ideal driver for electric guitars.

In 1969, Bill Thomas sold JBL to the Jervis Corporation (later renamed Harman International) headed by Dr. Sidney Harman. The 1970s saw JBL become a household brand, starting with the famous L-100, which was the best-selling loudspeaker model of any company to that time. The 1970s also saw a major JBL expansion in the professional audio field from their studio monitors. By 1977, more recording studios were using JBL monitors than all other brands combined, according to a Billboard survey. The JBL L-100 and 4310 control monitors were noteworthy, popular home speakers. In the late 1970s, the new L-series designs L15, L26, L46, L56, L86, L96, L112, L150, and later the L150A and flagship L250 were introduced with improved crossovers, ceramic magnet woofers, updated midrange drivers, and aluminum-deposition phenolic resin tweeters. In the mid 1980s the designs were again updated and redesigned with a new titanium-deposition tweeter diaphragm. The new L-series designations being the L20T, L40T, L60T, L80T, L100T, the Ti-series 18Ti, 120Ti, 240Ti, and the flagship 250Ti. To test speaker drivers, JBL in Glendale and Northridge used the roof as an outdoor equivalent to an anechoic chamber.

JBL Loudspeaker Systems

Jbl L20t Through L100t Speaker Brochureendzone Home Theater

JBL Pro Loudpseakers

• 43 Series
• LSR Series

JBL Consumer Loudspeakers

• Century L Series
• Century II L Series

My Story

I was searching for a small set of speakers for my bedroom and came across these monitors. A quick internet search revealed mostly positive opinions and because I really enjoyed listening to JBL L26 and L100, I thought I would give JBL L20T a go. The speakers, apart from a couple of scuffs here and there, turned out to be in very good condition.
Please note – usually before reviewing vintage speakers, I recap the crossovers to ensure that capacitors are within manufacturer’s specification. On this occasion, caps were within spec from the original schematics, so there was no need for a recap.

Jbl L20t Through L100t Speaker Brochureendzone Wireless Bluetooth

Speaker Info

Following the success of JBL’s L Series from 1970s, JBL decided to release another L Series in the mid-80s. As previously, the whole series was a domestic version of JBL’s studio monitors from that era, and included the following models: L20T, L60T, L80T and L100T. The studio equivalent of the reviewed speakers were the JBL 4406 – nearfield studio monitors. The JBL L20T’s were a compact two way bookshelf speaker, that according to JBL, are supposed to offer extended frequency response, great dynamic range and reproduction of the full sound stage. They feature JBL’s acclaimed titanium high frequency transducer, O35Ti, which allows them to go way above the audible frequency range. Considering their size, they offer extremely high power handling, which combined with their average sensitivity of 87dB, means that they can be played very loud.

JBL L20T Specs

Look & Feel of JBL L20T Speakers

The finishing quality is very good. The enclosures are made of chipboard, finished in a real wood veneer and dampened with open cell foam. Quite rigid and relatively heavy considering the size.
The drivers are very neat and remind me a bit of the units from Yamaha NS-1000s – very industrial and solid. The tweeters feature domes made of titanium, whereas the bass drivers feature cones made of polypropylene, suspended on rubber surrounds. These are driven by relatively hefty ferrite magnets, mounted on the back of rigid cast alloy baskets. The crossovers are pretty standard and feature decent components (in comparison to JBL crossover’s from the 70s).

Sound of JBL L20T

Having experienced and being impressed by older JBL monitors, I had really great hopes for these little bookshelf speakers. When I plugged them in for the first time, they very much reminded me of my laptop speakers (i.e. raising frequency from 500Hz to 10kHz). It felt as if something was missing in the midrange, which made them sound a little bright. I was hoping that this feeling will go away as I spend more time listening to the speakers. Unfortunately, regardless of how many attempts I made, it did not go away, and I constantly felt a lack of something.
Because of this, my perception is that midrange and treble are not well balanced. Clapping sounds more like rain and I do not enjoy the saxophones. Furthermore, the speakers give an impression of a relatively small sound stage – this is especially noticeable, when I compare them directly with my Yamaha NS-1000. When I switch from Yamaha’s to JBLs, everything becomes smaller and shallower (of course the distance between the speakers was the same for the two sets). This means that instead of creating an illusion that I am at a concert, they just make me feel like I listen to a set of speakers. The vocals and guitars tend to sound ok, but nothing to write home about.
Bass-wise, they go quite low for the size, however, because of the amount of treble they generate in relation to bass, they sound quite thin. This is very noticeable on recordings with pianos and double bass. Drums sound quite dynamic, but not the most realistic.
Overall, and despite trying very hard, I struggled to find anything that I would like about these speakers. Which is interesting, as I have seen plenty of positive comments on various forums. It clearly shows, how subjective our sound perception is…

Conclusion

Jbl L20t Through L100t Speaker Brochureendzone Car Audio

The JBL L20T are not very enjoyable and not very engaging to listen. Thin and relatively cold sounding. Good attack for the size and impressive power handling.

Jbl L20t Through L100t Speaker Brochureendzone Speaker

Reviewed: November 2016 | Published: December 2016