JBL L300 Summit Speakers Pair – Restored – 1-Year Warranty

$14,999

-

  • JBL L300 Summit 3-way floorstanding loudspeaker pair
  • 15-inch JBL 136A woofer, LE85 compression driver on H92 horn / L92 lens, 077 ring-radiator tweeter
  • Acoustic design derived from the JBL 4333 studio monitor
  • 8-ohm nominal impedance, 150 W continuous program, crossovers at 800 Hz / 8.5 kHz
  • Walnut cabinets with blue grilles
  • All original drivers – cones and diaphragms in good condition
  • Every driver checked, crossover capacitors checked, RTA-verified frequency response and phase
  • Backed by our 1-Year HQaudios Warranty

1 in stock

Make offer Buy Now
SKU: 12LC0039 - VS24 Categories: ,
SOUND DEMO / AUDIO EXPERIENCE

Sound Demo

For the best audio experience, please use headphones or external speakers.

JBL L300 Summit 3-Way Speakers – 15-Inch Woofer – Pair
Professionally Restored by HQaudios – Inspected & Tested – Backed by Our 1-Year Warranty

KEY HIGHLIGHTS
JBL L300 Summit 3-way floorstanding loudspeaker pair
15-inch JBL 136A woofer, LE85 compression driver on H92 horn / L92 lens, 077 ring-radiator tweeter
Acoustic design derived from the JBL 4333 studio monitor
8-ohm nominal impedance, 150 W continuous program, crossovers at 800 Hz / 8.5 kHz
Walnut cabinets with blue grilles
All original drivers – cones and diaphragms in good condition
Every driver checked, crossover capacitors checked, RTA-verified frequency response and phase
Backed by our 1-Year HQaudios Warranty

PRODUCT OVERVIEW
The JBL L300 Summit brought the acoustic design of JBL’s 4333 studio monitor into a home loudspeaker. Its 3-way system combines a 15-inch 136A woofer, an LE85 compression driver on an H92 horn with L92 acoustic lens, and a 077 ring-radiator tweeter in a bass-reflex enclosure.
The result is full-scale bass, a direct and dynamic horn-loaded midrange and an airy top end, housed in the distinctive Summit cabinet with its slanted front baffle and walnut finish.
We restored this pair with careful attention to technical operation and cosmetic presentation, while preserving the original JBL design and voicing.


HQAUDIOS RESTORATION & TESTING

Before Restoration
This JBL L300 Summit pair was carefully inspected upon arrival to evaluate its mechanical, electrical, and cosmetic condition.
Each cabinet, cone, surround, and spider was checked for originality and for glue joints that had loosened or shifted with age. Every driver was tested by hand for voice-coil rub, and the DC resistance of every driver was checked against its nominal impedance.
The crossover networks were examined for bulging or leaking capacitors, each capacitor was measured against its original value (within 10% tolerance), and the level controls were checked for burn marks or worn contact surfaces. The inspection results were used to determine the work required for this specific pair.

During Restoration
Based on the inspection results, this JBL L300 Summit pair was restored according to HQaudios’ technical standards while preserving its original engineering and voicing.
Presence & Brilliance L-Pads: Both original Presence and Brilliance L-pad level controls were carefully removed for internal inspection. The internal wiper contacts and resistive windings were found to be in good operating condition. Each L-pad was thoroughly cleaned, with special attention given to the internal contact surfaces to ensure smooth adjustment and reliable signal continuity.
Drivers: All drivers retain their original cones and diaphragms, which are in good condition.
Identification Label: To preserve its originality, the original JBL Summit L300 identification label was carefully cleaned using a specialized solution suitable for vintage printed surfaces.
Cleaning & Detailing: All drivers, crossover boards, and terminals were cleaned, and the cabinets and grilles were cleaned and detailed.

After Restoration / Final Testing
Once restoration was completed, the pair underwent comprehensive testing under real operating conditions.
Frequency Response: Measured with an RTA (real-time analyzer) and a calibrated sound card to confirm a smooth, well-balanced response and close matching between the two speakers.
Polarity: Driver polarity was verified with a phase-reversal check so both speakers play in correct phase.
Presence & Brilliance Controls: The controls were reinstalled and tested through their full adjustment range for consistent operation without unwanted noise or signal interruption.
Listening Test: The pair underwent an extended real-world listening test with a wide range of music to confirm dynamics, tonal balance, and stereo imaging.
Final QC: A complete visual and functional quality-control inspection was completed before release.

CONDITION

Technical Condition
Drivers: All drivers operating; original cones and diaphragms in good condition
Crossovers: Capacitors checked
Presence & Brilliance L-Pads: Inspected, cleaned and tested through their full range; smooth, quiet operation
Impedance: 8 ohms nominal

Cosmetic Condition
Cabinets: Walnut cabinets with light signs of age
Front Baffles: Dark front baffles with JBL horn/lens assembly
Grilles: Blue fabric grilles
Identification Label: The original JBL Summit L300 identification label remains intact and retains approximately 80% of its original cosmetic condition. The label shows normal age-related marks but remains clean, legible, and well preserved. The original model designation, system impedance information, and factory serial number remain clearly visible.
Exterior Wear: The exterior shows light signs of wear consistent with age.
Overall Presentation: A vintage pair with light signs of age and previous use. Please review all photos for exact cosmetic details.

Every Driver Checked
Crossover Capacitors Checked
RTA & Phase Verified
Final Listening Test Completed

SPECIFICATIONS
Brand: JBL
Model: L300 Summit
Type: 3-Way Floorstanding Loudspeaker
Era: 1970s
Low-Frequency Driver: 15-inch JBL 136A
Midrange: JBL LE85 compression driver, H92 horn / L92 lens
High-Frequency Driver: JBL 077 ring radiator
Crossover Frequencies: 800 Hz / 8.5 kHz
Nominal Impedance: 8 ohms
Power Capacity: 150 W continuous program
Sensitivity: 93 dB / 1 W / 1 m
Dimensions: approx. 23 W × 31.6 H × 22.5 D in (each)
Finish: Walnut / blue grilles

WHAT IS INCLUDED
1 pair (2) JBL L300 Summit speakers
Blue front grilles shown in the photos
Only the items specifically listed above are included. Speaker stands or wood bases shown in the photos are for display only and are not included. Amplifiers, cables and other accessories are not included.

SHIPPING & PACKAGING
Your vintage audio equipment will be professionally packed by HQaudios using protective materials appropriate for its size, weight, and construction. Large or heavy items may be palletized and shipped by freight when required for safer transportation.
HQaudios Professional Shipping and Packaging
Please contact us before purchase for the most current availability information.

1-YEAR WARRANTY & CUSTOMER SUPPORT
Your purchase is backed by our 1-Year HQaudios Warranty. Our team provides support before and after your purchase. If you have questions about setup, operation, compatibility, or your order, please contact HQaudios for assistance.

MORE FROM HQAUDIOS

HQaudios Vintage Audio Repair and Restoration
HQaudios Custom Audio Projects

Reviews

There are no reviews yet.

Be the first to review “JBL L300 Summit Speakers Pair – Restored – 1-Year Warranty”

Related products

1thlc1106 - Thumb

Altec Valencia 416A 15″ Horn Speakers – PRO RESTORED – 1-Year Warranty

$3,999

-

5dqs1548

JBL L100 Century Pair of Speakers – Fully Restored & Serviced– 1Yr WRT

-

Speakers_jbl_4312xp_2qe0052_10

Excellent JBL 4312XP Studio Monitor Pair of Speakers – Fully Serviced– 1Yr WRT

$2,599

-

S-l1600 (72)

Klipsch KG4 Pair of Speakers – Fully Restored – 1-Year Warranty

$1,699

-

1tolc2427 - Thumb

Empire Cavalier 4000 Pair Of Vintage Speakers – Professionally Restored – 1-Year Warranty

$1,000

-

-14%
2qe0113_tannoy_stirling_4

Tannoy Stirling HW Vintage Speakers (Pair) – Restored – 1-Year Warranty

Original price was: $5,799.Current price is: $4,999.

-

Jbl_l20t_speakers_dqs1755 (8)

JBL L20T 2-Way Loudspeakers (Pair) Fully Restored 1 Year Warranty

$599

-

Jbl 4311_dqs1589_thuml 3

JBL 4311WX-A Speakers–Fully Restored– 1-Year WRT-Free 2 Pairs Colorful Grilles

$2,699

-

Recently viewed

You have not viewed any products yet.