Overview
This is a pair of JBL D1004 two-way, three-speaker corner-type speaker systems, released by James B. Lansing from around 1948 to the early 1950s. It is highly regarded as one of JBL’s earliest masterpieces.
JBL is the well-known long-established manufacturer founded by James B. Lansing after his independent departure from Altec, with the vision of creating the speakers he had always imagined.
The D1004 and D1005 are among the valuable D Series systems that the late James B. Lansing personally worked on toward the end of his life. They are traditional speaker systems that later became the foundation for speakers such as the Hartsfield.
Each enclosure is equipped with two 130B woofer units, delivering truly impressive bass power. The high-frequency driver is the gray-type 175, and the network uses the gray-type N1200, recreating the original configuration of the period.
As JBL’s first corner-type speaker system, it is no exaggeration to say this represents its ultimate form. The sound quality is exceptional, surpassing other corner-type systems. Even when compared with JBL’s Hartsfield, I felt the D1004 had the advantage.
Since each cabinet is loaded with two 130B units, there is absolutely no shortage of bass, producing a rich and powerful low end. The sharp, rich, and full-bodied mid-to-high frequencies of the 175 weave beautifully through the bass, creating a sound that is truly breathtaking. I also feel it is more than capable of handling modern audio sources.
Although it may be slightly less rare than the D130B, when comparing practicality alone, the 130B delivers punchy, rich, and heavy bass. The sparkling mid-to-high frequencies of the 175 cutting through that bass are simply outstanding.
The elegant appearance fully enhances the appeal of the sound. The enclosures, grilles, and units are all finished to an exceptional standard. Despite their age, not only the exterior but also the interior of the enclosures are in outstanding condition. As can be seen in the photos, the overall appearance is very clean.
Specifications
130B 32Ω
Serial Numbers: 12511 / 12512 / 15211 / 15212
This 130 unit, developed with the involvement of James B. Lansing, is highly regarded as one of JBL’s founding masterpieces.
Its basic design is still reflected in current JBL products and is also considered the origin of later 38cm cone-type full-range units. With a powerful internal magnetic circuit using an Alnico V magnet, it achieves a high sensitivity of 101dB/W/m.
From the time of its release, it was praised as being able to operate with even 1 milliwatt of input, and it remains an exceptionally high-efficiency unit.
Size / Diameter: 38cm
Impedance: 32Ω
Sensitivity: 101dB/W/m
Power Handling: 60W continuous program
Both the speaker cone paper and edges are in good condition, with no sagging, hardening, or deterioration. As can be seen in the photos, the appearance is very clean.
175 + H1217-1290 Horn 16Ω
Serial Numbers: 9755 / 9895
This is also an early 175 unit, highly regarded as one of JBL’s founding masterpieces and developed with the involvement of James B. Lansing.
This driver horn was developed using the techniques Lansing had cultivated through the dramatic transition from field-coil designs to Alnico V. It can be considered the ultimate evolution of earlier designs such as the field-coil 801 from his time at Altec and the 901 driver, which preceded the Alnico V era.
As can be seen in the photos, the exterior is very clean.
Throat Diameter: 1 inch / 2.5cm
Diaphragm: 1.75-inch aluminum
Magnet: Alnico V
Impedance: 16Ω
Frequency Range: 800Hz – 18,000Hz
Sound Pressure Level: 108dB
Voice Coil Diameter: 4.4cm
Dimensions: 114mm diameter × 98mm
N1200 Network 16Ω
Serial Numbers: 403170 / 406170
This is the earliest gray-type model.
This model uses non-inductive wire-wound resistors for the internal attenuator, resulting in a dramatic improvement in sound quality.
As can be seen in the photos, the appearance is very clean.
Enclosure Specifications
Serial Numbers: 1616 / 1617
External Dimensions, Each Cabinet: W885mm × H1285mm × D450mm
Weight: Approx. 60kg
As can be seen in the photos, the exterior is very clean.
Operation Confirmation Video
Sound output has been tested and confirmed. Operation is guaranteed.
