Speaker System No.3154 --- 10" 2-way Back Loaded Horn

Speaker System No.3154 is a 10" 2-way Back Loaded Horn Speaker designed for maximum sensitivity in a reasonable form factor. Providing effortless dynamics, palpable and nuanced bass that will truly activate the air in your listening space. With a full 100dB* of bass output from a single watt of power, you can be guaranteed maximum performance from your low power amplifier.

The back loaded horn cabinet design is inspired by the Nagaoka designs which gained prominence in Japan in the 1980's. These cabinet designs differed from the classic JBL 'scoop' designs by having a much longer horn path length, deepening the bass extension, making more suitable for consumer audio where full bandwidth is required. This exclusive Joseph Crowe BLH design was first simulated using AJ Horn software, which is able to simulate not only the horn response based on throat area, mouth area, horn length, and flare rate, but also can factor in other variables such as throat damping. This particular aspect is crucial to fine tuning the subjective sound character. 

Sound Character 

• Extremely dynamic bass extending to 30Hz (see plot) 
• Palpable and nuanced bass 
• Smooth sound character (no harshness, optimized for long listening) 
• Great low level detail retrieval even at low listening levels 
• Spacious soundstage 

Applications

• Small, medium, and large listening spaces 
• Low power tube amplification or high power solid state

Features

• 10" Back Loaded Horn 
• Bass Extension to 25Hz (in-room F10) (see graph below)
• *100dB Sensitivity (measured at 70Hz IN-ROOM, 2.83v, 1m)
  • For comparison the Markaudio CHR120 (6.5" full-range) in 1cu. ft. bass reflex cabinet --- 75.5dB Sensitivity (measured at 70Hz in-room, 2.83v, 1m)
    
  • "In-room" specification is an approximation rather than a specific calculated amount. Factors such as room size, front wall distance, side wall distance, all impact the final in-room sensitivity amount. 
• 8ohm nominal impedance
• 2-way 
• 700Hz Crossover Point 
• 1" Compression Driver, Custom Made 
• Dipole hypercardioid radiation (compression driver radiates out back, -9dB compared to front)

• 700Hz 1" Biradial Wood Horn (Solid Walnut or Concrete)
• 10" Woofer custom made in France
• Cabinet constructed from 18mm thick baltic birch plywood 
• Finished in satin black paint 
• Outriggers with ISO Acoustics Gaia lll feet (Walnue or Concrete)
• Custom rear decal hand signed by Troy J. Crowe
• Custom decal options include "Made for (your name here)"
• Point to point wiring, Mundorf EVO Oil capacitors, 14 Gauge air core inductors 
• WBT Binding Posts 
• Silver coated internal wire 

Bass Extension 

Bass extension is characterized as flat to 40Hz using a -3dB downpoint (F3) with 25Hz being -10dB Down (F10). The response graph below is the REW in-room response with the speakers placed 1m from the front wall and 2m from the side wall. Mic distance is 2m. 

Physical Measurements