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HIFI Speaker active crossovers ...

Since the speaker and crossover are where most of the distortions and loss come from in the audio path, why has hifi not gone to active crossovers to eliminate these effects. Most active studio monitors and touring PA have... 

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Showing 3 responses by ditusa

ditusa's avatar
ditusa
1,934 posts
 

@mike_in_nc Wrote:

For an active crossover to make the most sense, the speaker needs power amps built in.

I don’t think so. The speakers below have an active crossover with no power amps built in and are excellent speakers. Also, my home audio speakers are actively bi-amped with no built in power amps and sound great. A speaker, with built in power amp(s), is called a powered speaker, active or passive is in reference to a speakers crossover topology. In my opinion, amps inside speakers is not a good idea because the amps are subject to all the vibrations and air pressure inside the speaker cabinet.😎

Mike

 

ditusa's avatar
ditusa
1,934 posts
 

@mike_in_nc Wrote:

@ditusa -- According to the owner’s manual, those JBLs have no crossover at all and should be used with a specific external crossover and specific amplifiers.

The crossovers are in the Crown amp design for the M-2 speakers. One Crown® iTech 5000HD power amp for each speaker, or One Crown® iTech 3x3500HD power amp for two (2) speakers. From the M-2 manual:

Specifications

System Format 2-Way Floor Standing or Soffit Mountable
HF Driver D2430K Dual Diaphragm Dual Voice Coil Compression Driver
LF Driver 2216Nd 15 in (381 mm) Differential Drive® Woofer
Crossover Frequency 800 Hz
Frequency Response (±3 dB) 20 Hz - 40 kHz
Coverage Angle 120° H x 100° V
Sensitivity 92 dB
Continuous/Peak SPL@ 1m 117 dB /123 dB; 108 dB Peak SPL @ 8m
The System Requires One Crown® iTech 5000HD power amp for each speaker, or One Crown® iTech 3x3500HD power amp for two (2) speakers.
Amplifier Power Rating 1,200 Watts into 8 ohms
Input Connectors Spring Terminals
Enclosure 25 mm (1 in) MDF
Finish Satin Black Lacquer
Included Removable ABS Grille with Black UL Compliant Fabric
Dimensions (w x h x d) 508mm x 1256mm x 355.6mm (20in x 49.5in x 14in)
Net Weight (each) 58.5 kg (129 lb)
Maximum Peak SPL 123 dB
Maximum Continuous SPL 117 dB

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What model is yours?

JBL model 4435 with JBL 5235 active crossover and JBL #52-5130 crossover cards design for 4430,4435 studio monitors. 😎

Mike

 

ditusa's avatar
ditusa
1,934 posts
 

@mike_in_nc Wrote:

An active xover divides the signal at line level.

You are correct. For a bit of history, see below JBL catalogs from 1964 and 1967, they offered powered and non powered speakers with passive crossovers. See 1964 catalog page #43 JBL solid state stereo energizer. The JBL Hartsfield was the first powered speaker in 1962. In 1972 JBL made the 4350A active only. 😎

Mike

https://www.lansingheritage.org/html/jbl/catalogs/1964.htm

https://www.lansingheritage.org/html/jbl/catalogs/1967.htm

 

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