AH-550

The AH-550 has a mouth diameter of 300mm and an axial length of 205mm to a 1” throat.  Throat sizes can be made up to 2” diameter.

The Le Cléac’h flare rate is 550Hz at 0.8 T factor, calculated from a 1” throat size.

International airmail available.

AH-550 Frequency Response Plots (JBL2420)

AH-425

The AH-425 has a mouth diameter of 420mm and an axial length of 260mm to a 1.4” throat.  Commissioned by Lynn Olsen for the ‘Beyond the Ariel’ project (see thread on diy audio)

The Le Cléac’h flare rate is 425Hz at 0.707 T factor calculated from a 1.4” throat size.
 
International airmail available.

AH-425 Frequency Response Plots

AH-340

The AH-340 has a mouth diameter of 600mm and an axial length of 340mm to a 1.5” throat. The horn sports the complete Le Cléac’h flare back.  Throat sizes can be made down to 1”.

The Le Cléac’h flare rate is 340Hz at 0.8 T factor calculated from a 1.5” throat size.
 
A version with a mouth diameter of 510mm is available (minimum roll back – looks more like the 425 and 550 horns). 

Larger throat models can be airmailed.

AH-340 Frequency Response Plots (Rank)

AH-340 Frequency Response Plots (TAD2001)

AH-340 Frequency Response Plots (JBL2420)

AH-204

The standard AH-204 has a mouth diameter of 800mm, with a throat of 170 mm (+/- as required) and an axial length of 310mm when made for 8” Lowthers.  A version with a mouth diameter of 650mm can be made.

Throat sizes can be made for smaller cone drivers or compression drivers down to 2” from a one piece mould.

The Le Cléac’h flare rate is 204Hz at 0.8 T factor calculated from a 168mm throat size.

AH-204 Frequency Response Plots (Yamaha)

AH-204 Frequency Response Plots (TAD2001)

AH-160

The 160 was the original Azurahorn, now available again from an accurate new mould. This is a large horn with 950mm mouth.  The axial length is 450mm when made for 8” Lowthers.  .

A flanged extension for throat sizes down to 1.4” can be made.

The Le Cléac’h flare rate is 160Hz at 0.8 T factor calculated from a 1.5” throat size.

AH-160 Response Plots (LowtherMP2A)

AH-160 Response Plots (Yamaha)

AH-160 Response Plots (Rank)

 Bass Horn

The ABH-50 Bass Horn is a 50Hz L-shape bass horn with a mouth area of 7700 sq cm proportioned to the Golden Mean. Throat diameter is 170mm and overall length is approx 2.3m. The expansion is 48Hz / 0.6 Hypex calculated using David McBean’s HornResp.

This horn works extremely well with a Lowther PM2A.   Larger drivers up to 12” or 15” can be used.  (I am presently using a Vitavox K15/40 in a 35 Litre enclosure)

 AH-50 Frequency Response Plots (Lowther)

AH-50 Frequency Response Plots (Seas)

 Plans are avaliable here

Not available for sale – offered as plans and inspiration only – though I do have moulds for the vertical section if needed by local die hard.

Push–Pull Bass Horn

The AH-PP Horn consists of a 204 front horn mounted on a folded plywood bass horn to the same expansion as above. 

The horns pictured have rear sections turned from solid Teak, but a square ply section can be used.

Thanks to Ronnie Safar for photos of push-pull horns

Plans are avaliable here

Not available for sale – offered as plans and inspiration only.  Join a small exclusive club (very small!)