AH550
The AH550 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.
AH550 Frequency Response Plots (JBL2420)
AH425
The AH425 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.
AH425 Frequency Response Plots
AH340
The AH340 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.
AH340 Frequency Response Plots (Rank)
AH340 Frequency Response Plots (TAD2001)
AH340 Frequency Response Plots (JBL2420)
AH204
The standard AH204 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.
AH204 Frequency Response Plots (Yamaha)
AH204 Frequency Response Plots (TAD2001)
AH160
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.
AH160 Response Plots (LowtherMP2A)
AH160 Response Plots (Yamaha)
AH160 Response Plots (Rank)
Bass Horn
The ABH50 Bass Horn is a 50Hz Lshape 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)
AH50 Frequency Response Plots (Lowther)
AH50 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 AHPP 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 pushpull horns
Plans are avaliable here
Not available for sale – offered as plans and inspiration only. Join a small exclusive club (very small!)
