A pair of front-horn speaker enclosures designed with reference to the ALTEC 211. The curved laminated horns are finished with Honduras mahogany veneer and oil. Enclosures only; drivers, damping material and mounting hardware are not included.
Enclosures only. Drivers, damping material and hardware are not included.
The front horn is formed by laminating and bending thin plywood. The intended sound is natural and easy to listen to, with expressive vocals and brass instruments. Results depend on the drivers and listening environment.
In listening, the sound had a sense of presence, with a rich midrange on brass and vocals and a natural, easy-to-listen-to character. Listening impressions vary with the drivers and the room.
Reddish-brown veneer on the curved horns contrasts with the lighter cabinet. An oil finish leaves the grain visible. Grain and colour vary between pieces.
The driver opening is 170mm in diameter. Please check mounting dimensions and frame shape before purchasing, including when using a nominal 20cm (8-inch) driver.
| Product | Wooden front-horn enclosures |
|---|---|
| Made by | Sinrin Works — an original build inspired by the ALTEC 211 |
| Sale unit | One pair (two enclosures) |
| Dimensions (each) | W320 × D340 × H596mm |
| Cabinet material | Lauan and shina plywood composite |
| Cabinet thickness | 20mm |
| Horn | Laminated plywood / Honduras mahogany veneer |
| Finish | Oil finish |
| Intended drivers | 20cm (8-inch); check mounting dimensions before purchase |
| Driver opening diameter | 170mm |
| Included | Enclosures only; no drivers, damping material or hardware |
| Shipping | The pair ships as two separate parcels |
Choose a 20 cm driver to compare its modeled response in this front horn. The simulator controls are in Japanese.
ALTEC 211タイプのフロントホーンに20cmユニットを取り付けたときの周波数特性を比較できます。登録ユニットを選ぶか、お手持ちのユニットの数値を入力してください。
「ホーン前面」と「ダクト」は、それぞれの開口から出る音の音圧です。「合成」は、両方の音を位相まで含めて足し合わせた結果です。比較用のユニットを選ぶと、その合成音圧が破線で重なります。
紫の縦線は、ホーンの広がり方から求めた換算カットオフ（約299 Hz）です。
ユニットごとの音圧差を見るには「同じ電圧で比べる」、カーブの形を比べるには「200 Hzで音量を揃える」を選んでください。
この箱のホーン形状と直径170 mmの音響開口を使い、正味容積を32 L、ダクトの同調周波数を40 Hzとして計算しています。入力は2.83 Vrms、距離は1 m、放射条件は半空間です。
ユニットのT/Sパラメータを使った小信号モデルです。振動板は一体で動き、ホーンの各断面内で音圧は一様と仮定しています。ユニット固有の分割振動、指向性、開口端の回折、高次モード、部屋の反射、大音量時の歪みは計算の対象外です。
この箱に取り付けたときの周波数特性（計算値）
拡大すると、グラフを上下左右にスクロールできます。
No. These are empty enclosures, with no drivers, damping material or hardware. Please confirm compatibility with your intended drivers before purchasing.
Check the linked Yahoo! Auctions listing for price, availability, shipping and dispatch terms, and complete the transaction there. For specification questions, contact us by email or social media DM.
The pair is packed as two parcels and taken to a Yamato Transport service centre within 1–2 days of payment. Shipping costs depend on the destination.
International shipping is being prepared. Please include your country and postal code in your enquiry.
Equal spacing
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Cut planning & inventory
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Proportions & drawing
Create proportion-based shapes and guides, check dimensions, and export SVG or PDF.
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Speaker design calculations
Calculate enclosure volume, bass-reflex ports and horn dimensions, and keep your initial speaker designs together.
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