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mercari Televisions, Audio, Cameras Audio Equipment Speakers / Woofers Home-built / Parts
Japanese cross-border
8cmフルレンジ デュアルコンセントリックダクト自作スピーカー
Price
3850円
(Tax included)
RM3850
Specifications
Quantity
-
+
Please remember to select product options (if applicable). If unsure about available options, please check the original product page. Orders with missing options may be canceled.
For purchases from mercari, we cannot assist with seller inquiries regarding ongoing transactions, shipping issues, product problems, or non-receipt of items. These situations are not covered by our standard guarantees. Please consider carefully before proceeding.
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Japanese cross-border products shipped directly from Japanese sellers
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Seller Rating
99.7% Good(378) Normal(0) Bad(1)
Condition
No visible damage or stains
Shipping
Free shipping to Japan
Listed Time
2026-05-10 07:20:01
Updated Time
2026-06-06 04:43:49

8cmフルレンジ デュアルコンセントリックダクト自作スピーカー

デュアルコンセントリックダクト
=同心異口径ダクトとでも表現しておきましょうか
TANNOYの同軸ユニットでは全然ありませんので〜
fdの異なるダクトを同心円状に配置して低域のアップを目指しました
計算では中心部が55Hz、外側が67Hzになるはず
これが本作品の売り!

他はどうと言う物ではありません(笑
メーカー製の4L程度のBOXにフロント、リアにバッフル追加し補強
ユニットはYAMAHA製、刃付ナットと六角穴付ボルトで固定
リアもバナナ可端子に変更
幅130 高232 奥225 各㎜

音はどうか
8㎝ユニットにやや大きめのBOXが効いて頑張って低域を出してます
チャーリーヘイデンのウッドベースもOK
8㎝なので高域ツィーターの必要も感じません
昔、フォスのFEで低域不足に悩んでいたのがウソのようです
FE83、103はボーカル最高とか評価されてましたが低域はバックロードにでもしないと全然足りない
それをバスレフでなんとかと低域出そうと涙ぐましい努力してたのです
無駄な努力とはこの事
「フォスよ、俺の青春を返せ!」と言いたい

脱線しました
肝心のダクトの効果ですね
ダクトから小気味良い低音が出てますが
普通のダクトとどの位違うのか…
正直わかりません(笑
でも、いいじゃないですか
苦労して作ったデュアルコンセントリックダクトから
夢のある音が出てると思えば
決して片方塞いで効果チェックしようなどと考えてる方は購入しないで下さい
If you have any product-related questions for the seller, please type and send your message in the chat box below. Letao will process your inquiry within 24 hours during our service hours.
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Notes:

  • The billing weight will be based on whichever is greater: the actual weight or the volumetric weight.
  • Volumetric weight (kg) = Length (cm) x Width (cm) x Height (cm) / 5000
  • Common oversized and heavy items include: furniture, fishing rods, automotive parts, etc.
  • Consolidating 2 or more items will incur a "consolidation handling fee" (see price list for details)
    

Platform Transaction Rules:

1. Order cancellations and returns are not accepted for any reason. Please review the item description and seller ratings before purchase.
2. Each mercari item is shipped individually. Orders from the same seller will be processed separately, resulting in multiple handling fees and local Japanese shipping charges. Combined shipping is not available.
3. As mercari does not have a negotiation system, we cannot provide price negotiation services.
4. We cannot assist with purchases for items marked as "Buyer Specified," "Bundle Deals," "Requires Buyer's Agreement (Not Buy It Now)," or "Partial Shipping of Order."
5. Buyers cannot demand specific shipping methods from sellers. Shipping will be as per the seller's offered options.
6. Requests for early shipping, post-purchase price reductions, or transaction cancellations after purchase cannot be accommodated.
7. Once items arrive at our Japanese receiving point, buyer feedback must be provided and payment released to the seller. Feedback cannot be modified, and negative or no feedback is not permitted.
8. Refusal of items is not allowed after they arrive at our Japanese receiving point.

mercari Proxy Purchasing Guidelines

1. After the first payment is completed, the order will be processed within the system-displayed timeframe.
2. Items on the website may sell out at any time. Completing the first payment does not guarantee successful purchase of the item.
3. Once our Japanese receiving point confirms receipt of the item, our staff will immediately provide feedback to the seller and release the payment.
4. We cannot provide negative feedback or withhold feedback to sellers based on member requests.
5. If the seller uses a shipping method without tracking (e.g.,【普通定形外邮件】、【メール便】 etc.), we cannot provide compensation for lost items.
6. We cannot communicate with or inquire to sellers regarding issues with ongoing transactions, items in transit, or problems with items received at our collection point (errors, damage, discrepancies, etc.).
7. This website is not covered by our standard guarantees. Please consider carefully before making a purchase.

1. International Shipping

Air freight: If the arrival notice exceeds seven days and the status of the goods is not confirmed, a customer complaint will occur and the seller will not be able to report it.

2. local delivery

After receiving and inspecting the goods, if you have any questions, please contact Alfred 24 customer service staff within 48 hours after receipt, and let Alfred 24 make a decision. letao will try its best to provide relevant information to assist members in processing. The following are reminders:

1. You can leave a message through "Customer Service Message" and provide local express delivery in Order number and have the following information ready:
● Product outer box/unboxing photos
● Photos of damaged goods

2. Alfred24’s liability for any shipment, including but not limited to loss or damage, is limited to actual direct losses and shall not exceed the upper limit of HK$500 per shipment; if it is sent to a Post Smart Mail station or post office The maximum compensation limit for each shipment is HKD 320.

The following are product types that are not eligible for compensation by Alfred 24:
▲ The shipment is flammable or explosive, or is easily moldy, rotten and/or discolored, etc.
▲The shipment is fragile
▲The shipment is a liquid product
▲The recipient’s address is incorrect or invalid
▲The recipient’s contact number is invalid or the text message cannot be received
▲Any unpredictable or force majeure factors
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Customer Service Email: service@letao.my