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Yahoo Bid Home Appliances, Audio & Video, Camera Audio Equipment Speakers General Fostex
長岡鉄男氏考案『ダブルベース』準無指向性 20㎝×2 背面無垢材バッフル使用 PIONEER製エンクロージャー流用 41リットル密閉式 4Ω60W
        

内部構造

吸音材目一杯充填!

ソニーのウーファー修理済跡

パイオニアのツィーター修理済跡

ソニーのウーファー修理の当て和紙

回路図、数値は違います。

  • Product Quantity
    : 1
  • Starting Bid
    :4,800円
  • Highest Bidder
    : eik******** / Rating:1672
  • Listing Date
    :2026年02月01日 21時48分
  • Bidding closes on
    :2026年02月08日 21時48分
  • Auction Number
    :w1206429328
  • Condition
    :Damaged and stained (specify in description)
  • Automatic Extension
    :Yes
  • Authentication
    :No
  • Early Closing
    :Yes
  • Can I return the product?
    :no
  • Description
  • Q&A ()
  • Cost Estimator
  • Problem Item Response Procedur
Notes
  1. The product may be dented or collapsed, please ask clearly and pay attention before placing a bid.
  2. ※Please confirm whether it is animal fur. Animal fur products are in conflict with the Washington Treaty and cannot be shipped internationally.

長岡鉄男氏考案のダブルベースを、パイオニアのフロアースピーカーのエンクロージャー等を流用して作ってみました。長岡氏のダブルベースが内容量35リットルに20cm×2なので、41リットルでは、少し大きめなので、密閉式にしました。裏板は新たに12mm厚の杉無垢材バッフルを使用しました。


前のユニットはSS-L250から取り外したソニー製。コーン紙が紙製、センターキャップは布製、エッジも布製で劣化の心配はありません。マグネットは径74mm厚さ10mmのフェライト・マグネット、インピーダンス8Ω、最大入力は60Wです。センターキャップには凹み修正跡、コーン紙には裂け目があったので、書道用和紙で補修してあります。紙製、長岡氏の記事に従って12dBのクロスオーバー・ネットワークを取り付けました。1.0mHと3.2μFで、クロスオーバー周波数は1.8kHzです。


後ろのユニットはCS‐F300から取り外したCS-パイオニア製20‐733F。コーン紙は紙製、センターキャップは布製、コルゲーション・エッジは紙製でで劣化の心配はありません。マグネットは径65mm厚さ10mmの極小フェライト・マグネット、インピーダンス8Ω、最大入力は30Wです。


パラレル接続し、システム・インピーダンスは4Ωです。


5cmコーン・ツィーターはもパイオニア製。コーン紙は紙製、センターキャップも紙製、マグネットは径45mm厚さ10mmのフェライト・マグネット、センターキャップには凹み修正跡があります。インピーダンス8Ω、4.7μFと0.6mHを挟んで、クロスオーバー周波数は3.0kHzです。


ちょっと中抜けしてますが、長岡氏もこれで良いと書いてます。ウーファーとターミナル間はカナレタイプのダブル・ワイヤリングのケーブルで繋ぎ、吸音材はクリスキットに倣って目一杯充填しました。


試聴では、ペダルトーンで埋め尽くされているJ.S.バッハのペダル練習曲BWV598(手持のテストCD;トン・コープマン:1734年製ミュラー・オルガン;アムステルダム;最低音36Hz)を、見事なバランスで鳴らしました。この曲は勿論足鍵盤の練習用でもありますが、当時最高のオルガン・コンサルタントでもあったバッハが、すべてのパイプがちゃんと鳴っているかどうかのチェックをするための曲でもあり、スピーカーにとっては、低域に変なピークやディップがないかどうかのテストとしても使える便利な曲です。もちろん変なピークやディップはありません。


本格的試聴では、J.S.バッハの前奏曲とフーガハ短調BWV546(手持の最強テストCD;トン・コープマン:ミュラー製作オルガン1734;最低音32Hz)の最初のCのロングトーンは、かなりの大音量でも大迫力で鳴らしてくれました!20cmが付いていたオリジナルのパイオニアのフロアースピーカーより迫力があります。密閉式なので、バスブーストが面白いように効きます。


バッハの最高傑作、前奏曲とフーガハ短調BWV548(手持のテストCD;トン・コープマン:1692年製シュニットガー・オルガン;フローニンゲン:最低音36Hz)の方は、更なる大音量でも、満足いく迫力で鳴らし切りました。


システム・インピーダンスのせいか、ダブルベースらしくなく能率は高めです。


外観は概ねキレイですが、年代物なりの小傷はあります。サランネットは無事です。


重さ8.8kg、サイズは62×31×29cmです。



(2026年 1月 11日 17時 16分 追加)


2026年、ガソリン税率が下がって、直接配達が20%オフになりました。

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A 10% consumption tax is applied to goods and services in Japan. The price may include the tax or it may be added separately. Please check the price details when ordering.

Note: This is a domestic sales tax applied within Japan.

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Product Weight KG The maximum weight limit is 30 kg
International Shipping Methods
Proxy bidding and purchasing services are becoming increasingly convenient. However, overseas shopping carries certain risks and issues. To reduce these risks and enhance shopping safety, please be sure to read the following information:

1. International Shipping

   Air Freight: If the item status is not confirmed within two days after the arrival notice, any customer complaints cannot be addressed with the seller.

2. After Receiving the Product

Please confirm and inspect the product as soon as possible to ensure that the product specifications, quantity, accessories, and description are correct

If, unfortunately, there are any issues, you can refer to the following examples on how to report related product problems:
1. Example of missing product information
2. Example of product not matching provided information
3. Example of damaged product information

Important Notes: 1. If the seller is unwilling to ship overseas or is unaware that the product will be shipped overseas, the international shipping cost for returns or exchanges will need to be borne by the member. You may refer to the EMS e-Express fee inquiry from the post office. If it involves alcoholic beverages or items that affect flight safety, the post office cannot be used for shipment, and only DHL can be used to ship back to Japan.
2. During the product complaint handling period, please retain the complete outer packaging of the product (including the shipping label information), and refrain from attempting any repairs or altering the original condition. Any modifications may result in the inability to process the case.

3. After Inspecting the Product

After receiving and inspecting the item, if you have any questions, it is recommended to contact Letao within 2 hours. Here are some reminders:

1. Please do not unpack, use or repair the received item yourself, and be sure to keep the original packaging to facilitate subsequent handling of related matters, so as to avoid changes to the item that may cause the seller to be unwilling to process.

2. You can call customer service, and the customer service will leave a message for you as below. Please provide the following information:
"Hello, we will first help you establish a complaint case for Product ID: _______ .But we need you to 2-3 clear photos of the product issue, including photos of the product problem, product packaging, shipping details slip, and outer box. Send them to service@letao.my and inform us of your desired resolution (failing to provide this may result in an inability to process subsequent matters). After sending the email, notify us in the customer service message. We will confirm with the seller as soon as possible. and if there are any related questions, we will contact you through the customer service message. Thank you for your cooperation."

Please provide:
1. "Product ID"
2. Photo of the "Delivery Note" (if any)
3. Photos of the outer box (including inner and outer packaging)
4. Photos of the product (Please include relevant descriptions to help us confirm with the seller)

Important Notes:
1. Do not include foreign text or other products in the background of the image.
2. Please keep the complete product packaging (including the shipping label information), and refrain from repairing or altering the original condition on your own, as any changes may result in the case being unable to be processed.
3. Please provide the relevant information within 48 hours to avoid missing the golden hour for reflection and causing situations that cannot be handled.
4. Due to 99% of Japanese sellers being unwilling or unaware of shipping goods overseas, if a seller is willing to handle the issue, the goods must be sent back to Japan, and the international shipping costs incurred must be borne by the member. Letao will use postal EMS international express to send the goods back to Japan.
5. As the goods are purchased from overseas, it may take approximately one to two weeks to complete the relevant processing procedures when issues arise with the goods. Please be reminded that you can inquire about the approximate cost through the EMS service at the post office.

4. FAQ

1. Issue of Authenticity: If antique or branded goods are found to be counterfeit upon receipt, clear photos showing the differences between the genuine product and the imitation must be provided as evidence. If unable to provide relevant proof, assistance can be sought to find a third-party reputable organization for a premium authentication service .
2. Leaking Iron Teapot: If an antique iron teapot is leaking, please take clear photos of the leaking area and provide them.
3. Transport Damage: If the goods are damaged during international shipping (to the pickup point), you need to provide photos of the outer packaging of the parcel and clear photos of the damaged goods' outer packaging.

※ Note: Photos provided to sellers should not contain any foreign-related information.
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    Product name: 長岡鉄男氏考案『ダブルベース』準無指向性 20㎝×2 背面無垢材バッフル使用 PIONEER製エンクロージャー流用 41リットル密閉式 4Ω60W
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao.my