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Flute Acoustics - Part 7 - So now let's look at the acoustic impedance spectrum of the modern flute. We'll choose the fingering used for C#5 and C#6...

from Abt.com

Bowers & Wilkins Black P7 Wireless Over-Ear Headphones

Combines Advanced Acoustic Technology With aptX Bluetooth Connectivity/ Seamless Audio Experience And 17 Hour Battery Life/ Over-Ear Pads With Memory Foam Cushions Are Designed To Optimise Air-Flow And Block Outside Noise/ Circum Aural Wireless Headphone/ 10Hz To 20kHz Frequency Range/ 22 Ohms Impedance/ 111dB/V At 1kHz Sensitivity/ 370mAh Lithium Polymer Battery/ Black Finish

from Chicago Music Exchange

Danelectro '56 Single Cut Bass Black

From Danelectro: High impedance, high output Lipsticks® produce rich, round bass tones. Unlike anything else. Short scale. Specs: - Single cut body shape - "Dolphin" headstock - short-scale nec

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This video describes how to calculate acoustic impedance based on density and speed of propagation and describes some of the importance of acoustic impedance.

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JJ Cale's favorite guitar was this old fifty dollar Harmony, made backless for easier access to the electronics. Originally it was a round hole acoustic, but he added five pickups for making records and playing concerts. Four of the pickups are Gibson, two of which are low impedance for recording direct. The other bar type pickup came from a Sears Silvertone guitar, it was manufactured by Dano Electro. The guitar has three high impedance outs and one low. RIP JJ Cale.

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Epiphone Jack Casady Signature Semi-Hollowbody Electric Bass: Pairing acoustic bass tone with the responsiveness of a low-impedance pickup, the Jack Casady semi-hollowbody bass offers premium playability and performance.

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from Instructables.com

Portable Guitar Amplifier - DIY

Welcome To "Sam Technology Professionals" Hi Guys..!! This is a portable guitar amplifier with some exclusive function. It gives you clean sound, bright & loud sound and distortion guitar sound. Even if you connect a semi acoustic guitar it will work as it do. It is good for high impedance pickups and microphones as well. ________________________________________ Details : It is based on two IC "LM386" and some capacitors and resistors. It works fine. Its is easy to bui...