The AAD 7001 is an amazing bookshelf speaker. From its specifications It can produce sound frequency from 25Hz to 60kHz. In actual listening in my room, it can produce bass as deep as my DIY floorstand speaker. The AAD 7001 is a very well balanced speaker and it produces accurate and high resolution sound. In term of tonal balance, it is natural, i.e. you won't find excessive bass, or very sweet sounding vocals from it. It is simply uncolored and will reflect the original recorded sound from your music source.
The 7001's enclosure's baffle and rear panel made of machined aluminum a full 0.5" thick and the four remaining panels of 1.5" MDF. All interior surfaces are lined with 1/8" thick lead sheets and are coated in turn with contoured acoustic foam. When I listen to the music, I tried to touch the enclosure and I can feel the vibration is almost nonexistence.
Because of the well constructed enclosure and the nature of the bookshelf speaker, the 7001 can produce an excellent 3D image and soundstage with the right recordings. Playing the "Jazz at the Pawnshop" SACD, the speakers just disappear! Well you can still see the speakers but the sound does not seems coming from it. The 3D effect is so real and life like, it seems a jazz band is in your room and you can pin point each instrutment's location.
The active 5.25" woofer's motor assembly includes a neodymium magnet and a 2" voice coil. Although the coil is far larger than common practice dictates, the combined coil/magnet motor results in superb control to reproduce deep bass cleanly and effortlessly. The metal alloy cone transmits this powerful motor's signals without flexing and distorting the resulting sound waves. It is a long throw woofer, when I play a 20Hz tone, I can see it move over a distance of more than 1 inch.
The user manual suggested a minimum of 100W amplifier should be used, while 300W is recommended. I am now driving this speaker with my BPA300 which produces 200W at 8ohm. When I played the XRCD "The Sheffield Lab Drum & Track Disc", this 5.25" woofer can produce a very fast and tight bass, with excellent dynamic and control, even at very high SPL.
200W of power can control this speaker very well, however, I believe it would perform even better with more amplification power. Rated at 86dB/watt/meter, the AAD 7001 is not very sensitive, but it can handle up to 300W of power to produce high sound pressure.
"A rear-mounted 6.5" passive radiator augments the active woofer without introducing the "chuffing" noise common to ported enclosures that attempt to reproduce the fundamental frequencies produced by tympani, organ, double bass, or special effects. It's suspension is made of neoprene rubber. In addition to being far more stable than foam, it contributes to the radiator's extraordinary 2" excursion capability."
This passive radiator is responsible for the low bass frequency, which is an essential component of orchestral music. When I listen to orchestra with most of the bookshelf speaker, I always feel something is missing. Without the low end, the orchestra would sound un-natural. With the AAD 7001 I can have a balanced orchestra sound.
In fact, the bass of the AAD7001 can go very low. Playing the Reference Recording CD - LIVE in San Francisco - 1976 - VIRGIL FOX, Johann Sebastian Bach:Prelude and Fugue in D, BWV 532, the AAD7001 produced the deep, rumbling bass from the pipe organ that shake your body. In terms of deep bass reproduction, the AAD7001 is one of the best bookshelf speakers I ever heard.
Note that the woofer and the passive radiator need quite a long time to break-in, it takes more than 300 hours before the bass loosen up and can go really deep.
"High frequencies are reproduced by one of the most sophisticated ribbon drivers available anywhere. A strong neodymium magnet places needed flux energy very close to the ribbon itself for the finest, most naturally detailed reproduction of critical information. In fact, this tweeter's response extends to well over 30 kHz without the resonances that so often result in a rough and fatiguing "edge" to the sound."
The tweeter is very finely detailed texturing, with excellent upward frequency extension. The tweeter sounds very clear and transparent, the highs are very well extended but not sounding harsh at all.
In order to have a better understanding of how it works, I have done some simple measurements. Please note that these measurements are not very well controled so there may be some in-accuracy.
Below is the near field frequency response measurement of each driver units,
Red trace - passive radiator response
Green trace - woofer response
Blue trace - tweeter response
You can see that the passive radiator is tuned to about 35Hz. The woofer-tweeter crossover point is at about 2800Hz. The elevated woofer frequency response below 600Hz looks like it is the Baffle Step Compensation added in the crossover, since the far field measurement showed a flat response.
Below is the in room far field frequency response, the mic is positioned at my usual listening position. The peak at 55Hz and the dips between 60Hz to 130Hz are caused by the room mode of my listening room. The frequency response is relatively flat, with the tweeter output a few dBs lower than the woofer. The -3dB point in my listening room is at about 30Hz, which is very impressive for a bookshelf speaker.
Conclusion : The AAD 7001 is a very well engineered studio monitor which gives very well balanced sound. The 7001 also excels in soundstage / imaging and it gives plenty of details. It is a bookshelf speaker that can produce bass as deep as a floorstand speaker. If you like accurate and uncolored sound, you will like this speaker. If you are looking for a bookshelf speaker and need the bass to play orchestra or jazz music well, this 7001 is for you. The deep bass it produces is among the best of bookshelf speakers. However, since this is a bookshelf speaker, it cannot compare with the large floorstand speakers in terms of bass impact and the ability to create very high SPL and high density soundstage in a large room. For a small or medium size listening environment, the AAD7001 will perform very well.
Frequency Response : 25HZ-60KHZ +/-2dB
Impedance: 8 Ohms
LF: 5.25inch Woofer Aluminum Cone,
Neodymium motor 50mm Voice Coil
HF: Horn loaded Neodymium Ribbon Tweeter
Bass loading: 6.5inch Passive Radiator
Power Handing: UP to 300watts
Sensitivity: 86 dB/watt/meter
Standard Finish: Aquamarine Tiger Maple or Piano Black, Cherry
Net Weight: 77Lbs / 35Kg
Official AAD 7001 web site : http://www.aadsound.com/products/Loadspeaker/7001/7001%20series.htm
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