HS-PX30 / HS-PX303 / HS-PX900
Part II
QUICK 15 Minute Recharger
Headphone stereo users are discovering the economy of rechargeable batteries, yet often find long recharge times inconvenient. AIWA has developed a unique battery system that recharges are just 15 minutes for convenience that matches the economy of rechargeability. The secret is the use of a flat lead-acid battery instead of nickel-cadmium (Ni-Cad) batteries common to conventional rechargeable systems. Lead-acid batteries, the same type used in cars, offer distinct advantages in the recharge cycle to enable faster recharging.
High Power for High Fidelity with Rechargeable Convenience
AIWA Rechargeable headphone stereo models deliver higher output power for better sound quality. Our models are rated between 10 and 15mW per channel, higher than the 5mW per channel typical of rechargeable models from other manufacturers. The higher output of AIWA rechargeable models allows for more amplification headroom before distortion occurs, as the chart shows. As you can see, distortion can result, particularly in musical peaks, within the normal listening range in models rated at only 5mW per channel. AIWA models rated between 10 and 15mW per channel deliver smooth, strong amplification of the entire music signal, even highly dynamic sound peaks.
Frequency response: 10~20,000Hz
Sensitivity: 104dB
Impedance: 40 ohms
Max. input power: 200mW
Weight: 80g without cord
Cord length: 2.0 m
More Bass In-ear with the AIWA HP-V22 Earphones with Remote.
The convenience of in-ear headphones has unfortunately been accompanied by a reputation for weak bass response. To remedy this within the size limitations posed by the in-ear design, AIWA has developed a miniature bass resonator duct that achieves a startling improvement in bass response, while also enabling clearer sound reproduction through a wide frequency range. The bass resonator ducts extend behind the diaphragm, enabling it to achieve a lower resonant frequency for a strong deep bass response with optimum clarity. • Powerful Samarium-Cobalt drivers magnets. • Oxygen-free copper wire cord improves conductivity to minimize signal loss for clear highly accurate sound resolution. • 15mm Dynamic Acoustic ports.
The convenience of in-ear headphones has unfortunately been accompanied by a reputation for weak bass response. To remedy this within the size limitations posed by the in-ear design, AIWA has developed a miniature bass resonator duct that achieves a startling improvement in bass response, while also enabling clearer sound reproduction through a wide frequency range. The bass resonator ducts extend behind the diaphragm, enabling it to achieve a lower resonant frequency for a strong deep bass response with optimum clarity. • Powerful Samarium-Cobalt drivers magnets. • Oxygen-free copper wire cord improves conductivity to minimize signal loss for clear highly accurate sound resolution. • 15mm Dynamic Acoustic ports.
Frequency response: 15Hz~30,000HzSensitivity: 105dB
Impedance: 16 ohms
Max. input power: 40mW
Weight: 5g without cord
Cord length: 1.5m
AIWA HS-PX30 CassetteBoy Japanese Blue Box with silver lettering, earphones version.
Left: AIWA HS-PX900 US Black Box. Right: HS-PX303 World Yellow Box. Both Headphones type.
AIWA HS-PX303 Headphones type - World version.
Left: AIWA HS-PX900 US Headphones type, top Box. Right: HS-PX303 World earphones type Box.
AIWA HS-PX30 CassetteBoy with accessories.
AIWA HS-PX30 Japanese Owner's manual.
AIWA HS-PX30 Japanese Owner's manual.
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Left: HS-PX900 1989 US Brochure. Right: AIWA HS-PX30 January 1990 Catalog.
Left: HS-PX30 May 1989 Japanese Catalog. Right: AIWA HS-PX30 February 1990 Catalog.
AIWA's Flagship Powered Speakers accompanied by HS-PX30.
AIWA HS-PX303A July 1989 Hong Kong Catalog.
AIWA HS-PX303A March 1989 World Catalog.
AIWA HS-PX303 Accompanied by HP-V99 Hi-End Earphones. (March 1989 Accessories Catalog)
The HS-PX30 is a remarkable player that was built for one reason: to be the perfect Hi-Fidelity player to date. It has almost everything in order to achieve that aim. There are many aspects to the AIWA HS-PX30 in terms of sound quality. In order to achieve the wide sound spectrum, that it provides, it has to feature a wide frequency range from deep heavy bass to detailed clear trebles. This wide spectrum is achieved by two things.
Hardware
The first thing is the lower bass, which has two technical features.
The HX Amorphous Head has a high contribution to that bass and the ability to reproduce those low signals because it has a special cut tape head that reduces the aberration from 3dB to 1.6dB at low frequencies. Amorphous alloy displays exceptionally high maximum magnetic flux density, outstanding signal linearity, and minimal noise generation. Then it has the Parametric DSL circuitry, which dynamically enhances bass output by varying the amount of attenuation according to the input signal level. The result is more natural-sounding bass enhancement at all listening levels. The DSL can provide very pleasant loudness and can also emphasize low signals in quiet passages.
The Second thing in the sound spectrum is the high frequencies - trebles. Here we have a special and unique way to maintain high-quality sound: The Bi-azimuth Head Alignment. It automatically compensates for head alignment inaccuracies which are common to auto-reverse tape drive systems with fixed heads. When the tape reverses direction, its position shifts slightly, causing a shift in azimuth - the relative angle of the tape to the head. In either tape direction, absolutely precise azimuth alignment is essential for optimum response, particularly in the high frequencies. This essential is vital for enjoying the Dolby C Noise Reduction which cuts the hiss perfectly. You should know that any Hi-Fi player with Dolby C that doesn't have (or had) azimuth adjustment will never sound the same as one that does.
Evaluation
The HS-PX30's overall sound is natural and quite amazing for its size and limitations, it is truly amazing how the performance and signal-to-noise ratio (48dB) is far better than any other player in its class. Using the Yamaha Monitor Headphones RH-5Ma - a perfect match with the PX30's (10mW per Channel @ 32Ω). Aiwa's slogan: "No One Gets Closer" is more than accurate in this case. It resembles what Marantz's introduction to the Pre-Amps market was all about - unprecedented sound reproduction.
Tape Type
When using a Normal bias tape (TEAC Sound 52) the sound was sharp and clear and was accurate enough. However, only when you change to a CrO2 tape type (TEAC Cobalt 52) you can hear the difference in both the crystal clear highs and more soundstage. The Metal tape (TDK MA-XG 46) was beautifully balanced with an even soundstage as expected from many Hi-Mid range cassette decks.
The DSL
The HS-PX30 provides a warm bass indeed in most listening environments. It does that without the need to switch the DSL on. However, if you are a big fan of deep bass, then I recommend lowering the volume first and then switching it on and set it to "Low Frequency" and "Level 1". Be careful! The HS-PX30 Bass is very deep. The DSL's "High Frequency" option is not suitable for all tastes, I myself barely use the DSL's High Frequency, In my opinion, it is too boomy and sound could be easily distorted.
Bottom Line
All these features make the HS-PX30 one of the best Personal Hi-Fi players available. If you want to experience a truly analog sound out of a portable player then you should try the AIWA HS-PX30 - a True Hi-Fi Player!
PS: It came to my attention that there are some wannabes - copycats who think they can provide a sound evaluation to Hi-Fi Players such as the HS-PX303 with lots of technical software mumbo-jumbo that just look impressive. Sound quality is a highly subjective matter! These amateurs read articles and reviews and try to impress whoever falls for their unqualified skills and amateurism, while they try to promote their mediocre taste in sound. It's embarrassing! One example: based on my article "Is it all in your headphones?" (that was first published on the old "S2G" forum in 2010 as part of four articles) One of these amateurs wrote, "to evaluate the player, I let it warm up for half an hour". What? hahaha, lol I couldn't stop laughing, is it the "BEST" car "EVER" that you need to warm it up!?
So, I'll lay it on the line for you. In order for one to provide a serious review of HiFi equipment, at least you will need to have knowledge of electronics and acoustics, some practical skills, a good sense of rhythm and timing, technical skills, graduate from a sound or audio school/s, etc. Above all, one needs to have experience and a natural sense of sound and music qualities. All those do not come easily. None of this is accidental stuff or comes from Wikipedia readings Hugo Rodriguez!!
So, I'll lay it on the line for you. In order for one to provide a serious review of HiFi equipment, at least you will need to have knowledge of electronics and acoustics, some practical skills, a good sense of rhythm and timing, technical skills, graduate from a sound or audio school/s, etc. Above all, one needs to have experience and a natural sense of sound and music qualities. All those do not come easily. None of this is accidental stuff or comes from Wikipedia readings Hugo Rodriguez!!
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AIWA HS-PX30 / PX303 / PX900 Service Manual Cover and Disassembly page
Specifications:
Power source:
Battery DC 2V,
Battery DC 2V,
Rechargeable lead battery (PB—3) X 1
Battery DC 3C, LR-03 (UM-4, AAA, R03) X 2
Domestic AC power (using AC adaptor)
Battery life:
Rechargeable lead battery (AIWA)
Approx. 2.5 hours (EIAJ, PB 1mW/15 minutes recharging)
Approx. 3.5 hours (EIAJ, PB 1mW/1 hour recharging)
Approx. 3.5 hours (EIAJ, PB 1mW/1 hour recharging)
Dimensions: (WxHxD): 3"x 45/16"x 1 "1/8"
Weight: 6.3 oz.
Including Accessories:
Stereo Headphones with Remote Control.
AC-207 AC Adaptor/Battery Charger.
PB- 3 Rechargeable Lead Battery Cell.
Battery Case.
Carrying Case.
Optional Accessories:
Extra Rechargeable Lead Battery (PB-3)
Battery charger (RB-202)
Technical Specifications:
Maximum output:
15mW + 15mW (EIAJ/16Ω)
10mW +10mW (EIAJ/32Ω)
Frequency response:
63Hz~8kHz±3.5dB (NORMAL)
63Hz~10kHz±4dB (Cr02, METAL)
Signal noise ratio: 48dB
Wow & flutter: Less than 0.45% (RMS)
Noise level: Less than 3mV (VOL MAX)
Distortion: Less than 3%
Pinch roller pressure: 150 -20 g-cm
Take up torque: 33±6g-cm (FWD, REV)
FF torque: 100±30g-cm
Rewind torque: 100±30g-cm
Maximum output:
15mW + 15mW (EIAJ/16Ω)
10mW +10mW (EIAJ/32Ω)
Frequency response:
63Hz~8kHz±3.5dB (NORMAL)
63Hz~10kHz±4dB (Cr02, METAL)
Signal noise ratio: 48dB
Wow & flutter: Less than 0.45% (RMS)
Noise level: Less than 3mV (VOL MAX)
Distortion: Less than 3%
Pinch roller pressure: 150 -20 g-cm
Take up torque: 33±6g-cm (FWD, REV)
FF torque: 100±30g-cm
Rewind torque: 100±30g-cm
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