Sydney Audio Club Meeting - January 2024
Sunday 21st January 2024: The first meeting for 2024 will be a presentation of some classic vintage equipment from the resources of members Paul B, Ian R and James L. Come and hear how the classic vintage sound can compare with more recent equipment. The doors will be open from 1:00pm to meet and chat with members before the meeting starts at 2:00pm.
Note that there will Not be a 'Tech Talk' at this meeting.
Note that there will Not be a 'Tech Talk' at this meeting.
Dear members and friends of Sydney Audio Club Inc,
The first Club meeting for 2024 will be held on Sunday 21st January with a presentation of some classic vintage equipment from the vast treasure trove of resources of members Paul B, Ian R and James L. Come and hear how the classic vintage sound can compare with more recent equipment. The doors will be open from around 1.00 pm to meet and chat with members before the meeting starts at 2.00 pm.
There will be no Techtalk this month.
Guests are welcome – we are a very friendly club so you don't need to know anyone to join us for an afternoon of fine music and sound.
Details of the system for January 21:
Speakers: Bowers & Wilkins DM220 from around 1984 - two pairs stacked vertically.
They are a 3-speaker 3-way sealed bookshelf design handling up to 100 Watts into 8Ω with a frequency response from 53 Hz to 20 kHz ± 3 db.
Output sound pressure level 90dB/W/m
Crossover frequency 500 Hz, 3 kHz
External dimensions Width 290 x Height 680 x Depth 320 mm
Weight 15.1kg
Two 20 cm cone type woofers are mounted in the low range and drive the band of 500 Hz or less in parallel. A fiber cone is used for the diaphragm, and high efficiency and excellent transient characteristics are obtained by driving with a strong magnetic circuit while aiming at low mass.
In addition, the roll-off characteristics of the unit itself match those of the secondary Butterworth filter, and by simply passing the secondary Butterworth filter through one stage, the characteristics of the fourth Butterworth filter (24dB/oct) are reasonably realized. This gives ideal slope characteristics, and by realizing steep attenuation characteristics at the crossover point, interference to the high range of the woofer is effectively suppressed.
A 2.6 cm soft dome type tweeter is installed in the high range.
The diaphragm is made of polyamide film, which has high internal loss and low high-frequency resonance, enabling natural and accurate high-frequency reproduction.
https://audio-database.com/BandW/speaker/dm220.html
Amplifier: We have two amplifiers to choose from and possibly compare.
Audiolab 8000P Stereo Power Amplifier
Power output: 100 watts per channel into 8Ω (stereo)
Total harmonic distortion: 0.05%
Signal to noise ratio: 95dB
The Audiolab 8000P Stereo Power Amplifier is a vastly underated amplifier. The 8000P was loved by many but also hated by a few others. The main criticism being that it could sound a little sterile, where as those people that loved the Audiolab 8000P Stereo Power Amplifier pointed to it's excellent imaging and bass.
Pioneer SA-7500 Amplifier
Power output: 45 watts RMS per channel into 8Ω (stereo)
The Power Amplifier section uses 1-stage differential amplifiers direct coupled OCL
Outputs: A, B and A + B
The Preamplifier section Equalizer is 3-stage direct-coupled and the Control amplifier is 2-stage direct-coupled with 1 FET, NFB type.
Total harmonic distortion: 20Hz – 20kHz no more than 0.05%
This good old amplifier has independent Bass and Treble controls with Loudness, Hum and Noise filters – remember those !!
DAC: Topping D30Pro Desktop USB Balanced DAC
The Topping D30 Pro is a quad-CS43198 chipset desktop DAC with preamp capability offering up to DSD256 and PCM 32BIT/386kHz decoding
Sound of Quad DAC
The 4 x CS43198 provide a total of 8 full balanced channels. So each channel of the D30Pro will be arranged in parallel by 4 conventional balanced channels. The increase in output capability will bring changes in the sound and the spec will also improve.
USB support DSD256 & PCM384kHz high resolution audio
D30Pro uses 2nd generation 8 core XMOS XU208, USB supports up to PCM32bit 384kHz and DSD256 native.
Selectable output port
D30Pro has full balanced XLR output and single ended RCA output. You can choose "XLR only", "RCA only" or "XLR+RCA" output to meet different usage requirements.
Preamplifier function
D30Pro has a preamplifier function so you can control the output volume on the front panel and also at the remote control. Since it's noise is <0.9uVrms@SE out and <1.1uVrms@BAL out, which is significantly lower than other similar products, it is very suitable for connecting to power amplifiers or monitor speakers.
A lot of effort is used to achieve everything above CPLD focusing on clock processing and digital signal optimization, restoring what the digital signal should be. We use up to 8 independent LDOs to supply power to different loads, so there is no longer interference between different loads. Both RCA and XLR have reached the 120dB SINAD, so that RCA transmission can also have the same excellent performance as XLR.
Universal Blu-Ray Player CD – usb input will be via the Reavon UBR-X200 UHD Universal Blu-Ray Player purchased by our club with the generous assistance of Len Wallis Audio.
https://reavon.com/bluray-player-ubr-x200/
The second half of the music session is designed to help you evaluate the system with music that you are familiar with. All members and guests are welcome to offer music to share with us all. So bring along your favourite music to play on CD or usb only – no streaming or vinyl this session.
All we ask is that the music and recordings be interesting. We'll ask you to tell us a little about the artist/recording before it is played. Tracks over 6 minutes will be faded out, to give everyone a fair go. We will also have a club member act as Disc Jockey for this session.
Whether you are a novice or a seasoned veteran, you will have the opportunity to listen, learn and share your experiences with others. Feel free to come and hear the capabilities of the system, or to just share the experience with like-minded music lovers in a friendly and relaxed atmosphere.
Guests are welcome – we are a very friendly club so you don't need to know anyone to join us for an afternoon of fine music and sound.
Please bring your music to share with other club members.
Venue: Mathews Room, Epping Creative Centre, Dence Park
Address: 26 Stanley Road, Epping
When: Sunday 21st January 2024.
Doors open from 1.00 pm to meet and chat with members.
Meeting finishes at 5pm with an afternoon tea break.
It is a requirement of entry that you sign-in in the visitors’ book. You are not required to wear a mask but you may wish to do so.
Hope to see you there on Sunday 21st.
John McEvoy
Meeting Co-ordinator
Sydney Audio Club Inc.
W: http://www.sydneyaudioclub.org/
FB: <https://www.facebook.com/sydneyaudioclub>
The first Club meeting for 2024 will be held on Sunday 21st January with a presentation of some classic vintage equipment from the vast treasure trove of resources of members Paul B, Ian R and James L. Come and hear how the classic vintage sound can compare with more recent equipment. The doors will be open from around 1.00 pm to meet and chat with members before the meeting starts at 2.00 pm.
There will be no Techtalk this month.
Guests are welcome – we are a very friendly club so you don't need to know anyone to join us for an afternoon of fine music and sound.
Details of the system for January 21:
Speakers: Bowers & Wilkins DM220 from around 1984 - two pairs stacked vertically.
They are a 3-speaker 3-way sealed bookshelf design handling up to 100 Watts into 8Ω with a frequency response from 53 Hz to 20 kHz ± 3 db.
Output sound pressure level 90dB/W/m
Crossover frequency 500 Hz, 3 kHz
External dimensions Width 290 x Height 680 x Depth 320 mm
Weight 15.1kg
Two 20 cm cone type woofers are mounted in the low range and drive the band of 500 Hz or less in parallel. A fiber cone is used for the diaphragm, and high efficiency and excellent transient characteristics are obtained by driving with a strong magnetic circuit while aiming at low mass.
In addition, the roll-off characteristics of the unit itself match those of the secondary Butterworth filter, and by simply passing the secondary Butterworth filter through one stage, the characteristics of the fourth Butterworth filter (24dB/oct) are reasonably realized. This gives ideal slope characteristics, and by realizing steep attenuation characteristics at the crossover point, interference to the high range of the woofer is effectively suppressed.
A 2.6 cm soft dome type tweeter is installed in the high range.
The diaphragm is made of polyamide film, which has high internal loss and low high-frequency resonance, enabling natural and accurate high-frequency reproduction.
https://audio-database.com/BandW/speaker/dm220.html
Amplifier: We have two amplifiers to choose from and possibly compare.
Audiolab 8000P Stereo Power Amplifier
Power output: 100 watts per channel into 8Ω (stereo)
Total harmonic distortion: 0.05%
Signal to noise ratio: 95dB
The Audiolab 8000P Stereo Power Amplifier is a vastly underated amplifier. The 8000P was loved by many but also hated by a few others. The main criticism being that it could sound a little sterile, where as those people that loved the Audiolab 8000P Stereo Power Amplifier pointed to it's excellent imaging and bass.
Pioneer SA-7500 Amplifier
Power output: 45 watts RMS per channel into 8Ω (stereo)
The Power Amplifier section uses 1-stage differential amplifiers direct coupled OCL
Outputs: A, B and A + B
The Preamplifier section Equalizer is 3-stage direct-coupled and the Control amplifier is 2-stage direct-coupled with 1 FET, NFB type.
Total harmonic distortion: 20Hz – 20kHz no more than 0.05%
This good old amplifier has independent Bass and Treble controls with Loudness, Hum and Noise filters – remember those !!
DAC: Topping D30Pro Desktop USB Balanced DAC
The Topping D30 Pro is a quad-CS43198 chipset desktop DAC with preamp capability offering up to DSD256 and PCM 32BIT/386kHz decoding
Sound of Quad DAC
The 4 x CS43198 provide a total of 8 full balanced channels. So each channel of the D30Pro will be arranged in parallel by 4 conventional balanced channels. The increase in output capability will bring changes in the sound and the spec will also improve.
USB support DSD256 & PCM384kHz high resolution audio
D30Pro uses 2nd generation 8 core XMOS XU208, USB supports up to PCM32bit 384kHz and DSD256 native.
Selectable output port
D30Pro has full balanced XLR output and single ended RCA output. You can choose "XLR only", "RCA only" or "XLR+RCA" output to meet different usage requirements.
Preamplifier function
D30Pro has a preamplifier function so you can control the output volume on the front panel and also at the remote control. Since it's noise is <0.9uVrms@SE out and <1.1uVrms@BAL out, which is significantly lower than other similar products, it is very suitable for connecting to power amplifiers or monitor speakers.
A lot of effort is used to achieve everything above CPLD focusing on clock processing and digital signal optimization, restoring what the digital signal should be. We use up to 8 independent LDOs to supply power to different loads, so there is no longer interference between different loads. Both RCA and XLR have reached the 120dB SINAD, so that RCA transmission can also have the same excellent performance as XLR.
Universal Blu-Ray Player CD – usb input will be via the Reavon UBR-X200 UHD Universal Blu-Ray Player purchased by our club with the generous assistance of Len Wallis Audio.
https://reavon.com/bluray-player-ubr-x200/
The second half of the music session is designed to help you evaluate the system with music that you are familiar with. All members and guests are welcome to offer music to share with us all. So bring along your favourite music to play on CD or usb only – no streaming or vinyl this session.
All we ask is that the music and recordings be interesting. We'll ask you to tell us a little about the artist/recording before it is played. Tracks over 6 minutes will be faded out, to give everyone a fair go. We will also have a club member act as Disc Jockey for this session.
Whether you are a novice or a seasoned veteran, you will have the opportunity to listen, learn and share your experiences with others. Feel free to come and hear the capabilities of the system, or to just share the experience with like-minded music lovers in a friendly and relaxed atmosphere.
Guests are welcome – we are a very friendly club so you don't need to know anyone to join us for an afternoon of fine music and sound.
Please bring your music to share with other club members.
Venue: Mathews Room, Epping Creative Centre, Dence Park
Address: 26 Stanley Road, Epping
When: Sunday 21st January 2024.
Doors open from 1.00 pm to meet and chat with members.
Meeting finishes at 5pm with an afternoon tea break.
It is a requirement of entry that you sign-in in the visitors’ book. You are not required to wear a mask but you may wish to do so.
Hope to see you there on Sunday 21st.
John McEvoy
Meeting Co-ordinator
Sydney Audio Club Inc.
W: http://www.sydneyaudioclub.org/
FB: <https://www.facebook.com/sydneyaudioclub>