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Alcons Keeps Moscow’s CDKG on the Right Track

A total of 81 years old and as popular as ever, Moscow’s Central Palace for the Culture of Railway Workers (CDKG) plays host to a diverse array of classical and modern performances, conferences, banquets and exhibitions. And with an Alcons audio system in its main performance space, the historic building sounds every bit as spectacular as it looks.

Built by the country’s then socialist regime to provide a social focus for Moscow’s army of railway employees, CDKG has always been a highly popular venue. Recently it has undergone a major technical refit of all its facilities, bringing it up to truly 21st century standards

Carried out by the Moscow office of Russian supply and installation company LTM, the refit included the installation of a major Alcons system in the CDKG’s 800-capacity main concert hall.

Chosen for both its acoustic quality and ability to visually blend with the hall’s stunning décor, the Alcons main front system comprises 12 QR36 pro-ribbon line-source columns, each fitted with double RBN1801 pro-ribbon HF drivers and six 6.5-inch woofers; As low-mid extension six QM36 line-source fill columns are installed, each fitted with six 6.5-inch woofers, together with the QR36 forming two arrays of each nine metres tall. For the low frequency extension, 14 QB363 bass columns were used, with three 12-inch vented woofers, forming two bass arrays of each seven metres tall.
Due to the length of the arrays, the cylindrical projection behaviour (“Fresnel” or “nearfield” area) already starts at 50Hz, eliminating room modes.

Despite their length, the side-by-side flown arrays blend perfectly into the hall’s décor through the ACO colour scheme in RAL 1001 beige finish.

Also installed are five Alcons SR9 front fills with RBN401 pro-ribbon HF driver with 2 x 5” woofers, the entire system being powered by ten ALC4-ST 2 x 2250W and one ALC2-ST 2 x 1.050W amplifiers. System control is by 11 Alcons 24 bit, 96 kHz Digital Drive Processors.
“Alcons equipment was chosen because the hall is 16-18m from front to back, but around 26m wide, with most of the parterre seats beneath the balcony,” says Andrey Zhelamski, pro audio manager at LTM. “Using the line-source Q series , we could avoid using speakers beneath the balcony but still provide a sound pressure of 110-112dB throughout the hall, with a variation of less than 3dB. Also, due to the line-source configuration, every person in the audience is sitting on-axis in the vertical plane with the system.”

“Further major advantages of the system are that the Q series speakers are compact and have an attractive design. Placed on the proscenium arch, they take up a minimum of space and do not impact on the aesthetics of the hall.”

Once the system had been installed and final adjustments were being made to the alignment of the loudspeakers, LTM was asked to demonstrate the system to CDKG staff and a number of leading Moscow sound engineers. Using a CD by US funksters Earth, Wind & Fire, LTM’s engineers were able to prove that the Alcons system is funky in every sense of the word!

“Everyone who heard it was really surprised and pleased that the system produces clear sound at any volume, without any distortion,” Andrey concludes.

“They were even more surprised that, when we turned on the eight wireless microphones and six hanging mics we have installed in the venue, there was no feedback whatsoever. Feedback is always a problem in such situations when using compression drivers, so it has further increased the respect for the Alcons brand in all those who were listening.”





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