A White Paper Of The Installation Series Loudspeakers YAMAHA CORPORATION PA·DMI Division, Advanced System Development Center
A White Paper Of The Installation Series Loudspeakers We made the simple test for measuring the phase 1 Introduction characteristics using two 2-way speaker systems. The ease with which a speaker system can be adjusted to match the characteristics of a facility is of the utmost importance to sound contractors and engineers.
A White Paper Of The Installation Series Loudspeakers Yamaha thought that "even if different speaker Phase models are used in a system, we should offer a 180 150 "white canvas" and paid attention to the phase 120 Phase [Degree] 90 characteristics, aiming for the unification of the 60 30 0 phase characteristics through the series.
A White Paper Of The Installation Series Loudspeakers 1) About phase characteristics between drivers Even a single speaker system may have the outLF drivers of a 2-way speaker system). Figure 4 shows the phase response of a 2-way Relative S.P.L. [dB] of-phase problem (for example, between HF and 10dB Low High Low+High speaker system. The cutoff frequency is 1.
A White Paper Of The Installation Series Loudspeakers the phase difference is within 120 degrees at 1 2) Discussion on phase response when multiple speaker systems are used kHz or less frequency. It is thought that, under this amount of phase difference, interference For installation to a hall, theater, church, etc., can be ignored. Therefore, in this condition, it multiple speakers may be stacked in arrays.
A White Paper Of The Installation Series Loudspeakers affected by the dip caused by the interference θ 5 10 15 20 L=6 m 0,087 / 4.336 Hz 0,174 / 2.170 Hz 0,261 / 1.449 Hz 0,347 / 1.089 Hz L=12 m 0,087 / 4.332 Hz 0,174 / 2.168 Hz 0,261 / 1.448 Hz 0,347 / 1.088 Hz L=24 m 0,087 / 4.331 Hz 0,174 / 2.167 Hz 0,261 / 1.447 Hz 0,347 / 1.088 Hz expands, as well as the dip frequency lowers. When the phase difference is 90 degrees, if θ is 15 degrees or less, the level difference at 1kHz or below is within 3 dB.
A White Paper Of The Installation Series Loudspeakers For designing the "Installation" series speakers, Phase 90 degrees Yamaha focused on this point and considered it 5 very important to match the phase Relative S.P.L. [dB] 0 characteristics not only between the same -5 speaker models but also between different -10 deg deg deg deg deg deg deg -15 -20 0 5 10 15 20 25 30 models.
A White Paper Of The Installation Series Loudspeakers - Same phase characteristics between passive and bi-amp models with the same enclosure. - Same phase characteristics between highpower and middle-power (will be available in the autumn of 2005) models with the same enclosure. - Same phase characteristics between different enclosure models. - The phase difference between speakers at 2 kHz must be within 90 degrees.
A White Paper Of The Installation Series Loudspeakers characteristics of the two drivers, the phase network circuit sounded better. difference is 360 degrees.
A White Paper Of The Installation Series Loudspeakers - Non coloration sound regardless of the total (3) Minimizing the electronic compensation level The equalizing operation compensates the - Same timbre at any position within the amplitude response; on the other hand it causes directivity range deterioration of the phase characteristics. The - Adequate audio image size of each source more you compensate the amplitude response, the more the phase changes.
A White Paper Of The Installation Series Loudspeakers 4. Designing and developing style well as giving listening tests to check clearness, resolution, audio image size, etc. The horn with 1.4-inch throat used for 15-inch Designing, as well as developing a prototype, and 12-inch models improved sound was made in three separate stages. penetration and resolution. This is the In the first stage, Proto 1 for the first sound maximum size horn that can be fitted in the evaluation was developed.
A White Paper Of The Installation Series Loudspeakers The magnetic circuit uses a large ferrite magnet For the low-frequency network of the 15- and for enhancing the magnetic density, resulting 12-inch models, a coil binding 15-gauge copper clear and crisp sound. wire to the large silicon steel plate core and a large film capacitor with small Tan θ, ensuring - Enclosure the high resolution sound even at high power After the listening tests, we decided to use 11- input.
A White Paper Of The Installation Series Loudspeakers YAMAHA INSTALLATION SERIES Competition model Comparison between different directivity patterns Comparison between different directivity patterns Orange: IF2115/64/bi-amp Blue: IF2115/95/bi-amp Orange: Competitor’s 15” LF 2way 60x40 bi-amp Red: IF2115/99/bi-amp Green: IF2115/AS/bi-amp Blue: Competitor’s 15” LF 2way 90x50 bi-amp Comparison between different drive modes Comparison between different
A White Paper Of The Installation Series Loudspeakers EQ are used. However, we believe that the Yamaha 6. Summary "DME24N/64N" are the best combination in terms In the autumn of 2004, we invited the estimators and had the meeting at "Audio Composite Engineering" for evaluating the tone quality of the final prototype. Using CDs and microphones that were brought by estimators, evaluation was carefully made. The meeting finished amid a storm of applause. of tone quality.
