Subject: [AUDITORY] Loud Speaker and Power Amplifyer Recomendations From: Andrew A Clark <andrew.clark@xxxxxxxx> Date: Mon, 28 Jun 2021 13:38:57 +0200--60d9b4d6_2539dfa5_193 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Dear List I=E2=80=99m looking for some advice, I=E2=80=99m trying to spec a passive= loud speaker and an amplifier for running free field EEG experiments - t= he stimuli are all speech. I would love to get a pair of Rogers LS5/9 that I used in my previous lab= , but alas my budget doesn=E2=80=99t stretch that far.=C2=A0=C2=A0The pro= blem with trying to evaluate speakers is that the published data sheets d= on=E2=80=99t ever seem to give a plot of the frequency responses.=C2=A0=C2= =A0I was wondering what other people were using or what they would recomm= end=3F My next conundrum is about power amplifiers.=C2=A0=C2=A0The old Yamaha P = series amps were really great because they had step graduated dB attenuat= ors which made calibration easy and you didn=E2=80=99t need to worry abou= t taping down, glueing or sawing off the volume knob as much.=C2=A0=C2=A0= The replacement PX series is digital.=C2=A0=C2=A0Is using a digital ampli= fier a bad idea=3F=C2=A0=C2=A0I can imagine the repeated quantisation wou= ld lead to increase in distortion. Again, does anybody have any amplifier recommendations=3F Many thanks, Andrew Andrew A Clark LiRI Lab Manager University of Zurich Linguistic Research Infrastructure Andreasstrasse 15 CH-8050, Zurich Switzerland Room: AND 2.76 --60d9b4d6_2539dfa5_193 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline <html xmlns=3D=22http://www.w3.org/1999/xhtml=22> <head> <title></title> </head> <body> <div name=3D=22messageBodySection=22> <div dir=3D=22auto=22>Dear List<br /> <br /> I=E2=80=99m looking for some advice, I=E2=80=99m trying to spec a passive= loud speaker and an amplifier for running free field EEG experiments - t= he stimuli are all speech.<br /> <br /> I would love to get a pair of Rogers LS5/9 that I used in my previous lab= , but alas my budget doesn=E2=80=99t stretch that far.&=23160;&=23160;The= problem with trying to evaluate speakers is that the published data shee= ts don=E2=80=99t ever seem to give a plot of the frequency responses.&=23= 160;&=23160;I was wondering what other people were using or what they wou= ld recommend=3F<br /> <br /> My next conundrum is about power amplifiers.&=23160;&=23160;The old Yamah= a P series amps were really great because they had step graduated dB atte= nuators which made calibration easy and you didn=E2=80=99t need to worry = about taping down, glueing or sawing off the volume knob as much.&=23160;= &=23160;The replacement PX series is digital.&=23160;&=23160;Is using a d= igital amplifier a bad idea=3F&=23160;&=23160;I can imagine the repeated = quantisation would lead to increase in distortion.&=23160;&=23160;<br /> <br /> Again, does anybody have any amplifier recommendations=3F<br /> <br /> Many thanks,<br /> <br /> Andrew</div> </div> <div name=3D=22messageSignatureSection=22><br /> Andrew A Clark <div dir=3D=22auto=22>LiRI Lab Manager</div> <div dir=3D=22auto=22><br /></div> <div dir=3D=22auto=22>University of Zurich</div> <div dir=3D=22auto=22>Linguistic Research Infrastructure</div> <div dir=3D=22auto=22>Andreasstrasse 15</div> <div dir=3D=22auto=22>CH-8050, Zurich</div> <div dir=3D=22auto=22>Switzerland</div> <div dir=3D=22auto=22><br /></div> <div dir=3D=22auto=22><span style=3D=22color: var(--textColor); backgroun= d-color: var(--backgroundColor); caret-color: rgb(0, 0, 0);=22>Room: AND = 2.76</span></div> </div> </body> </html> --60d9b4d6_2539dfa5_193--