Grimm Audio LS1 User Manual Download

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Table Of Contents

Welcome / Overview

The Acoustics / The Electronics

Positioning

LS1s - Subwoofer

Unpacking And Assembly

Hardware Control Settings

Hardware Remote

Software Control Settings

Connectivity

Setup Examples

10. Table Of Contents / Notes

11. Technical Specifications

12.

Warranty Information

page 5

page 6

page 8

page 12

page 14

page 24

page 26

page 32

page 46

page 54

page 58

page 60

page 61

page 58

Summary of Contents for LS1

Page 1: ......

Page 2: ......

Page 3: ...DRIVEN TO IMPROVE ...

Page 4: ......

Page 5: ...fact we perform part of these measurements as a standard routine during production so the response of your LS1 loudspeakers has also been individually measured and corrected By integrating top quality digital signal processing converters and amplifiers in one of the speakers legs we were able to apply technical strategies no one had used before As a consequence the LS1 is not just a loudspeaker bu...

Page 6: ...ves the lateral resonance inside the box signifi cantly above the cross over frequency of the low frequency driver This avoids boxiness before any electronic correction is applied Next step in the design phase was the driver selection We settled on an outstanding pair of Seas units The tweeter s exceptionally low distortion in the mid range allows a fairly low cross over frequency that benefits ve...

Page 7: ...the three way at 20 Hz Digital input signals are re clocked by a state of the art ASRC circuit which is based on the same oscillator as the legendary Grimm CC1 clock Analog inputs are first converted to digital with a high performance A D converter The signal then enters the DSP which has a data path of 48 bits wide with a 76 bit accumulator Each driver then has its own high quality D A converter ...

Page 8: ...reflections on the wall behind the listener tend to have more impact than with other loudspeakers Please consider to add absorption or sound scattering objects like bookcases against this wall First reflections also introduce phase distortion in the early sound if the walls are too close Psycho acoustics tells us this effect is important down to 250 Hz The period of a 250Hz tone is 4ms and sound t...

Page 9: ...he position of the source and of the listener So again it makes sense to spend some time positioning the LS1 s carefully to find the optimal compromise Consult a specialized acoustician if you have a real strong room mode problem in your room Some companies apply DSP for room correction We rather not use DSP in the LS1 for this since the effects are influenced by the position of the listener If we...

Page 10: ...nd of the room sound In fact strange at may seem you can hear these effects too when speaking yourself at the loudspeaker positions The LS1 cabinet is wider than usual so the effect of turning the loudspeaker around its vertical axis is larger than you would expect We can use this to our advantage since the off axis response of the LS1 is extremely even The LS1 sounds just as good slightly off axi...

Page 11: ...alled cone break up The Seas woofer we selected has a very high break up frequency of 4 kHz This is far above the cross over frequency of 1 5 kHz so the in band sound is not affected by it A loudspeaker however is never free of distortion The third harmonic of 1kHz is at 4 kHz and this distortion component will be amplified a bit by the cone break up Since 4 kHz is a very high frequency for a larg...

Page 12: ...ar and have to produce only very low sound pressure levels to generate a subjectively impressive bass response A speaker in a room on the other hand has to move some serious air volume in order to generate the same subjective impression for the listener So the quieter we listen and the less sound pressure level is required the less air volume a driver has to move so it can be a smaller diameter an...

Page 13: ... Peerless has a very long linear excursion which moves an equal amount of air like a large surface woofer The LS1 s have a dedicated subwoofer output which can be controlled from within the remote software While it is possible to connect any subwoofer to this output the optional LS1s low frequency extension provides a different degree of integration With the LS1s added the LS1 effectively becomes ...

Page 14: ...page 14 U Unpacking and Assembly ...

Page 15: ...The open transport package should look somewhat like in this pictures on the left please take out the accessory box the CAT5 cables both speaker cabinets and the extruded aluminium profiles which for simplicity from here on shall be called legs The next step is to unscrew the footplates from the transport package but be careful those are really heavy page 15 ...

Page 16: ...page 16 Unpacking and Assembly U ...

Page 17: ...electronics to face the front side of the speakers now is the time to simply swap the legs The multipin connector that is used to connect the speaker cabinet to the electronics contained in the leg can be pulled out of either side of the bottom aluminium profile attached to the cabinet So the choice is yours where to put the active leg Very Important Every speaker is individually measured during m...

Page 18: ...page 18 Unpacking and Assembly U ...

Page 19: ...ry strong magnets Keep them far from anything sensitive to magnetic fields Please secure the connection of the legs and cabinet by fitting the knurled screws found in the accessory box on the top part of the inside of the legs Screw them in but don t tighten them completely yet so we can still allign all the edges exactly by hand later on once the LS1 are in place because we also want them to look...

Page 20: ...page 20 Unpacking and Assembly U ...

Page 21: ...up the speakers it does make it much easier The footplate is now mounted with the four hexagon socket screws found in the accessory box as is the matching Allen key Please only tighten those gently there is no need to torque them down too hard page 21 UnpackingAndAssembly Unpacking And Assembly ...

Page 22: ...Unpacking and Assembly page 22 U ...

Page 23: ...and These steps can now be repeated exactly with the second speaker In the next chapter we will have a look at all the connections and peripherals Now you can carefully set up the assembled LS1 as mentioned asking a second person to help you is highy recommended Best is to directly place the LS1 close to the right spot in the room If you are on your own the easiest way to carry the speaker is to s...

Page 24: ...Hardware Control Settings page 24 H ...

Page 25: ...ion of this switch has no influence whatsoever on all the digital inputs Channel Switch Chnl If a digital input is used while there is no connection to the remote software this switch chooses manually if the left or right channel of the stereo aes spdif signal is played back on the respective speaker Attention The settings of the mac pc remote software always have the first priority As soon as the...

Page 26: ...Hardware Remote page 26 H ...

Page 27: ...This means you can have all possible kinds of audio sources permanently connected Switching between the sources can be done via the remote software see next chapter or via the hardware remote that is included in the hi fi package This is not only convenient it completely eliminates the need for a classic hifi preamp in the system which is a wonderful thing We all know that sometimes classical hifi...

Page 28: ...Hardware Remote page 28 ...

Page 29: ...software settings by pressing it again the mode is deactivated The preferences of the remote software allow the choice either a complete mute of the signal a dim attenuation of the signal by 10dB or a dim attenuation of the signal by 20dB The dim function can be handy if you want to talk or answer the phone for example without stopping playback of the music 3 Switching between input sources If you...

Page 30: ...for Extra Settings Now you are in programming mode and you can release the dial The display will show the control to be programmed The first control is bri or the brightness of the display Alternating it shows the current setting By turning the dial you can change this setting The next menu item is selected by pressing the dial once more You will then see CAL This calibrates the 0 0 volume point o...

Page 31: ... setting by pressing the dial briefly This setting shows BuT and lets you select the press function for the button dial either mute or dim d Next setting after pressing the dial is dis or display The options here are vol off and inp which means you can choose if you want your display to show the volume be off or show the input when you are not actively using it Pressing the dial now moves you to t...

Page 32: ...S Software Control Settings 1 2 3 4 5 6 7 page 32 ...

Page 33: ... into the middle position again 4 The swap button swaps the left and right speaker channels If you want to permanently swap those there is a setting in preferences under the LS1 tab instead 5 The offset dial allows for different level offsets for each selected source individually which makes it easy to calibrate your different input sources to one common matching volume setting 6 This is the volum...

Page 34: ...S Software Control Settings 8 9 10 12 11 13 page 34 ...

Page 35: ...tems For your home listening pleasure you want to make sure that this button is off 12 The Mono function sums both sides of the stereosignal into one mono signal which is then played back identically and at equal level on both speakers If you want to listen to a real mono source you can additionally press either the L or R button in the mute section and mute one of the speakers You will now hear b...

Page 36: ...S Software Control Settings page 36 ...

Page 37: ... to unintentionally have changed those settings you can use the Restore default button to reset them anytime The default 0 level is equal to the international reference used for movies Normal mastering levels for nineties pop music are 6 dB higher and should normally be played at a 6 position Technically speaking a reference noise of 20 dBFSrms gives an acoustical level at the listening seat of 85...

Page 38: ...S Software Control Settings page 38 ...

Page 39: ...e it was done with analog systems we now have the possibility to simply control the maximum possible excursion of the driver This means as long as the excursion limiter does not come into action which will be indicated by the LED inside the LS1 blinking there is no audible effect of this protection circuit happening to the signal whatsoever For hifi use you may safely turn off the excursion limite...

Page 40: ...S Software Control Settings page 40 ...

Page 41: ...respon ding setting here Analog reference level this sets the gain for the analog inputs on both speakers Low cut frequency this adjusts how low the LS1 will play when used as a two way system without sub The LS1 will be completely linear down to 25Hz even as a two way system without the subwoofers Choosing a low cutoff frequency will however limit the maximum playback level In practice 38Hz to 40...

Page 42: ...S Software Control Settings page 42 ...

Page 43: ...r updated Firmware update starts the update procedure for the chosen speaker Warning Before starting a firmware update please take care of the following precautions 1 Stop all music playing 2 Do not touch the hardware remote during the firmware update process 3 To be safe it is best to connect just one LS1 at a time to the USB interface and remove the hardware remote when using the Firmware update...

Page 44: ...S Software Control Settings page 44 ...

Page 45: ...gain setting of the sub woofer Remember the crossover is at 70 Hz so this gain control works like a low shelf eq Usually 0 is correct Delay The optimum is dependent on your acoustics but 0 would normally be good To find the optimum setting switch between no sub and Grimm sub and play with the delay setting until the Grimm sub selection offers at least the same amount of punch as the no sub setting...

Page 46: ...Connectivity XLR female XLR female CAT 5 XLR male power page 46 to Mac PC to Hardware Remote ...

Page 47: ...h the left speaker so we connect the To LS1 control in with the digital in 2 control in of the left speaker via the CAT5 cable 3 The supplied usb cable is connected between the usb interface and a free usb port of the mac pc that has the LS1 remote software installed 4 Now we connect the left and right speaker with the second CAT5 cable going from the digital thru control thru output of the left s...

Page 48: ...Connectivity page 48 CAT 5 USB CAT 5 XLR male XLR female XLR female CAT 5 CAT 5 XLR male power ...

Page 49: ...l not be used in a hifi setup In a studio situation this output provides the digital AES EBU that is selected from the input sources to be looped through to a digital audio meter or spectrum analyzer 9 All that is missing now is some music So let s have a look at the different input source options In the picture to the left you can see the different connector types used XLR male female Used for sy...

Page 50: ...Connectivity page 50 ...

Page 51: ...pplied adapter cable which takes care of the impedance matching inbetween those The hardware remote has two additional digital inputs on the backs This keeps cable connections short and tidy as the remote can be put right next to the source The music and control signals can then be transmitted to the LS1 via the single CAT5 cable 3 The usb input The computer will recognize the Grimm Audio usb inte...

Page 52: ...Connectivity page 52 ...

Page 53: ... of the subwoofer Unlike with the two way system the powercable is now plugged into the subwoofer Please use the short male to female power cable that we supply with the LS1s to connect power from the LS1s power outlet to the LS1 The power switch on the LS1 electronics can now always be left on and the complete system is powered on off via the power switches on the subs You can see how this is don...

Page 54: ...then transmitted to the LS1 via the CAT5 cable you now have convenient control of the playback volume via the hardware remote The digital S PDIF output of a cd player or cd transport is connected to the digital input on the left speaker via the supplied adapter cable The hardware remote is connected to the LS1 via CAT5 but only transmits control signals which enables convenient control of the play...

Page 55: ... Interface in the audio tab of the system preferences of Mac OS X The Mac Mini e g is connected to the usb interface via usb The hardware remote controls the actual dsp inside the speaker and thus allows for a completely transparent volume control The Mac Mini and your playback software of choice can be controlled via the Apple Remote app via an iPhone iPod Touch or an iPad Don t forget that you c...

Page 56: ...sp inside the speaker and thus allows for a completely transparent volume control The digital S PDIF output of a media server Sonos Logitech Squeezbox or others is connected to one of the two digital inputs on the hardware remote via the supplied adapter cable The volume can now be conveniently be controlled via the hardware remote the volume control inside the media server can remain unused Don t...

Page 57: ...rder to listen to your beloved vinyl collection the analog outputs of your phonostage can of course be connected to the analog inputs on the LS1 with the help of RCA to XLR adapter cables Please refer to the chapter Hardware Control Settings for correct level matching of the analog inputs of both speakers The hardware remote is connected to the LS1 via CAT5 but only transmits control signals which...

Page 58: ... 1 Unpacking And Assembly 5 Hardware Control Settings 6 Hardware Remote 7 Software Control Settings 8 Connectivity 9 Setup Examples 10 Table Of Contents Notes 11 Technical Specifications 12 Warranty Information page 5 page 6 page 8 page 12 page 14 page 24 page 26 page 32 page 46 page 54 page 58 page 60 page 61 page 58 ...

Page 59: ...Notes page 59 ...

Page 60: ...Linkwitz Riley 3 way system sum corrected to minimum phase in normal mode not corrected in low latency mode Level The default 0 setting of the LS1 remotes volume setting gives 85 dBC at the listening position with a 20 dBFS reference noise which is the movie theatre calibration or K20 Latency 7 3 ms 2 way 40 ms 3 way 5 ms in low latency mode Current drawn from USB 250mA Maximum allowed USB cable l...

Page 61: ...aid insured and properly packaged Proof of purchase must be presented in the form of a bill of sale or some other positive proof that the product is within the warranty period Grimm Audio reserves the right to update any unit returned for repair Grimm Audio reserves the right to change or improve design of the product at any time without prior notice This warranty does not cover claims for damage ...

Page 62: ...Grimm Audio Strijpsestraat 94 5616 GS Eindhoven The Netherlands info grimmaudio com www grimmaudio com Grimm Audio LS1 Manual English Version 2 2 ...

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