L1 Model II

Let's talk about the L1® Portable Line Array Systems

Using proprietary Bose® technology, L1 systems combine  PA and monitors into a single, highly portable unit. The  loudspeaker can be positioned behind or to the side —and you hear what the audience hears.

Highly portable PA and monitor combined for solo performers, DJs and general-purpose use. Fixed vertical control with 180° horizontal coverage Reduced vulnerability to feedback.

Three systems to choose from (Compact, Model 1S, Model II)
Two passive bass module options (B1 or B2)
Consistent coverage and tonal balance, portability and easy setup.

Hi, I just purchased the L1 Compact 1 month ago and am really enjoying the new system. However, I've been noticing a faint hiss when whenever the L1 is turned on. I normally have the volume dial at the 12 o'clock and the hiss is noticeble when close to the speaker. When I really push the volume, to say 3 o'clock, the hissing gets even louder. The hiss occurs even when nothing is plugged in to the speaker. This is not usually a problem for loud music, but for quiet passages its not so good.

Has anyone else encountered this before? It this 'floor' noise normal for the L1 Compact?



Original Post

Hi Drew,

Thanks for joining the Community. I'm glad that you are here.

Normally, if you are not using a channel, you would turn its volume all the way off. There should be no hiss.

If you are playing music through channel two and don't have a microphone plugged into channel one, then you should turn channel one all the way off.

When you play music through channel two and you have channel one turned off you shouldn't be able to hear hiss above the sound of the music. If you do:

Try another source for the music. Perhaps run a CD/MP3 player or phone into channel two through the RCA or 1/8" jack.  Turn the volume up to around 2/3 of the full volume on the source device. Then bring up the volume on the Compact.

Do you hear the hiss above the music?


Hi ST,

Thanks for your reply. The hiss occurs even when the volume trim on both channels are turned to 0. The hiss is noticeable if no music is playing and I'm standing / sitting close to the speaker ~4 feet. it is also noticeable if the music is played very quietly and I'm close enough to the speaker.

it sounds like a faint continuous static noise. It would be interesting to see if any other L1 owners are experiencing this issue. 


Perhaps I have the answer to your problem. The hiss or ground noice is coming from the wallplug. If you change, and only have 2 prongs, instead of 3, you can hear a difference. I play keyboard with my L1 Compact, and when I push the button on my keyboard, there is only silence. I have an old Yamaha Electone D65 and there are only 2 prongs on the wallplug.

Hope this helps. From Jan - Eve.

Jan-Eve posted:

Hal lo again! Well there must be a reason why Bose have 3 prongs in the cable. Perhaps someone know whats best. From Jan - Eve.

Hi Jan,

thanks for the tip! I did some research on the 2 prong cable and read tha it can be dangerous using the 2 prong cable as it could put you at risk of being electrocuted. Don't want to take the risk of damaging the PA system or killing myself :-) looks like I'm the only one who is experiencing this hiss issue? 

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