I can hear the hiss from one, maybe two feet away, with an ear facing the speaker. This is with a digital input, so no signal. Gain set to maximum. My new JBL 104 on maximum gain unplugged have an audible hiss to around 8 feet.
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JBL 705P / 708P
- Thread starter watchnerd
- Start date
I can hear the hiss from one, maybe two feet away, with an ear facing the speaker. This is with a digital input, so no signal. Gain set to maximum. My new JBL 104 on maximum gain unplugged have an audible hiss to around 8 feet.
Jaimo
Active Member
Just sold my LSR308's so I can't check. If my memory serves me well, the LSR 308's hiss was a bit louder but not to the point that it was an issue. I used both speakers in a stereo configuration, sitting approx 10 feet away. @stevenswall - Are you using the monitors in a nearfield application?
I know the speaker designs discussed here are high efficiency horn/waveguide types but I still can't understand why many of these manufacturers can't seem to include a quiet amp for use in the powered types? I'm not a EE or amp designer but have run 104db La Scalas and only had noise issues with a few tube amps. My current HSU speakers use a horn on the top end, are rated at 92 db 2.83v in half space, and if I stick my ear in the horn I can just barely detect a slight hiss using my 35 yo Adcom SS amps.
I know the JBLs are very highly rated for their SQ, but having intrusive audible noise levels in 2019 is inexcusable JMO
I know the JBLs are very highly rated for their SQ, but having intrusive audible noise levels in 2019 is inexcusable JMO
Agree. The 305p, 306p and 708p all have hiss. I had to turn my 708p speakers off the other day because it was quiet in the house and I could hear them from 4 feet away and I was trying to meditate.
What about normal gain? I swear the pair my roommate just got don't have as much hiss as most monitors. Same thing with a Harman Kardon Soundsticks set. No offensive hiss. EDIT: His computer fan was obscuring it a bit. I'd put it lower than a 308, but higher than a Mackie HR824 set at halfway. All the way up, the hiss is worse, perhaps on par with a Kali IN-8.
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This is ridiculous. I'd love to be an intern for JBL or Kali and get feedback and compare their stuff to competitors, but it sounds like hiss is their last priority, or perhaps their target market doesn't care in the least.
Yes, I'd be using them nearfield, and periodically moving them to a living room for movie night.
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Half way up. Or the source all the way up, and your speakers playing at a moderate volume, then unplug the source. I'll ask my roommate to listen again when he gets home.
Would REW measurements from a UMIK help? ie: 1" , 1', 2' from horn, etc?
I consider them to be quiet, but that's with MY ears. My prior reference was a set of passive Alesis monitors with a PS Audio HCA-2 amp.
Changing the input trim to -24db with the source off makes no difference. This is just noise they make while idling. I live in the countryside, so the noise floor is extremely low. Appliance pumps and light bulb hum are the loudest things usually.
I leave my 708Ps (and other equipment) always on. Any thoughts on whether the constant hiss will reduce the lifetime of the speakers?
I can't see how that would be a issue. If it was very loud it might cause a heat buildup in the voice coils but not at these levels.
Jaimo
Active Member
No issues with leaving the 70xP's powered on except that they go into some kind of protective / low power mode after many days of no use. It took me several minutes to figure this out after I hadn't used the speakers for several weeks. The volume level was suddenly very low and the only way I could restore operation was to cycle the power.
I didn't know they have this function. Thanks for the note.
The back panel of 705s is rather warm, so usually I would turn it off after use. But I don't think there should be any problem of keeping it on all the time, as the speakers are designed to be hung on ceiling. Hard to believe people will have it on and off every time after use
Valentin R
Active Member
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This would be a great speaker to measure in the Klippel and compare it with the 305pmkii
I love my 705p
I love my 705p
Guys, Do any of your components have a trigger jack?
If so plug the speakers into one of these for $25
I use 2 of them to power my 5 power amps on/off from the pre/pro trigger.
https://www.adafruit.com/product/2935?gclid=EAIaIQobChMIi9fB2dya2gIVEp7ACh3tMQZWEAQYAiABEgJUQvD_BwE
If so plug the speakers into one of these for $25
I use 2 of them to power my 5 power amps on/off from the pre/pro trigger.
https://www.adafruit.com/product/2935?gclid=EAIaIQobChMIi9fB2dya2gIVEp7ACh3tMQZWEAQYAiABEgJUQvD_BwE
Jaimo
Active Member
Yeah but does it sound better than a regular power bank? ;-))Guys, Do any of your components have a trigger jack?
If so plug the speakers into one of these for $25
I use 2 of them to power my 5 power amps on/off from the pre/pro trigger.
https://www.adafruit.com/product/2935?gclid=EAIaIQobChMIi9fB2dya2gIVEp7ACh3tMQZWEAQYAiABEgJUQvD_BwE
