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Old 10-10-2013, 03:08 PM
BudmanV24 BudmanV24 is offline
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JL M770 Maximum Power Handling

What is the concensous on the highest rms power the m770s can handle relatively reliably?
Lets assume 120hz high pass on the amp. I'm currently running 100wrms to my cabin speakers and am not satisfied. I'm used to 200-400wrms per speaker in cars. Im thinking either 150 or 200 to the in boat speakers. Im also about to drop a pair of factory cans on the tower with m770s and was considering putting an mhd750 on them. With properly set gains and not being a bone head, but still wanting to jam out at the same time what are you guys running with success? Do I need to build my own replacement crossovers to handle this kind of power?
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Old 10-10-2013, 06:48 PM
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I have been running 3 m770's inboats off one JL m6450 ( approx 150wrms each) for two seasons. I got this idea from David at Earmark. 6 inboats total on two m6450's. They work well and I havent encountered any issues.
An mhd 750 on only two m770's is a lot of power for each of those, but used responsibly they should be fine.
My one complaint about using the mhd750 on two tower speakers is that they are operating on the same channel. Earmark David and I have had discussions about this topic, I feel that some of the audio effects are lost when only using one channel, David disagrees. I use my stereo mostly for partying on the boat (close range listening) I like the sound separation of two channels on the tower vs mono.
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Old 10-10-2013, 09:29 PM
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Originally Posted by craig3972 View Post
An mhd 750 on only two m770's is a lot of power for each of those, but used responsibly they should be fine.
bud... do you responsibly use your things???
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Old 10-10-2013, 09:26 PM
BudmanV24 BudmanV24 is offline
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Yeah, I agree. I'm not super excited about the idea of a mono amp. I've got a JL m4300 sitting on the shelf that I pulled from my boat that I could use. At 14.4v that would be 225wrms x2.
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Old 10-11-2013, 10:45 AM
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Originally Posted by BudmanV24 View Post
Yeah, I agree. I'm not super excited about the idea of a mono amp. I've got a JL m4300 sitting on the shelf that I pulled from my boat that I could use. At 14.4v that would be 225wrms x2.
Do you really sit there and listen to the stereo separation and 3D qualities of the music mix when you're skiing/boarding, talking when the music is playing, towing someone or cruising to/from the area where you'll be skiing/boarding? Really? That would make you unique. Stereo is far less important than proper balance between instruments, full-range frequency response, low noise & distortion and coverage. Mono amps work fine- just maintain proper impedance and set the input sensitivity correctly.
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Old 10-11-2013, 02:51 PM
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Do you really sit there and listen to the stereo separation and 3D qualities of the music mix when you're skiing/boarding, talking when the music is playing, towing someone or cruising to/from the area where you'll be skiing/boarding? Really? That would make you unique. Stereo is far less important than proper balance between instruments, full-range frequency response, low noise & distortion and coverage. Mono amps work fine- just maintain proper impedance and set the input sensitivity correctly.
Yes I really sit there and listen. Really. I dont even play the stereo while boarding, its too noisy with the wind and motor going. I discussed the stereo mono debate with david online and wanted to know for myself, so I hooked up the speakers in mono and in stereo and I like the stereo better while standing on the swim platform listening.

If you wanna drive around the lake with "look at me" music blasting from your tower speakers while boarding, then mono would be fine.
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Old 10-10-2013, 10:26 PM
MLA MLA is offline
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With pods side by side on a tower, stereo is lost IMO. In-boats, different story, stereo is a must.
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Old 10-11-2013, 10:19 AM
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Here's a link to an article about using mono on the tower.
http://earmarkcaraudio.com/articles/..._THE_TOWER.htm

I would rate power handling for the M770s at 175 to 200 honest watts per speaker run in the highpass mode and if run flat. There is going to be a difference in real power between a strictly regulated and unregulated amplifier. If you have the factory pods containing the forward facing lamp, a percentage of these pods are not airtight, and if not, this would have to be corrected in order for the speaker to reach its max power handling without serious risk. Pay close attention to whether you are using the 'T' (air suspension) version or 'C' (IB) version in the correct application. A single JL Audio HD750/1 is perfect for four M770s. However, that is way too much power for a single pair. This amplifier is underrated and does not lose power with a drop in voltage supply.
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Old 10-11-2013, 03:07 PM
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Quote:
Originally Posted by David Analog View Post
Here's a link to an article about using mono on the tower.
http://earmarkcaraudio.com/articles/..._THE_TOWER.htm

I would rate power handling for the M770s at 175 to 200 honest watts per speaker run in the highpass mode and if run flat. There is going to be a difference in real power between a strictly regulated and unregulated amplifier. If you have the factory pods containing the forward facing lamp, a percentage of these pods are not airtight, and if not, this would have to be corrected in order for the speaker to reach its max power handling without serious risk. Pay close attention to whether you are using the 'T' (air suspension) version or 'C' (IB) version in the correct application. A single JL Audio HD750/1 is perfect for four M770s. However, that is way too much power for a single pair. This amplifier is underrated and does not lose power with a drop in voltage supply.
David, talking about regulated vs unregulated amps...The same tech at JL that advised me against a series/parallel configuration on a jl 750/1 (because he said it creates an unbalanced distribution of power between the speakers in series) also told me that an unregulated amp would be a better choice for driving 4 tower speakers. I swear I'm not making this up. I love my current JL setup and have nothing but praise for the product. Hi reasoning was that a regulated amp would draw a battery down quicker whereas an unregulated amp would simply put out less and less power as the battery draws down. What is your thoughts on this?
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Old 10-11-2013, 04:59 PM
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Originally Posted by imyourmaster View Post
David, talking about regulated vs unregulated amps...The same tech at JL that advised me against a series/parallel configuration on a jl 750/1 (because he said it creates an unbalanced distribution of power between the speakers in series) also told me that an unregulated amp would be a better choice for driving 4 tower speakers. I swear I'm not making this up. I love my current JL setup and have nothing but praise for the product. Hi reasoning was that a regulated amp would draw a battery down quicker whereas an unregulated amp would simply put out less and less power as the battery draws down. What is your thoughts on this?
The efficiency of an unregulated and regulated amplifier of the same Class D topology are exactly the same. The regulated amplifier will deliver more power to the speakers with a lower supply voltage while the unregulated amplifier will deliver less and less power as the voltage continues to sag. Anything that delivers more output power with the same efficiency pulls more supply current. Period. Here's how silly this issue is......if you want to pull the identical current and generate the same power as the unregulated amplifier as the voltage falls off then TURN DOWN THE VOLUME JUST A PINCH.
I could understand his point when applied to a boat back in the day of the inefficent Class AB Slash amplifiers that were strictly regulated. But with the overriding Class D efficiency of 60% higher, the arguement has no real merit today.
The reason you want strictly regulated is beyond power alone. Yes, a strictly regulated amplifier is built with a power supply that is about 30% more robust. But the real benny is sound quality and headroom. When you sit at rest for a long duration and the voltage is at 12.0 versus 13.5 while running, many have experienced the sound going 'thin' and losing its 'punch'. Not so with a strictly regulated amplifier. Also, how is a fine amplifier supposed to maintain optimum performance with the solid state components operated off a supply that is deviating by +/- 10%. That's not exactly within tolerance.
If you are running the system at voltages below 11.8 V you are abusing your deep cycle batteries. Consumer deep cycle batteries don't like cycles below 50% capacity.
Don't take a fine distinction out of context. It's just one element in the big marine audio picture.
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