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Search: Posts Made By: David Analog
Forum: Audio/Stereo 09-13-2014, 11:24 AM
Replies: 53
Views: 3,123
Posted By David Analog
With considerable ease you can take a...

With considerable ease you can take a female-to-female RCA barrel connector and short the left to right channels of the RCA input at the source end, leaving the RCA plugged into the amplifier input....
Forum: Audio/Stereo 08-28-2014, 04:37 PM
Replies: 4
Views: 297
Posted By David Analog
The JL Audio XD amplifiers are tough to beat....

The JL Audio XD amplifiers are tough to beat.
You absolutely must have a dedicated channel per each M770 in-boat speaker. So an XD800/8 would be much better. If you already have the 600/6 then add...
Forum: Audio/Stereo 08-27-2014, 09:05 PM
Replies: 9
Views: 562
Posted By David Analog
Clarion HUs really are not a regular culprit for...

Clarion HUs really are not a regular culprit for noise. There was a short term issue where the sub RCA output shields on a select model where not terminated to chassis ground which certainly invited...
Forum: Audio/Stereo 08-27-2014, 03:14 PM
Replies: 4
Views: 361
Posted By David Analog
Just being thorough. You don't want to replace or...

Just being thorough. You don't want to replace or send off for repair a HU without being certain. And a newer replacement will not interface with the changer or those specific remote controls.
I...
Forum: Audio/Stereo 08-27-2014, 10:49 AM
Replies: 4
Views: 361
Posted By David Analog
It points to the source unit (HU). Check the...

It points to the source unit (HU).
Check the supply voltage to the HU, both switched and constant.
Check the molex at the back of the HU to make sure it is secure and all pins are seated well.
Use...
Forum: Audio/Stereo 08-13-2014, 09:57 AM
Replies: 1
Views: 301
Posted By David Analog
You will need to run a dedicated switched 12-volt...

You will need to run a dedicated switched 12-volt 2-conductor fused circuit. I would not tap into the factory courtesy/step light circuit as the two functions will often be used independently.
Check...
Forum: Audio/Stereo 07-31-2014, 05:32 PM
Replies: 8
Views: 465
Posted By David Analog
For now, you only need to read DC voltage. Check...

For now, you only need to read DC voltage.
Check the voltage across the amplifier terminals (rather than the supply) and while the amplifier is under load (meaning while it is playing).
* Neg. to...
Forum: Audio/Stereo 07-31-2014, 05:22 PM
Replies: 8
Views: 465
Posted By David Analog
From your description, it appears that the...

From your description, it appears that the amplifier running the mids/highs is actually 'shutting off/turning on' per the LED indicator rather than going into the protection mode. Double check that...
Forum: Audio/Stereo 07-25-2014, 11:07 AM
Replies: 11
Views: 555
Posted By David Analog
In that case it's a good option if the kick panel...

In that case it's a good option if the kick panel is front to rear sealed around it's perimeter, and especially over the top.
Forum: Audio/Stereo 07-25-2014, 09:38 AM
Replies: 11
Views: 555
Posted By David Analog
Running a minimally damped air suspension type...

Running a minimally damped air suspension type woofer without an enclosure is like taking the shock absorbers off your car and running with just the coil springs. Lots of uncontrolled and exaggerated...
Forum: Audio/Stereo 07-24-2014, 04:06 PM
Replies: 11
Views: 555
Posted By David Analog
That is exactly why I gave you the exterior size...

That is exactly why I gave you the exterior size as it pertains to the boat so you could help yourself to a measurement.
Keep in mind that you have some latitude in the shape of the enclosure as long...
Forum: Audio/Stereo 07-24-2014, 08:30 AM
Replies: 11
Views: 555
Posted By David Analog
Yes, the XS12 works great in a ported box. For...

Yes, the XS12 works great in a ported box. For ideal results you need about 2.75 cu.ft. of external displacement for the enclosure.
Yes, the Syn4 will drive two pair of coaxials and a 4-ohm 12-inch...
Forum: Audio/Stereo 07-20-2014, 09:50 AM
Replies: 4
Views: 300
Posted By David Analog
More line voltage would help a 2 volt head piece...

More line voltage would help a 2 volt head piece even if the output was not split.

You might kill two birds with one stone by adding an EQ or variable control line driver that provides more voltage...
Forum: Audio/Stereo 07-18-2014, 12:28 PM
Replies: 14
Views: 505
Posted By David Analog
I don't think anyone indicated that a 4-inch hole...

I don't think anyone indicated that a 4-inch hole will hurt in any way or form, but being so small it just won't be enough to make a perceivable difference.
Ideally, if you have to vent a...
Forum: Audio/Stereo 07-17-2014, 09:47 PM
Replies: 14
Views: 505
Posted By David Analog
I understood exactly what you wanted to do. Just...

I understood exactly what you wanted to do. Just make sure the vent is not a tube in any way or form. It should be flat like a grill. Any depth will greatly impede flow. Plus, the vent needs to be as...
Forum: Audio/Stereo 07-17-2014, 05:24 PM
Replies: 14
Views: 505
Posted By David Analog
Jim, We may be speaking of the same thing but...

Jim,
We may be speaking of the same thing but using different language.
Let's say we have a loaded woofer enclosure within a large boat compartment, whether the port or starboard helm console or...
Forum: Audio/Stereo 07-17-2014, 03:05 PM
Replies: 14
Views: 505
Posted By David Analog
"" Jim, I completely agree with this regarding...

""

Jim,
I completely agree with this regarding the compartment vent. My reasoning might be different though. Could you explain why.
Forum: Audio/Stereo 07-17-2014, 02:00 PM
Replies: 14
Views: 505
Posted By David Analog
Correct. Two completely different principles. A...

Correct. Two completely different principles.
A bass-reflex enclosure functions based on the resistance of the small diameter and long port creating a tuned resonator.
A vented compartment should...
Forum: Audio/Stereo 07-17-2014, 09:25 AM
Replies: 14
Views: 505
Posted By David Analog
Just to add some clarity, A shallow vent like a...

Just to add some clarity,
A shallow vent like a grill is good but there should be no depth to the port.
Forum: Audio/Stereo 07-16-2014, 09:06 AM
Replies: 10
Views: 398
Posted By David Analog
All the most perceivable bass output is between...

All the most perceivable bass output is between 50 and 80 Hz. It doesn't appear that you were getting much of that range from your amp and subs. That would work both products into the ground. Also,...
Forum: Audio/Stereo 07-15-2014, 05:28 PM
Replies: 10
Views: 398
Posted By David Analog
It doesn't matter. Once you type it you can't...

It doesn't matter. Once you type it you can't take it back. Forum rules.
Forum: Audio/Stereo 07-15-2014, 03:36 PM
Replies: 10
Views: 398
Posted By David Analog
You can't bridge a monoblock amplifier. We're...

You can't bridge a monoblock amplifier.
We're only speculating that heat may be the problem so sure, you can add a fan. A floating fan mostly circulates air around the perimeter of the fan which...
Forum: Audio/Stereo 07-15-2014, 09:33 AM
Replies: 10
Views: 398
Posted By David Analog
A replacement to drive two IB 10-inch subs would...

A replacement to drive two IB 10-inch subs would be the JL Audio XD600/1.
Yes, you can get it repaired at a flat rate from a JL Audio authorized repair facility. It's usually reasonable.
That's an...
Forum: Audio/Stereo 07-13-2014, 07:18 PM
Replies: 2
Views: 195
Posted By David Analog
A good replacement in a smaller, more efficient,...

A good replacement in a smaller, more efficient, but similar in power amplifier would be the JL Audio XD400/4.
The JL Audio 4300 is an excellent amplifier. It will actually deliver 500 watts. The...
Forum: Audio/Stereo 07-11-2014, 12:39 PM
Replies: 9
Views: 454
Posted By David Analog
The Pro80s and MB8s have the same size midbass...

The Pro80s and MB8s have the same size midbass driver and same size of pod so I would use the identical highpass crossover frequency. Also, every filter has a phase rotation so ideally I would want...
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