Why does Alpine insist on having such a high impedence on their pre outs?

[nismos14 5,000+ posts]

Read my review thread that I just posted and this part

http://www.caraudio.com/forum/showthread.php?t=266406

I also find that the Audiocontrol Matrix that I originally purchased to increase the level of the 880's outputs is no longer necessary. The Eclipse has much stronger outputs with no know noise issues like the 880 has. 9887 - Although rated at only 4 volt at high impedence I must say the 9887's outputs are VERY strong. They are similar in sound to the ear to the CD7100 which claims 8v.

 

[grampi 10+ year member]

how do you ground the HU without using the factory harness? I have the same symptoms with a kenwood deck, it's probably my grounds.

I don't understand. Why would a suspect ground cause one set of pre outs to have a low output, while the other set is uneffected? That doesn't make any sense.

 

[TPABlazer 10+ year member]

Ive got an easy solution. Being an Alpine HU fan myself, and never running into this problem, trouble shoot thusly... Swap HUs with a friend right fast, and see what you get. I would wager dollars to doughnuts that you will find you have the same problem, and if you dont you know you have a faulty HU.

For sure. Or, buy some deck from a box store and try that. If it curse your probelm, you know whats up. If not, return the deck.

 

[grampi 10+ year member]

I'm replacing the HU shortly anyway. That will tell me if the problem is in the HU, or somewhere else in the system.

 

[lyttleviet 10+ year member]

75x2 is your bigger problem.

 

[whitemax 10+ year member]

Read my review thread that I just posted and this part

http://www.caraudio.com/forum/showthread.php?t=266406

I also find that the Audiocontrol Matrix that I originally purchased to increase the level of the 880's outputs is no longer necessary. The Eclipse has much stronger outputs with no know noise issues like the 880 has. 9887 - Although rated at only 4 volt at high impedence I must say the 9887's outputs are VERY strong. They are similar in sound to the ear to the CD7100 which claims 8v.

I just swapped out my CD7000 (5v's at 55ohms) and felt the exact same way. The 9887's preouts are stronger than I expected. I have not adjusted my gains at all after installing it.

 

[grampi 10+ year member]

75x2 is your bigger problem.

The 75 x 2 is going to the comps, which way outruns the sub, which is getting 300 watts. 75 x 2 is not the problem.

 

[tcguy85 10+ year member]

well if you have amps that have more power than you need, you could turn the gain down lower and still get the same or higher volume without a chance of clipping the amp.

 

[nismos14 5,000+ posts]

Regardless 75x2 should be plenty of power.

 

[SQChevy 10+ year member]

I have to ask just to be sure where is the gain on the amp at for the sub outputs? Can you turn the gain higher?