Hi, All,

I have a couple questions related to the internal subwoofer crossover(?) of the Alpine CDA-105. So far, Alpine Tech support

and Crutchfield "advisors" have been unable to help -- they only know what's in the manual, which I am perfectly capable of

reading myself!

1) Does the High Pass Filter function (60/80/100 Hz or off) affect only the front and rear line or speaker outputs, and NOT the

subwoofer output? I would assume only the front and rear line or speaker outputs would be filtered, but, the manual does

not clearly specify.

(See page 14 of the manual.) http://support.alpine-usa.com/products/documents/OM%20CDA-105_EN.pdf

2) Assuming my above assumption is correct, when using the subwoofer crossover in the CDA-105 without an external

processor, the HPF (High Pass Filter) frequency of the front / rear outputs (line or internal amplifier outs) can

be set at 60 Hz, 80 Hz, 100Hz,or OFF (flat). (See page 14 of the manual*.) Is the top end of the subwoofer output (rca jacks)

LPF (Low Pass Filter) then automatically set at the same filter frequency as whatever the HPF is set at? If not, what is it set

at, or can it be changed?

*The info. on pages 27-33 is more thorough, but refers only to use of the PXA-H100 external processor.)

I do have access to a CDA-105 and could test it myself, but it's 90 miles away. It's not an extra trip I want to make / time I want

to spend, unless I have to. The above seem like a very basic questions, so I almost have to think Alpine simply made an

omission in the manual. But, no-one seems to know the answer...

Thanks!

Ok, I tried Alpine again and got a pretty knowledgeable tech. So, in case anyone else runs into these

questions, here's the scoop (from my e-mail to my friend who'd actually purchased the CDA-105;

slightly edited to make more sense, here):

The good news: The Alpine CDA-105's speaker outputs and line level

(RCA) front & rear outputs CAN be set internally to knock off the bass

below 100 Hz, to run basically as mid / highs, as we discussed. So,

basically I change a setting in the head unit's menu, to accomplish the

crossover, and we do not have to rewire between the head unit and the

existing 6 1/2" speakers.

Also, the setting / filter that does the above does not affect the subwoofer

output. (It seemed extremely unlikely that it would, but I figured I'd ask.)

The "bad news" (only a little bit bad): The "subwoofer" output on the Alpine

(intended to feed an amp that powers subwoofer or subwoofers) does NOT

knock off the mid / high content. It is a full-range output.This surprises me

a bit, but I guess they had to save a buck. Maybe they did not want to have

to include filter options to match the various settings of the High Pass Filter

on the mains (as discussed above.)

What this all means is that I'll need to find an inexpensive amp with a built-in

subwoofer crossover, rather than sell you the one I have on hand. (Darn!)

However, it will not be too hard to find an amp. I'll do a little hunting, pronto.

Hi, All,

I have a couple questions related to the internal subwoofer crossover(?) of the Alpine CDA-105. So far, Alpine Tech support

and Crutchfield "advisors" have been unable to help -- they only know what's in the manual, which I am perfectly capable of

reading myself!

1) Does the High Pass Filter function (60/80/100 Hz or off) affect only the front and rear line or speaker outputs, and NOT the

subwoofer output? I would assume only the front and rear line or speaker outputs would be filtered, but, the manual does

not clearly specify.

(See page 14 of the manual.) http://support.alpine-usa.com/products/documents/OM%20CDA-105_EN.pdf

2) Assuming my above assumption is correct, when using the subwoofer crossover in the CDA-105 without an external

processor, the HPF (High Pass Filter) frequency of the front / rear outputs (line or internal amplifier outs) can

be set at 60 Hz, 80 Hz, 100Hz,or OFF (flat). (See page 14 of the manual*.) Is the top end of the subwoofer output (rca jacks)

LPF (Low Pass Filter) then automatically set at the same filter frequency as whatever the HPF is set at? If not, what is it set

at, or can it be changed?

*The info. on pages 27-33 is more thorough, but refers only to use of the PXA-H100 external processor.)

I do have access to a CDA-105 and could test it myself, but it's 90 miles away. It's not an extra trip I want to make / time I want

to spend, unless I have to. The above seem like a very basic questions, so I almost have to think Alpine simply made an

omission in the manual. But, no-one seems to know the answer...

Thanks!