i posted a while ago asking which alpine head units offer a completely active crossover ? (for tweeters as well). i think it was shinycar that suggested it's all the models with 'bass engine pro'

anyway i just wanted to ask, can the crossover'd signal be sent out to the speaker level outputs or do they have to go straight to the RCAs (amp) ?

I know on mine (9835) they can while in 2-way mode, not sure about this years models. Or about 3-way mode (i'd assume they didnt)

on my 9815, you can hp/lp the speaker outputs. don't think it'll bandpass on the speaker outputs though (not sure).

if you want fully active (i.e. tweet, mid, subwoofer) as far as i'm aware you'll need to use the RCA's.

(not sure why you'd go active off the internal hu amp anyway???)

- Stooge007 out

yes bass engine pro is the feature that you need

3 way pro mode

tweeter, midbandpass, sub (but no subsonic filter)

7998, 9815, 9835, 9855 definitely have this feature

you can register with alpine and look @ the members section for the full owners manual for the headunit you are interested in :-)

can anyone give us a rough idea on the differences between the 7998, 9815, 9835, 9855 ?

http://www.alpine.com.au/products/techSpec.pdf

There you go

Note that units like the 7998r have no internal amps, so may not be what you're after...

as far as x-over with the internal amp...not sure ask shiny about that one

ive only used the 7998 & 9815 with rcas, never used the internal amp with the 9815

7998 has RCA output only and non detachable face plate.


as far as the 9815, 9835, 9855 i think they are basically the same headunit, except for the face plate.

if you want to run active i would ONLY use an extrenal amp. WIth about 16watts rms per channel i wouldnt even bother trying to run active via the headunits internal amp. Just use the passive x-over that are supplied with the speakers. Just remember the biggest destroyer of tweeters and mids is clipping.

save up use any of the bass engine pro headunits and get a 5 channel amp or 4channel + sub amp

good luck

As far as i'm aware, the 9855 is an inferior build to the 9835.

I'm thinking he wants to know about crossovers on the internal amp so he can easily run a set of ambient tweets off the hu?

probably a matter of opinion. old-skool users dislike the 'glide touch' feature, but new users no doubt find it easy to use. i think the build quality remains excellent for the money (although i've only toyed with the new ones on demo boards).

9835 is the older model version of the 9855.
After owning both (and currently still own 9855)

I prefer the 9855 menu's and quite enjoy the ease of the glidetouch controls.

The 9855 crossover section affects the internal amp outputs as well as the RCA preouts. so if you use it in 3 way mode you get tweeter and midrange out from ofront and rear ouotputs...

thanks everyone,

pyroay, you reakon if u put the head unit in three-way mode head unit power will be affected (1+2 highpassed, 3+4 lowpassed)

I know that is the case as it happend to me.

I wanted to run Lisa's system active using the 3 x RCA's pre out + use the headunit powered rear speaker to run rear fill.
When they came on they were playing midbass frequencies. When i change the crossover on the headunit they also change.

I changed them to the front powered outs and they were playing tweeter frequencies.

Isn't that exactly what's meant to happen when you put it in 3-way mode? Instead of having Front, Rear, and Sub you get Front High, Front Mid, and Sub. I might be missing something but I don't see why the HU's internal amp would be immune to crossover change. If you want rears and to actively crossover, then you'll need external processor to actively crossover the fronts, not using the HU in 3-way. If this is incorrect I'd love to know how it works:)

I have had active 2 way front stage, CDA-9815 in 2-way mode, using MRV-f540 to actively crossover the fronts, and thus retaining rears.

Its not an issue in my case as i'm now not running rears anyway i was usng it to illustrate the point about the crossover thuogh.

pyro

was the head unit in pro 3way mode for this

if so then we can assume the inboard amp is also directly affected by the x-over setting

tweeter = front
band pass mid = rear

rca sub out for sub

yes in 3 way pro mode...