STJ174- My latest updates :-)

[Lafafa]

stj is very busy today...he is on a mission

@stj...yar aap thora 6.5" speakers kee bass frequencies kee tuning kero. HPF them properly...fit ho jae ga

[Lafafa]

well i guess sealing them is an easier option than

[stj174]

The Phenomenon is:

Since the speakers are installed in the parcel shelf, remember its firing in both the directions one inside the cabin and the other inside the trunk (opposite phase).

Now about the sub; since it is located in the trunk, the bass from the sub is interacting directly with reverse firing of the rear speaker.

Now we can easily match the phase of the speaker firing in the trunk with the sub, but we are not sitting in the trunk are we?

Now if we correct the phase of the sub with the rear speaker (which will be the back side of the speaker in phase with the sub) will sound right and in phase.

But the moment we turn on the front speakers, the phase of the sub will totally be the opposite for the front speakers.

The scenario will be, the front speakers and the rear speakers will be phased correctly...!!!! BUT...!! the sub will not be phased correctly. Either the sub will be in right phase with the rear speakers or the sub will only be in correct phase with the front speakers.... But not both.

Reason:

For correct phasing of rear speaker with sub... we have to adjust the phase of the sub with the opposite firing (reverse phase) of the rear speaker.

For front speakers we have to adjust the phase of the sub with the front firing (normal phase) of the front speaker.

In Short:

In the above mentioned scenario, we can only phase the sub either with the front speaker (but the phase will not be correct for the rear speaker) OR we can only phase the sub correctly with the rear speakers ( but phase will not be correct for the front speakers)

[stj174]

Solution:

Isolation of rear speaker's, reverse firing with the sub.

For that, i suggest the following solutions:
1. install the rear speakers in the rear door.
or
2. Seal the rear speaker from the back side.
or
3. Fire the sub directly in the cabin.

[Lafafa]

sir...so which of the 3 options are you going to do??

and that was an interesting and educational read. thnkx

[splfanatic]

there is also an other solution which is reverse mounting the subwoofer though its lame (H)

[stj174]

you are welcome Sir. I wud go with the 2nd option, i-e seal the rear speaker

splfanatic: hain? how is that gonna help?

[03332648155]

there is also an other solution which is reverse mounting the subwoofer though its lame (H)

or use the reverse option at da subwoofer controls from pre rite fanta?

[stj174]

Update:

Center channel installed (H)

[ShaniDK]

fanta...

[Lafafa]

sir aap tou aik aik kar kae sub kuch install kar rahe ho

how is the sound of the center channel on ur processor's mosfet output

[stj174]

jee Sir only the KRX2's are yet to be installed.

about the performance of the center channel on the DSP amp, honestly Sir better than i expected

[Lafafa]

phir kab kar rahein hain krx2s install?? those are the hallmark of ur setup...and anxiously waiting for ur review on dem

[madhouse12]

sir i didnt quiet undestand one thing. if your front n rear speakers are in phase and ur rear speaker is in phase with your woofer, how can your woofer be out of phase from your front speakers?

did you try facing the sub upwards instead of backwards? turn the hpf on on your rear speakers and make a hole in the rear parcel shelf so that some bass can enter the cabin

[stj174]

sir i didnt quiet undestand one thing. if your front n rear speakers are in phase and ur rear speaker is in phase with your woofer, how can your woofer be out of phase from your front speakers?

In Cabin:
1. Phase of your front comps is NORMAL.
2. Phase of your rear speakers is NORMAL.

In Trunk:
1. Phase of your rear speaker is REVERSE.
2. Your Sub is in trunk.

Now since your sub is in trunk you will have to correct the phase of the sub according to the rear speaker which is REVERSE PHASE since they are both directly interacting with each other inside the trunk (not in the cabin)

Understood...? OK ...

NOW forget that you have the rear speaker, you only have front comps and your sub is in the trunk.

In this case you will have to adjust the Phase of the sub according to phase of the comps which is NORMAL PHASE

Understood? OK....

Now just turn on the rear speakers and see what happens....

For the sub to match the phase with the front comps the sub phase has to be NORMAL

and

for the sub (being in trunk) to be in correct phase with the rear speaker the phase of the sub have to be changed to REVERSE.

[Lafafa]

sir...how much of your phase issue will be resolved if you face the subwoofer towards the trunk (firing towards the rear - in ur exhaust's direction??)

waisae i think the rear speakers sealing thing will work well...and even give a nice tone to ur rear speakers

[yawar538]

Man u rock. u rock, urock. I am a very big fan of each of ur systems!! Keep it up! U the MAN!!! ;D ;D

[system]

nice

[03332648155]

fanta...

Sir ji apka b ek nik bangya tha, ap shayd bhool gaye bt yahan post karna offensive hojaega

@ stj174: Sir glad to kno ur system is now getting done
Bt wht im concerned abt is u might need a mighty video cam with a mighty mic in its input to do justice wid da recording of its SQ...N guys wud need a mighty SQ home system to hear it properly and d@mn, we'v spoilt our ears listenin to SPL, ab? :o

[madhouse12]

but sir still. lets look at it this way. at a particular note, your front speaker is moving out, your rear speaker is moving out and your woofer is moving out. the woofer being in the trunk is pumping air into the trunk and hence it is supporting the outward movement of the rear speaker. if it was in the opposite phase to the rear speaker then it would be restricting the outer movement of the rear speaker.

what i suggest you do is that put ur rear speakers on HPF and do the tuning accordingly like Lafafa g said. if you can, cut the bass part from it altogether so the added effect of bass on the rear speakers is cancelled.

also if you face your woofer upwards i think this phasing issue will be solved.