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Old 30th April 2018, 14:52   #826
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Re: Queries in 'Ask the gurus' section

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Originally Posted by bharatbits View Post
Given that speakers are such delicate items - is it fine to shut car doors when the music system is on especially in cars like Fiat, VW whose doors shut with a loud thud. I am a novice in this area. Pls share your views.
What makes you say that ?
Arent your car speakers playing when you drive on our Indian roads ?
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Old 30th April 2018, 15:07   #827
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Re: Queries in 'Ask the gurus' section

I am repeating my question once again here. To drive two 4 ohm DVC subs (RMS 300 W and Max 600 W), can you guys suggest good mono amp within 15k to 18k budget. What should be power output required from amp at 1 ohm load.
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Old 7th May 2018, 16:51   #828
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Re: Queries in 'Ask the gurus' section

hi guys,
I have a 2009 i20 Asta CRDI . The stock speakers in the car are kind of sounding broken now and I want to replace them. Note that I'm not looking to put in a new amp or any new HU hardware. I kind of want a drop-in replacement for all 4 speakers.

Can someone tell me the specs so that I can google for them and buy replacements ? I'm very confused on what kind of speakers they are and what their sizes are.
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Old 11th May 2018, 11:56   #829
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Re: Queries in 'Ask the gurus' section

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Originally Posted by navin View Post

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Hi Navinji,
I am facing a problem. There is noticable lag from subwoofer in the trunk for particular fast songs and it is annoying after certain limit of time. Same songs play nicely at home theatre without any issue.
I played with time alignment settings on HU. Front right speaker kept to distance 0, subwoofer TA set to farthest distance available. Played with position of sub in trunk. Still there is lag although marginal improvement observed with these settings.

My questions are :
1. Currently no monoblock for sub, Will adding mono amp resolve/ minimise issue?
2. I have underseat sub with me, installing it in addition to trunk sub will be any benefitial?
3. If I run a pair of subwoofers in the trunk, will it minimise the issue?
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Old 11th May 2018, 14:05   #830
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Re: Queries in 'Ask the gurus' section

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Originally Posted by Alfa_Romeo1 View Post
I am facing a problem. There is noticable lag from subwoofer in the trunk

I played with time alignment settings on HU. Front right speaker kept to distance 0, subwoofer TA set to farthest distance available
My questions are :
1. Currently no monoblock for sub,
What amplifier is driving the subwoofer?

It is easier to set up one subwoofer than 2, so unless you can set up one subwoofer well, you don't need add a second subwoofer.

What is the max time (or distance) settings you have on the HU?
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Old 11th May 2018, 14:36   #831
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Re: Queries in 'Ask the gurus' section

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Originally Posted by navin View Post
What amplifier is driving the subwoofer?

It is easier to set up one subwoofer than 2, so unless you can set up one subwoofer well, you don't need add a second subwoofer.

What is the max time (or distance) settings you have on the HU?
1. Pioneer GM-D8604 (Four channel amp), two channels bridged to run a subwoofer.

2. OK. I will keep aside this idea.

3. 350 cm. (Pioneer MVH-A209VBT)
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Old 11th May 2018, 15:44   #832
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Re: Queries in 'Ask the gurus' section

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Originally Posted by Alfa_Romeo1 View Post
1. Pioneer GM-D8604 (Four channel amp), two channels bridged to run a subwoofer.

2. OK. I will keep aside this idea.

3. 350 cm. (Pioneer MVH-A209VBT)
The amp is fine. 3.5m between the front door and the trunk should be plenty.

I suspect the box for the subwoofer is not the right size (might be a bit small). That might be causing a "bass overhang".

The real challenge is that very, very, rarely do the published specifications exactly meet the real specifications. Is there any way that your installer has a bigger box and can try the woofer in a bigger box?
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Old 11th May 2018, 21:55   #833
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Re: Queries in 'Ask the gurus' section

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Originally Posted by navin View Post
Is there any way that your installer has a bigger box and can try the woofer in a bigger box?
I will surely check this and update you. Thanks for the tip.

Today evening I just checked with TA set for front both (instead of front right), lag reduced by significant margin however it still doesn't sound perfect. With TA set for Front right, bass comes nicely from dashboard whereas when TA set for front both, bass can be felt all over the vehicle.
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Old 12th May 2018, 11:49   #834
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Re: Queries in 'Ask the gurus' section

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Originally Posted by Alfa_Romeo1 View Post
With TA set for Front right, bass comes nicely from dashboard whereas when TA set for front both, bass can be felt all over the vehicle.
Which way is the subwoofer facing in the trunk?
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Old 12th May 2018, 12:02   #835
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Re: Queries in 'Ask the gurus' section

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Originally Posted by navin View Post
Which way is the subwoofer facing in the trunk?
I tried both the sides. Earlier it was rear facing, currently kept front facing just touching rear seat.
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Old 12th May 2018, 12:07   #836
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Re: Queries in 'Ask the gurus' section

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Originally Posted by Alfa_Romeo1 View Post
I tried both the sides. Earlier it was rear facing, currently kept front facing just touching rear seat.
Did you notice any difference between front and rear facing?
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Old 12th May 2018, 12:46   #837
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Re: Queries in 'Ask the gurus' section

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Originally Posted by navin View Post
Did you notice any difference between front and rear facing?
Yes Navinji. Sub rear facing and almost touching the rear seat sounds better.

Also phase setting on HU makes little improvement. Or doesn't, I don't know. I am confused.

However I have concluded that rear facing sub sounds better for me out of all the positions tried.
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Old 12th May 2018, 19:58   #838
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Re: Queries in 'Ask the gurus' section

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Originally Posted by Alfa_Romeo1 View Post
Yes Navinji. Sub rear facing and almost touching the rear seat sounds better. .
Bingo! Now try to get the subwoofer 180deg out of phase.

BTW any idea what the slopes of the crossover are between the subwoofer and the main speakers?
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Old 12th May 2018, 20:29   #839
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Re: Queries in 'Ask the gurus' section

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Originally Posted by navin View Post
Bingo! Now try to get the subwoofer 180deg out of phase.

BTW any idea what the slopes of the crossover are between the subwoofer and the main speakers?
Navinji, please see below settings on HU-
Front - HPF 80 Hz, -12 db
Rear - HPF 100Hz, -12 db
Sub - LPF 80 Hz, -30 Hz.

On Amp, same HPF and LPF settings for front speakers and sub. Slopes, I don't know.


For current phase setting of sub please see below image. According to me this setting sounds better to my ears. Do you want me to reverse this setting?
Queries in 'Ask the gurus' section-screenshot_20180512201141.png.


Also I had a word with installer. Next week when I visit him, I can try different sized boxes per your suggestion.

Also I am finalising blaupunkt GTA 1500D monoblock. Readily available and getting good discount too. Should I go ahead with it?
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Old 14th May 2018, 13:37   #840
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Re: Queries in 'Ask the gurus' section

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Originally Posted by Alfa_Romeo1 View Post
Navinji, please see below settings on HU-
Front - HPF 80 Hz, -12 db
Rear - HPF 100Hz, -12 db
Sub - LPF 80 Hz, -30 Hz.

Also I am finalising blaupunkt GTA 1500D monoblock. Readily available and getting good discount too. Should I go ahead with it?
There is no slope given for the Subwoofer? I prefer a steep slope (-18db/oct or -24db/oct) for the subwoofer as it then does not interfere as much with the overall sound.

Please also consider the Kenwood mono-block (I think it is called the 917D) along with the Blaupunkt.
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