Help with fomo - JBL 4645C Subwoofer

[g_t_r]

i have an xti 1002 on order…. let’s see if it will work out. Fingers crossed

Fingers crossed, I already have crown XLS2502 so need to deal with it. Maybe xti series will have some dedicated pre-sets, but from another angle - power is smaller in xti1002

 

[sahil fardeen]

Fingers crossed, I already have crown XLS2502 so need to deal with it. Maybe xti series will have some dedicated pre-sets, but from another angle - power is smaller in xti1002

well you can add another xls2502 and bridge each instead of running stereo, and preferably minidsp 2x4hd to apply boost…i am having a single 4645c so it makes sense for me to buy an amp with dsp…in your case minidsp 2x4hd is definitely worth the investment.

 

[sahil fardeen]

Fingers crossed, I already have crown XLS2502 so need to deal with it. Maybe xti series will have some dedicated pre-sets, but from another angle - power is smaller in xti1002

Power in xti 1002 bridged is 1000w as supposed to 1550w in xls2502. Thats only a 1.5db of difference at the most. What truly matters is the first 500w(you need double the power to get an increase of 3db in spl).
Moreover xti has all the dsp, and i guess the power figures quoted in xls are burst power whereas in xti its continous(not very sure though, i remember someone saying it)

 

[sahil fardeen]

Well i recieved both the xti 1002 and 4645C. Indeed, 4645C is a beast interms of looks.

 

[Rahan]

I remember the look of my wife we they delivered it

 

[sahil fardeen]

Pretty sure it will solve your problem. It sounds super "shy" without the correction.

Hey i received the 4645C and tested it out with the xti 1002. Applied all the filters required using dsp via pc and ran in bridge. Denon sub level set at -8db. Amazing punch.
I was able to hit the limiter(red light) in crown occasionally on some scenes so voltage is not an issue, if i am doing things correctly.
Damn but the xti 1002 doesn’t have enough oomph in subwoofer duty. It hit the limits way often and it shut down twice or thrice. I could smell some burns i hope nothing is burnt inside. I will try turning on tomorrow and see whats up. So far, not good lol

 

[sahil fardeen]

seems like i should go for xls, class D and its efficiency makes it very favourable for subs

 

[Rahan]

Weird that you hit the red with a 1.2 v ...

 

[sahil fardeen]

Weird that you hit the red with a 1.2 v ...

as i told you, my denon has good preout so that might be the case…
I had the gain knob in crown at max and denon sub level at -8db
Could hit the limiter/red way often
with the xti 1002
The scene i was testing was of john wick…the bass hit so hard momentarily and the amp shut itself down. I could smell something burnt. Now it doesn’t even power on. Makes me question about the reliability of xti series

 

[sahil fardeen]

alright bad news, the xti 1002 cooked itself to death yesterday, amazon told me they will give me a full refund.
I think it’s better to go for xls due to class D

 

[smygolf]

D-mn, it did Not see this coming.
Did you use Hiqnet when you configure it ?
And did you use the Output eq ?

 

[Rahan]

Weird to burn a pro amplifier in a domestic environment. Especially in one single day!

 

[g_t_r]

alright bad news, the xti 1002 cooked itself to death yesterday, amazon told me they will give me a full refund.
I think it’s better to go for xls due to class

Seems that xti 1002 is not strong enough to push 4645C . Were you able at least (when the amp was still fine) achieve high SPL levels and strong and deep bass?

 

[Puddingbuks]

alright bad news, the xti 1002 cooked itself to death yesterday, amazon told me they will give me a full refund.
I think it’s better to go for xls due to class D

Great idea to put such a lightweight amp to the max on a big subwoofer so now it will be shredded. Thanks.

 

[sahil fardeen]

D-mn, it did Not see this coming.
Did you use Hiqnet when you configure it ?
And did you use the Output eq ?

Yep
i applied all the recommended filters
B6, high pass and low pass
The xti didn’t have an inbuilt filter for these subs like the dsi so had to configure everything manually

 

[sahil fardeen]

Great idea to put such a lightweight amp to the max on a big subwoofer so now it will be shredded. Thanks.

lol what logic is this? i put the gain on max as my preout voltage are low. I hope, you should be knowing that the gain knobs are just input attenuators, and you could drive the amp pasts its limits even if you have the gain at half and supply enough input? and i had my denon set at just -8db to -10db in the trim level.

Lightweight amp? the xti 6002 which is the series’s top dog weighs only 12kg. This 9kg. So i dont see a big weight difference. Weight isn’t a factor to how capable an amp is. For instance the xls 2502 is much lighter than this xti but is more capable (wattage wise)

And talking about “big subwoofer” this is a high sensitivity woofer. Comparatively much higher sensitivity than most of the subwoofer drivers. “Size” in most cases the bigger the woofer the higher the sensitivity.

Sorry all of your statements makes zero sense.

 

[sahil fardeen]

Weird to burn a pro amplifier in a domestic environment. Especially in one single day!

Yes. I bet this issue is confined to this unit. I don’t know why the amp didn’t protect itself from death. They must have some sort of protection…or no?

 

[sahil fardeen]

Seems that xti 1002 is not strong enough to push 4645C . Were you able at least (when the amp was still fine) achieve high SPL levels and strong and deep bass?

The bass was strong. Very strong. But yeah i did hit the red limiter. And the woofer did move quite a bit. Good excursion.

If i remember correctly i hit the red limiter on the opening scene of oppenheimer. It was a bass note of 25hz and the red lights where on. I could also sense port chuffing. Fair bit of air movement through the ports. I replayed the exact scene to check if the driver was distorting. And No, driver was moving a lot but no distortion. Only the air sound from the ports. Thats the few time i hit the limits of the amps. And on john wick.

Deep bass(20-30hz) was about the same as my previous subs(dual martin logan dynamo 1500x) but above 30hz the punch from these jbls are great.

 

[smygolf]

4645C is an easy load for any amp.
But with B6 your asking a lot, i think it is an combination of signal lvl and B6

 

[g_t_r]

@sahil fardeen - how you applied B6 filter, was such option embedded into xti 1002 options? I also think the same that such EQ like B6 can increase power demand. It is still very strange to kill the pro-amp on 4645C woofer (super efficient) in domestic environment. Or you have great freedom to play super loud