Help with fomo - JBL 4645C Subwoofer

[g_t_r]

I have the same bass set up. Jbl 4645c with xls 1502 It rocks my world. Bass are clean, and impacfull. Hard to beat pricewise. But indeed, it's huge. in a domestic environment the spl capacity is basically limitless. It's sooo fun to me. I use it as a home theatre sub as well as a HiFi one. It does booth really good. It can play insanely loud or sweet and detailed . Zero complain about it. It match my jbl 708 perfectly.

Is the bass also deep? Or only loud? Do you use some EQ via this crown amp?

 

[Andysu]

4645 home made and 4645C Eq them down low enough

Sooty and Magic pose

my cat Sooty kitten crawled inside then crawled out though the port

door open or closed changes the low frequency

 

[Rahan]

Is the bass also deep? Or only loud? Do you use some EQ via this crown amp?

I hightpassed it at 20 Hz with the crown as recommended by JBL. I eq with a software for room correction and bass boost. 20 Hz is deep enough for me. I guess you can have deeper with other sub but I don't feel the need personally. The fac that it is loud is great because it can remains clean as you crank the volume up.

 

[Andysu]

You're welcome, glad to share my obsession.
As for 'cleanliness' I can't really say anything other than the 2216ND-1s are super clean in deep bass, the 4645C less so, but is far more 'impactful' in movies - though its really really difficult to tease out the differences. The 4645C does (can) excite building structural resonances at full chat - very very occasionally a movie might do that, but it's rare enough I dont try to 'fix' it, just dial it back a skotch.
The JBL tech notes clearly show the 2269 is significantly cleaner in distortion than the 2242, but - would that even be audible in the sub 100hz reign?
And finding a non-abused 2269 might be a challenge (as a car drives by with woofers so loud it's shaking the ground around my house! as if to make my point.)

we can have x16 4645C for each male

 

[g_t_r]

Hello! Is it possible to connect those typical CROWN cinema amps (i.e. XLS 1502 or dsi1000) somehow to typical stereo system (i.e. some normal integrated amp or power amp) to drive subs? I'm planning to use those JBL 4645c as left and right channel subwoofer (Yeah I know I'm crazy )

 

[Rahan]

With the right power, no problem

 

[g_t_r]

No no, I meant get signal from Power Amp or integrated amp, but still use separate amp(s) to drive the subwoofers.

 

[smygolf]

Long time owner here with two 4645C in a baffle wall.
Subs in parallel driven by a bridged Crown CDi1000, with Dirac on top there is no need to ad a B6 filter.
Sure they cant produce thunders dB below 20hz if that is what you want but down to ~35-30hz they hit Really hard.
And going from floor standing to baffle wall was the best choice ever.

But dont ask them to play the intro on Edge of tomorrow and others at Ref volume or above.
You will not damage them if there is a higpass filter but they will bottom out with a loud Klonk

LCR are diy with 2216ND in a sealed box 140L - also going down to 20hz as long as you dont push them hard.
So music is played without subs and movies with.

 

[smygolf]

Hello! Is it possible to connect those typical CROWN cinema amps (i.e. XLS 1502 or dsi1000) somehow to typical stereo system (i.e. some normal integrated amp or power amp) to drive subs? I'm planning to use those JBL 4645c as left and right channel subwoofer (Yeah I know I'm crazy )

Best would be to have a highpass filter on front and lowpass on subs.
DBX active filter for ex
But you would need more amps and your receiver/integrated amp needs to have pre out.

Totaly missed that you have an amp with dsp for the sub.
But you need highpass on the fronts.

 

[pauldavidthomas]

Hello! Is it possible to connect those typical CROWN cinema amps (i.e. XLS 1502 or dsi1000) somehow to typical stereo system (i.e. some normal integrated amp or power amp) to drive subs? I'm planning to use those JBL 4645c as left and right channel subwoofer (Yeah I know I'm crazy )

When I tried using a XLS 1502 with the JBL 4645c it didn't really sound or drive it correctly. I did have the filters set up correctly.

However, when I used a Crown DSi 2000 it had specific settings ( and as such DSP e/q ) and it sound like a totally different beast - and I mean that in a good way. So, I would recomend the Crown DSi 2000 in bridge mode. I did try the DSi 1000 and found I needed to run the amps about 85% and I don't like doing that. With the DSi 2000 I was running at about 65%. The amp I had was about 12 years old and worked fine.

 

[Rahan]

Xls 1502 would be fine but with a real DSP before. If you don't you won't have much below 30Hz. If I understand you want to use like a high level input you can find on sub power plate. ?

 

[pauldavidthomas]

Xls 1502 would be fine but with a real DSP before. If you don't you won't have much below 30Hz. If I understand you want to use like a high level input you can find on sub power plate. ?

I agree. As long as you know what DSP you should be applying to it. I didn't. So for not too much money I went to the DSi 2000 and let the amp do the work. My processor is a Trinnov, but I don't have the knowledge to config a specific sub correctly. Equally I have Ascendo main speakers. After I had a calibrator come in and tweak the house curves it sounded x10 better. It's an art form that I didn't want to learn.

 

[Audio Science Pal]

... with Dirac on top there is no need to ad a B6 filter.

But dont ask them to play the intro on Edge of tomorrow and others at Ref volume or above... they will bottom out with a loud Klonk

Would be interesting to apply the B6 alignment as recommended by JBL, and compare your subwoofer's performance.

 

[g_t_r]

Okay, so I understand I need to connect the crown amp (here is CDi 1000 model as example - I haven't decided yet which model to buy) to XLR output (or maybe also RCA possible?). My pre (levinson 320s) has only one type of XLR outputs and I'm using them to provide signal to main power amp (for main speakers)... so maybe I should 'steal' the signal from those RCA outputs to the sub using some RCA to XLR converter? Will that work? Isn't possible to take "high level" signal from power amp like in other even cheap home subwoofers to the crown?

 

[smygolf]

Would be interesting to apply the B6 alignment as recommended by JBL, and compare your subwoofer

I did some testing way back and i found it better to let dirac sort it out.
Highpass on subs, red graph, black front speakers

I can let them go to 19hz but i often watch movies at reference lvl and i want them to survive.

Intro edge of tomorrow, mick 1 meter from the baffle wall between the subs.
I let the sweep run for 1/10 of sec then i immediately turned down the volume
Looks fancy but there is like 4000% distortion due to hitting x-mech and it sounded Awful - but they survived
Done with an Umik in high dB setting but i dont really think i was hitting 130dB@20hz - 30hz Yes but not 20

Old Emilar horns on top are not in use, i am to lazy to take them out and fill the holes
The wall has a slight curve hence the strange bend in the pic

 

[g_t_r]

Impressive!!!!! Seems that they can play very low with awesome SPL.

 

[smygolf]

Impressive!!!!! Seems that they can play very low with awesome SPL.

The idea behind it all was to have a musical setup that is fun to listen to.
I was a burnt out high end user, stuck in the wheel going round.
But it should also be able to deliver all the hifi parameters we are chasing.

The first iteration was with JBL 2226 and the emilars with 2" B/C drivers.
Good for movies but not for music, 2226 beams A lot over 500hz

Then i was in a group buy for JBL M2 but it seemed as a waste to have a ported design in movie setup.
I would also have to rebuild the wall, so i dropped the 2216 in current boxes and it works Perfectly.
Wave guide is from JBL PRX with JBL 2453H SL

All in all a Very musical setup that can play loud as Heck

 

[g_t_r]

Have the CROWN amps low "noise floor", I mean - do you hear any hiss coming from the 4645C speaker when you are close to it? Question to crown users how it works in typical home env. not concert hall or cinema.

 

[Rahan]

With a xls1502 bridged, knob two 3 steps from full volume, sensitivity set to 1.4Vrms, feed by a miniDSP flex Htx it's dead silent.
In a domestic environment, it works perfectly. The crowns are in another room in my house but I've never witnessed any fan kicked on.

 

[g_t_r]

Thank you all for help! Finally I bought today single CROWN XLS 2502 to power my 2xJBL 4645c subwoofers. Hopefully this will work fine

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