Low-Cost PMC-inspired TL Monitor with DC130A and DC28F

[xrk971]

On the XO if you personally like more treble or “detail” / “resolution” change R4 from 12R to 10R.

 

[peterasaad]

I think I will use different tweeters
( xt25sc90-04 ) with 24db LR active crossover after that I will use sonarworks for room correction ( for studio monitoring ).

 

[xrk971]

If you are going DSP, give the Harsch XO a try. See how you like it vs LR24.

https://www.diyaudio.com/community/threads/s-harsch-xo.277691/

Benefits are better percussion and snap on drums and string instruments.

 

[peterasaad]

Sure I will give it a try.
Thanks,

 

[peterasaad]

What about using wave guide for time alignment ?

 

[xrk971]

Yes, the WG300 waveguide on my PTT6.5 TL speaker gives enough time delay that I can use a passive Harsch XO for time aligned speaker.

https://www.diyaudio.com/community/...using-ptt6-5-and-rs28f-in-a-waveguide.354778/

XO schematic:

XO curve:

Step Response:

 

[peterasaad]

Excellent results 👍

 

[peterasaad]

do you have the ZMA and FRD files of SB13PFC25-08 ?

 

[Tenson]

I have not read all this thread, but I thought this data might be helpful for you.

This is the PMC AML1 line. Ignore the decimal places, it is probably only accurate to the centimetre. Width of the line is about 165mm. I have some photos somewhere, let me know if wanted.

Somebody also measured the woofer T/S online. I dunno how reliable the data is but this is what they reported.

PMC AML1 Woofer t/s:
Fs: 62,48 Hz
Re: 4.00 ohm (dc)
Le: 0.182 mH
Le2: 0.890 mH
Qt: 0.43
Qes: 0.50
Qms: 2.93
Mms: 36.25 g
Rms: 4.864265 kg/s
Cms: 0.000179 m/N
Vas: 4.43 l
Sd: 132.73 cm²
BL: 10.666486 Tm
Lp(2,83V/1m): 88.29 dB

 

[nicoch58]

Rms: 4.864265 kg/s cannot be good ,that's 21" data

 

[sumeshak]

I have not read all this thread, but I thought this data might be helpful for you.

This is the PMC AML1 line. Ignore the decimal places, it is probably only accurate to the centimetre. Width of the line is about 165mm. I have some photos somewhere, let me know if wanted.

View attachment 1203896

Somebody also measured the woofer T/S online. I dunno how reliable the data is but this is what they reported.

PMC AML1 Woofer t/s:
Fs: 62,48 Hz
Re: 4.00 ohm (dc)
Le: 0.182 mH
Le2: 0.890 mH
Qt: 0.43
Qes: 0.50
Qms: 2.93
Mms: 36.25 g
Rms: 4.864265 kg/s
Cms: 0.000179 m/N
Vas: 4.43 l
Sd: 132.73 cm²
BL: 10.666486 Tm
Lp(2,83V/1m): 88.29 dB

NIce,
Please share more details and photos .
Thank you!

 

[beili]

Greetings from Bulgaria!
I want to ask the author of the thread XRK971 if there is a change in the box of the original drawing at the beginning of the thread.
I will be using these speakers:
https://www.soundimports.eu/en/sb-a...XnnqPtGAynkTLXgTMR_6IbX7VCvhjOMHZMkaAtXbEALw_ w cB
https://www.soundimports.eu/en/sb-acoustics-sb19st-c000-4.html
This is the drawing I had in mind.
I see you used the same speaker but with the square chassis

 

[Mooly]

Please post in English.

Привет от България!
Искам да попитам автора на темата XRK971 има ли промяна в кутията на оригиналния чертеж в началото на темата.
Ще използвам тези високоговорители:
https://www.soundimports.eu/en/sb-a...XnnqPtGAynkTLXgTMR_6IbX7VCvhjOMHZMkaAtXbEALw_ w cB
https://www.soundimports.eu/en/sb-acoustics-sb19st-c000-4.html
Тази рисунка имах предвид.

Hello from Bulgaria!
I want to ask the author of the XRK971 theme if there is a change in the box of the original drawing at the beginning of the topic.
I'll use these speakers:
https://www.soundimports.eu/en/sb-a...XnnqPtGAynkTLXgTMR_6IbX7VCvhjOMHZMkaAtXbEALw_ w cB
https://www.soundimports.eu/en/sb-acoustics-sb19st-c000-4.html
This drawing I meant.

 

[beili]

I'm sorry

 

[Mooly]

No problem I'll tidy it up shortly.

 

[xrk971]

That SB13PFC should work as only difference is round frame. Your 3/4on SBA tweeter looks fine but the passive crossover is going to be all new.

So you will need to develop your own passive crossover from scratch or go active and DSP or active opamp based line level XO.

 

[beili]

I understand that I have to make a new crossover... My question is, do I have to change anything in the enclosure from your drawing. Can you share the midbass crossover?

 

[xrk971]

Cabinet works as shown. No changes. Sorry I can’t share XO for the woofer even. It’s a commercial product.

If you use the DC130A-8 and RST28F the XO is freely available.

 

[beili]

Thank you, I wish everyone health and luck

 

[jmascreen]

This is what I get, I had measured at 1m at middle point between woofer and tweeter.
View attachment 1074844

@xrk971 - I have moved my speakers to a different room now, so thought of revisiting the measurement of the TL with RS180-8/DC28F version of mine.

Getting a huge dip around 40hz due to which the low ends are getting cancelled, seems a room issue any suggestions to fix it?

This is the crossover I did it for them now

Measured response in room