Philips AD-5061 in Back-Loaded Horn

[ARIYAHOOR]

last month I ran into some NOS Philips AD-5061 4Ohm full-range speakers... decided to give them a try... as they are absolute New Old Stock 100 US$/pr seemed pretty a bargain. I managed to build a Back-Loaded Horn for them. Fostex 103-EN plan was the candidate. now project is at completion stage... these new born infants are waiting for painting... I'll post a testing report as soon as I could...

Pictures:

[DrBoar]

Those Philips drivers are really nice, I have the Phillips AD3701M a older version.They have a "musical" sound to them.

If they come out as light in the bass try adding a baffle step correction filter. I did that to my Philipsdrivers in a Voigt pipe and it improved the balance between bass and midrange a lot.

I envy you your big room. My wife does not allow me to have speakers in the living room, she is wearing the pants, what can I say

[ARIYAHOOR]

Originally Posted by DrBoar

Those Philips drivers are really nice, I have the Phillips AD3701M a older version.They have a "musical" sound to them.

If they come out as light in the bass try adding a baffle step correction filter. I did that to my Philipsdrivers in a Voigt pipe and it improved the balance between bass and midrange a lot.

I envy you your big room. My wife does not allow me to have speakers in the living room, she is wearing the pants, what can I say

thanks buddy for reply... and YES they are musical and very efficient as well... (at least 95db/1W because they sound like live with only 1-5 Watt of power)
in this horn configuration the bass is pretty good... I think there is a glimpse of 30hz range... mid is really hoping... highs are very extended... I've listened to Fostex 103-EN and I can chose Philips over 103-EN without battin' an eye

could you please tell me more about "baffle step correction filter"?

[IG81]

Good find on these drivers! I have AD9710 as well as AD7060 from Philips and both are pretty good.

Baffle Step Correction takes care of shelving the midrange and high-frequencies at the point where radiation goes from 4Pi space to 2Pi space and output can raise up to 6dB compared to the bass range.

Loudspeaker Diffraction Loss and Baffle Step Compensation Circuits

Baffle Step Compensation

IG

[DrBoar]

You can take the values I have used (Doctor Boar; DIY loudspeakers and HiFi). It appears that the Zobel filter values are not that critical. The values to use are really a matter of taste as well as an effect of speaker placement for any given construction.

Many two way loudspeakers have the baffle step compensation hidden in the crossover were they use a coil for the bass driver that is at least twise as large as the textbook values for the crossover point.

Then you can really enjoy persian music like Sima Bina with her singing and that ney flute giving that feeling of magic.

[ARIYAHOOR]

Originally Posted by DrBoar

You can take the values I have used (Doctor Boar; DIY loudspeakers and HiFi). It appears that the Zobel filter values are not that critical. The values to use are really a matter of taste as well as an effect of speaker placement for any given construction.

Many two way loudspeakers have the baffle step compensation hidden in the crossover were they use a coil for the bass driver that is at least twise as large as the textbook values for the crossover point.

Then you can really enjoy persian music like Sima Bina with her singing and that ney flute giving that feeling of magic.

Thanks buddy. I'm just amazed about you that know Sima Bina and persian music
I don't have any plan to use baffle step compensation yet... I'll listen for a while and then use it as a change in the sound

[IG81]

A back-loaded horn is typically used to offset the rising response of a driver with a strong motor. Philips drivers, at least most that I know of, have somewhat weaker motors and moderate to high Qts values. There might thus be not too much need for BSC, especially with careful room placement. Experimentation and listening will tell you.

IG

[ARIYAHOOR]

Originally Posted by IG81

A back-loaded horn is typically used to offset the rising response of a driver with a strong motor. Philips drivers, at least most that I know of, have somewhat weaker motors and moderate to high Qts values. There might thus be not too much need for BSC, especially with careful room placement. Experimentation and listening will tell you.

IG

you're right... there is no need to BSC... I tried to attach a ~200hz cutoff tractrix horn in front of the speaker and WOW!! they sound good as hell... We couldn't believe what we heard... the sound field is just HUGE vocals hit us like a ton of brick ... the transparency is just ok, every element of music can be spotted among the sound stage easily... the sound was so smooth... the macro details were so impressive... the coherency was just ok the sound heard very smooth and airy...
although I think this Philips fullrange will sound even better in other enclosures

[IG81]

It might be even better in a big TQTW. I have my 8" AD9710 units in Karlsons right now and they do well enough. I have yet to do anything really serious with the smaller 6" AD7060, save for an aperiodic box that sounded quite good, but was very lean on bass, I could tell this is a nice driver. A TQWT would be good for this one too.

Do you plan on trying another enclosure? Have you measured the T/S parameters? If not you should, it's not that hard.

IG

[ARIYAHOOR]

Originally Posted by IG81

It might be even better in a big TQTW. I have my 8" AD9710 units in Karlsons right now and they do well enough. I have yet to do anything really serious with the smaller 6" AD7060, save for an aperiodic box that sounded quite good, but was very lean on bass, I could tell this is a nice driver. A TQWT would be good for this one too.

Do you plan on trying another enclosure? Have you measured the T/S parameters? If not you should, it's not that hard.

IG

Uh, I'd love to try other enclosures... what do you suggest? TQWT?
about measuring the T/S I don't have a good mic to do so... and I have no idea which microphones I can use... please explain a bit

thanks,