Searching Tweeter for Harbeth M40.1 Clone

[Darakon]

Hi guys,

I would like to build something like the Harbeth M40.1, because everytime I heard it, the sound convinced me.
Harbeth Monitor 40.2 – simply-HIFI.com

At the moment I try to decide, which is the best tweeter to pick.
The M40 has a (custom) seas tweeter with a small waveguide.

The closest might be the seas T25CF001:
SEAS T25CF001 (Tweeter 1", 6 Ohm, 200 Wmax)
So, it has low distortion and the waveguide causes a slight, constant beaming starting at 2 kHz
The specs are good, but not outstanding. The price quite high (here around 125$)

Alternatives I found so far:


Sica 90.28
SICA LP90.28/N92 TW (Tweeter 1.1", 8 Ohm, 120 Wmax)
Similar beaming. a bit higher distortion.
Price around 60$

Wavecor TW030WA10
Wavecor TW030WA10 30mm Textile Dome Tweeter with Curved Faceplate 8 Ohm
bigger size. higher beaming to the hight frequencies. Good distortion.
Extended low range. Around 80$

Wavecor TW022WA06
Wavecor TW022WA06 22mm Textile Dome Tweeter with Ferrofluid
smaller size. Good distortion. Less beaming in the hights. starts beaming at ~3kHz. Extended low range. Price around 60$

Do you have Eperience with any of this tweeters?
Or maybe even compared some of them?

Thank you for your opinion and advice.




Regards!

 

[Lojzek]

You could do better than Harbeth in regard to choosing a more appropriate (smaller diameter) midrange driver. If you would like to "clone" the sound of a 40.1, then you should be aware that this is more a matter of a voicing approach.

 

[system7]

If you buy the Harbeth approach, you buy metal domes:

Soft domes are OK, but a bit Spendor, IMO.

So, IMO, you buy the H1147-06 27TBC/G

Alan Shaw is certainly a speaker genius. Harbeth Loudspeakers Factory Visit - YouTube

So is Joachim Gerhard. He sincerely advises against ferrofluid. Sonics by Joachim Gerhard cabinets and kits.

Three ways aren't rocket science. SEAS-3-Way-Classic

But better than most things.

 

[Darakon]

You could do better than Harbeth in regard to choosing a more appropriate (smaller diameter) midrange driver. If you would like to "clone" the sound of a 40.1, then you should be aware that this is more a matter of a voicing approach.

Hello Lojzek,
yes, good points!
For Midrange at the moment I'm looking for a 6,5" Speaker.
It will not be a 100% clone for sure. I just try to go for an similar concept with a similar target curve (maybe also power response) and a similar housing.


Good evening System7,
good to hear something form UK, the home great classical speakers!

I actually own a pair of the seas 22tff, which are used in the spendor boxes.
I like it a lot and it is currently running in my 'M40'-Concept test.

It works fine. but i crossed it at 2200 Hz, which is actually to low for this driver. But this crossing point gives a better power-responce and sound better in my ears; also there is a little to much power from 2,5 kHz to 4,5 kHz.
Thank you for the interesting links!
Why would you go for Metal? The M40.2 has a 25mm textile with ferrofluid.
Of course, if I could have something better (and cheaper), I would prefer it.

Thanks a lot so far!

 

[system7]

My mistake, my friend. I thought Harbeth always used metal domes along with their in-house radial woofers.

I suppose you can take your pick of any of the 25mm SEAS tweeters. All good. They all go quite low on crossover.

 

[montana1]

Hi Darakon,
You could roll your own in regards to a small waveguide like tweeter. I recently completed a large standmount that was patterned in the Harbeth/BBC approach. The tweeter I used (although one could do better) is the Scanspeak D2604/ 833000 in a Monacor waveguide that was improved by filling the rear cavity with epoxy.

Best,
Rich

 

[Darakon]

Hello,
Harbeth is using actually a lot metal tweeters. Especially for smaler series.
The seas T25 is still a preffered option. But maybe, I could have something similar or better for less money.


Hello Rich,
wow, great work! How do they sound?
Scan-Speak is a good idea. High quality, fair prices.
I will have a look through the scan speak tweeter range.


Thank you guys!

 

[montana1]

Hi Darakon,
They sound very good but I'm still in voicing stage. I sure like the B&C 6NDL38 midrange. It is very nice.

Best Regards,
Rich