Castle Harlech S2 front top (mid) driver x2 needed!

[chris661]

Originally Posted by system7

People agonise over replacement drivers. Truth is they are all much the same. Seen one 5", you've pretty much seen them all.

Nonesense.
Zaph|Audio

Chris

[dubplate007]

Hi Guys
Castle harlechs seem to be a pain ,i have a pair i wish to restore i have monacor sph 135 c drivers and will replace the vifa tweeter with a seas 27dfc as it crosses over at a low point 1800hz ,lroblem is can anyone help with the crossover section for the midbass? castle have listed the spec as 8 ohms that would mean the original woofers would be 16 ohms as they are wired in parallel configuration ,this wold mean i would have to change the values of the crossover to accommodate the monacor drivers at 4 ohms in parallel any suggestions would be welcome

[EarlK]

Originally Posted by dubplate007

Hi Guys
Castle harlechs seem to be a pain ,i have a pair i wish to restore i have monacor sph 135 c drivers and will replace the vifa tweeter with a seas 27dfc as it crosses over at a low point 1800hz ,lroblem is can anyone help with the crossover section for the midbass? castle have listed the spec as 8 ohms that would mean the original woofers would be 16 ohms as they are wired in parallel configuration ,this wold mean i would have to change the values of the crossover to accommodate the monacor drivers at 4 ohms in parallel any suggestions would be welcome

You'll need to map out the original crossover before anyone can help you out.

Pull a network and follow the signal flow while writing down what connects to what.

As Steve has said, it's unknown whether or not the design is a 2.5 design or a straight 2.0 design.

[dubplate007]

Hi Earlk
Thanks for the reply
it is a 2 way design on the harlechs ,if i am not mistaken the Howards at least the 1 model was a 2.5 way ....i have the crossovers out and the 2nd order mid bass has a 10 uf cap and im sure a 1.50mh inductor though i cannot be sure ...it also has a 7 watt 1ohm resister in line with the or parallel to the 10 uf capacitor

[EarlK]

If you have any of the original midwoofers get a dcr reading from one.

[EarlK]

Is this pic an accurate representation of your Harlech 2 crossover?

[dubplate007]

No Karl they are indeed crossovers for the Harlech s2 unfortunately i have the original poly coned Harlechs i am trying to upload the crossovers bear with me

[dubplate007]

By the way would that crossover work with the monacor units?

[EarlK]

Originally Posted by dubplate007

By the way would that crossover work with the monacor units?

The crossover (seen in the pic that I uploaded ) won't work with the Monacor Mid-Woofs & SEAS tweeter.

For the drivers just mentioned, you'll need an entirely new network.

The SEAS tweeter ( being @ 4 ohms ) & the 2x 8 ohm midwoofers are going to give you a load of @ 4 ohms ( once a network is designed ).

Since the original speaker ( is stated as an 8 ohm load ) it's easy money that the current network will not be of much use ( perhaps a part here + there might be salvaged ).

[dubplate007]

Thought so ,Thanks Karl i will just have to keep plugging away until i find a design that suits both my drivers and the cabinets,should keep me busy for a while